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0% SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS APP Questions will be picked at random from the question bank.You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.Goodluck! 1 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following statements about ideal gases is/are correct?I. The cohesive forces between their particles are negligiblell. The have no definite volume but occupy the volume of their containersIII. They are not compressibleIV. Their particles collide with loss of energy l and ll only l, ll, lll, and IV l only l, ll and lll only 2 / 80 Category: CHEMISTRY PAST QUESTIONS What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Destructive distillation Redox reaction Nutralization Dehydration 3 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following contains co-ordinate covalent bond? Na+CI HCI NH4 CH4 4 / 80 Category: CHEMISTRY PAST QUESTIONS One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] 122 53 40 101 5 / 80 Category: CHEMISTRY PAST QUESTIONS What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1 lonization energy Dissociation energy Electron affinity Heat of atomization 6 / 80 Category: CHEMISTRY PAST QUESTIONS An exothermic reaction is one which involves loss of heat to the surrounding positive change in value of enthalpy attainment of dynamic equilibrium evolution of gas as it proceeds 7 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following lowers the activation energy of a chemical reaction? Freezing mixture Catalyst Reducing agent Water 8 / 80 Category: CHEMISTRY PAST QUESTIONS Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible? Q + S+ → S + Q+ S + Q+ → Q + S+ R + P+ → P + R+ S + P+ → P + S + 9 / 80 Category: CHEMISTRY PAST QUESTIONS What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O Hydrogen Oxygen Copper Nitrogen 10 / 80 Category: CHEMISTRY PAST QUESTIONS What is the shape of a molecule of CCI4? Linear Pyramidal Trigonal planar Tetrahedral 11 / 80 Category: CHEMISTRY PAST QUESTIONS Helium is preferred to hydrogen in filling balloons because hydrogen is diatomic is a component of water is inflammable exhibits isotopy 12 / 80 Category: CHEMISTRY PAST QUESTIONS Dehydration of ethanol produces propan-1,2,3-triol ethene ethanal ethanoic acid 13 / 80 Category: CHEMISTRY PAST QUESTIONS The spontaneity of a chemical reaction is determined by the change in the pressure applied to the system concentration of the reactants free energy of the system temperature of the system 14 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that a solid is formed and heat is evolved activation energy is high and a catalyst is required direct combination is involved and the reaction is endothermic the reaction is endothermic and occurs at high temperature 15 / 80 Category: CHEMISTRY PAST QUESTIONS A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods? H+ Cu2+ OH- CI- 16 / 80 Category: CHEMISTRY PAST QUESTIONS Equal volumes of CO2 cnd CO at s.t.p have the same mass density number of molecules rate of diffusion 17 / 80 Category: CHEMISTRY PAST QUESTIONS A finely divided from of a metal burns more readily in air than the rod from because the rod has protective oxide coating smaller surface area different chemical properties higher molar mass 18 / 80 Category: CHEMISTRY PAST QUESTIONS Gas molecules are said to be perfectly elastic because they move about in straight lines the volume occupied by them is negligible they collide without loss of energy the distances between them are negligible 19 / 80 Category: CHEMISTRY PAST QUESTIONS P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of Graham's law Boyle's law Gay-Lussac's Law Dalton's law 20 / 80 Category: CHEMISTRY PAST QUESTIONS Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore S decays faster than Q Q emits fewer particles than S S is more stable than Q Q is twice as stable as S 21 / 80 Category: CHEMISTRY PAST QUESTIONS In the Periodic Table, the elements that loss electrons most readily belong to Group 111 A Group 11 A Group 1 A Group V11 A 22 / 80 Category: CHEMISTRY PAST QUESTIONS Pipe-borne water is usually chlorinated in order to coagulate sediments in the water improve the teste of the water kill harmful bacteria in the water remove the hardness in the water clear 23 / 80 Category: CHEMISTRY PAST QUESTIONS Metals are said to be malleable because they can be beaten into sheets are good conductors heat are good conductors of electricity can be alloyed 24 / 80 Category: CHEMISTRY PAST QUESTIONS What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g) Activation energy will decrease the reaction will go to completion the forward reaction will be favoured the concentration of ammonia will increase 25 / 80 Category: CHEMISTRY PAST QUESTIONS What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1 Reduces the time for attainment of equilibrium Shifts equilibrium position to the right Decreases the value of ∆H Increases the collision rate of reactant particles 26 / 80 Category: CHEMISTRY PAST QUESTIONS The presence of unpaired electrons in an atom of a transition metal gives rise to paramagnetism shiny appearance nalleability ductility 27 / 80 Category: CHEMISTRY PAST QUESTIONS Pauli Exclusion Principle is related to quantum numbers of electrons reversiblility of equlibrium reactions electronegativity values of elements collision theory of reaction rates 28 / 80 Category: CHEMISTRY PAST QUESTIONS A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by sublimation filtration distillation evaporation 29 / 80 Category: CHEMISTRY PAST QUESTIONS The crystal layers in graphite are held together by electrostatic forces covalent bonds van der Waals' forces hydrogen bonds 30 / 80 Category: CHEMISTRY PAST QUESTIONS When alkanols react with sodium, the ga evolved is ethyne oxygen methane hydrogen 31 / 80 Category: CHEMISTRY PAST QUESTIONS The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive? R Q T S 32 / 80 Category: CHEMISTRY PAST QUESTIONS Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of emission diffusion combustion absorption 33 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following movements can be described as random motion? wheelbarrow being pushed planets going round the sun car travelling on a straight line gas molecules colliding in a flask 34 / 80 Category: CHEMISTRY PAST QUESTIONS Rusting of iron is an example of redox reaction decomposition deliquescence displacement reaction 35 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following properties increases down a group in the Periodic Table? Electon affinity Electronegativity Ionization energy Atomic radius 36 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to form a solution with pH below 7? Potassium hydroxide Ammonium chloride Sodium trioxocarbonate (IV) Sodium tetraoxosulphate (VI) 37 / 80 Category: CHEMISTRY PAST QUESTIONS What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] 0.040dm 3 5.82dm 3 0.896dm 3 8.62dm 3 38 / 80 Category: CHEMISTRY PAST QUESTIONS 0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI contains more ions has a lower molar mass has a higher pH is neutral to litmus 39 / 80 Category: CHEMISTRY PAST QUESTIONS What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O 1 12 6 8 40 / 80 Category: CHEMISTRY PAST QUESTIONS What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l) Bleaching agent Acid Oxidising agent Dehydrating agent 41 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following features of a human skeleton can be determined by carbon-dating? Age Mass Height Race 42 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following increases as boiling water changes to steam? temperature of the system number of molecules degree of disorder in the system activation energy 43 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will displace copper from a solution of copper (ll) salt? Magnesium Aluminium ions Zinc ions Silver 44 / 80 Category: CHEMISTRY PAST QUESTIONS Elements which belong to the same group in the Periodic Table are characterized by presence of the same number of outermost electrons in the respective atoms difference of 14 atomic mass units between successive members difference of +1 in the oxidation numbers of successive members presence of the same number of electron shells in the respective atoms 45 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following is not correct about oxidation number convention? The oxidation number of a/an monatomic ion is equal to its charge element in the free state is zero alkali meta like sodium in its compounds is + 1 atom of a diatomic molecules is + 2 46 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following non-metals reacts most readily with metals? Nitrogen Chlorine Sulphur Carbon 47 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as a catalysty is intoduced into the system the pressure increased the temperature is raised the volume of the system is increased 48 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4p 4f 4s 4d 49 / 80 Category: CHEMISTRY PAST QUESTIONS Chlorine atom forms CI by Donating lone pair of electrons Losing one electron Gaining one electron Sharing one electron 50 / 80 Category: CHEMISTRY PAST QUESTIONS Chemical equilibrium is attained when concentrations of the reactants and products remain constant reactants in the system are used up reactants stop forming the products concentrations of the products are greater than those of the reactants 51 / 80 Category: CHEMISTRY PAST QUESTIONS What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C] 6.35g 0.318g 18g 0.635g 52 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to give an alkaline solution? Ammonium chloride Sulphur (IV) oxide Potassium oxide Sodium chloride 53 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following methods is suitable for the preparation of an insoluble salt? Double decomposition Action of an acid on a metal Neutralisation Action of an acid on a trioxocarbonate (IV) 54 / 80 Category: CHEMISTRY PAST QUESTIONS The liquid product of the destructive distillation of coal is paraffin oil ethanol ammoniacal liquor kerosene 55 / 80 Category: CHEMISTRY PAST QUESTIONS 30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction 35cm cube 30cm cube 50cm cube 25cm cube 56 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following substances decomposes when an electric current is passed through it? Tetrachlormethane Zinc rod Hydrochloric acid Glucose solution 57 / 80 Category: CHEMISTRY PAST QUESTIONS It can be concluded that gastric juice is a mixture contains enzymes is acidic has pH value of 7 58 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution? Copper turnings Copper (ll) oxide Copper alloy Copper (ll) trioxocarbonate (IV) 59 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes? Both electrodes gain electrons The cathode becomes coated with copper The anode increases in mass The blue colour of the solution fades gradually 60 / 80 Category: CHEMISTRY PAST QUESTIONS Elactrostatic force of attraction between sodium ion and halide ion is greatest in NaCI NaF NaBr NaI 61 / 80 Category: CHEMISTRY PAST QUESTIONS Aluminium is extracted from bauxite cassiterite cryolite magnetite 62 / 80 Category: CHEMISTRY PAST QUESTIONS If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly metallic dative ionic covalent 63 / 80 Category: CHEMISTRY PAST QUESTIONS Electrovalent compounds are characterized by high melting point solubility in ethanol high molar mass strong oxidizing ability 64 / 80 Category: CHEMISTRY PAST QUESTIONS A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of beta particles and gamma rays alpha particles only alpha particles and gamma rays alpha and beta particles 65 / 80 Category: CHEMISTRY PAST QUESTIONS A radioactive solid is best stored in a box lined with lead under ultraviolet light under paraffin oil in a cool, dark cupboard 66 / 80 Category: CHEMISTRY PAST QUESTIONS The type of chemical bond that exists between potassium and oxygen in potassium oxide is dative metallic covalent ionic 67 / 80 Category: CHEMISTRY PAST QUESTIONS What is responsible for metallic bonding? transfer of electrons from one atom to another Attraction between positive and negative ions Attraction between the atomic unclei and cloud of electrons Sharing of electrons between the metal atoms 68 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following pairs of reagents recat to produce hydrogen? Zinc and concentrated trioxonitrate (V) acid Copper and dilute hydrochloric acid Water and calcium dicarbide Magnesium and dilute tetraoxosulphate (VI) acid 69 / 80 Category: CHEMISTRY PAST QUESTIONS If the solubility of KHCO3 is 0.40 mole dm-3 4.0g 10.0g 100.0g 40.0g 70 / 80 Category: CHEMISTRY PAST QUESTIONS Calcium atom ionizes by sharing two electrons gaining two electrons gaining two protons losing two electrons 71 / 80 Category: CHEMISTRY PAST QUESTIONS How many electrons are removed from Cr2- when it is oxidized to CrO42-? 4 8 0 2 72 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following can undergo both addition reactions and substitution reactions? Propene Hexane Benzene Pentane 73 / 80 Category: CHEMISTRY PAST QUESTIONS A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct? At equilibrium increase in temperature favours the reverse reaction The forward reaction is exthermic The reaction goes to completion at equilibrium Pressure has no effect on the equilibrium mixture 74 / 80 Category: CHEMISTRY PAST QUESTIONS The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is oxygen hydrogen carbon (IV) oxide sulphur (VI) oxide 75 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? The cathode becomes coated with copper The anode increases in mass Both electrodes gain electrons The blue colour of the solution fades gradually 76 / 80 Category: CHEMISTRY PAST QUESTIONS What is the oxidation number of nitrogen in AI(NO3)3? + 1 + 5 + 6 + 3 77 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode? Glucose solution Dilute sodium chloride solution Concentrated hydrochloric acid Aqueous copper (ll) tetraoxosulphate (IV) 78 / 80 Category: CHEMISTRY PAST QUESTIONS The property of calcium chloride which makes it useful as a drying agent is that it is a strong electrolyte deliquescent ionic a normal salt 79 / 80 Category: CHEMISTRY PAST QUESTIONS Substances which absorb water from the atmosphere without dissolving in it are said to be insolube hydrated anhydrous hygroscopic 80 / 80 Category: CHEMISTRY PAST QUESTIONS Petrol consists mainly of polymers alktanols hydrocarbons alkanoates Your score is 0% Restart quiz
SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)
CHEMISTRY PAST QUESTIONS APP
Questions will be picked at random from the question bank.
You can use the NEXT button to move to the next question, use the PREVÂ button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.
Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.
Goodluck!
1 / 80
Category: CHEMISTRY PAST QUESTIONS
Which of the following statements about ideal gases is/are correct?
I. The cohesive forces between their particles are negligible
ll. The have no definite volume but occupy the volume of their containers
III. They are not compressible
IV. Their particles collide with loss of energy
2 / 80
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
3 / 80
Which of the following contains co-ordinate covalent bond?
4 / 80
One mole of a compound M(HCO3)2Â has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
5 / 80
What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1
6 / 80
An exothermic reaction is one which involves
7 / 80
Which of the following lowers the activation energy of a chemical reaction?
8 / 80
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
9 / 80
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
10 / 80
What is the shape of a molecule of CCI4?
11 / 80
Helium is preferred to hydrogen in filling balloons because hydrogen
12 / 80
Dehydration of ethanol produces
13 / 80
The spontaneity of a chemical reaction is determined by the change in the
14 / 80
Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that
15 / 80
A concentrated solution containing H+, Cu2+,OH-Â and CI-Â was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
16 / 80
Equal volumes of CO2Â cnd CO at s.t.p have the same
17 / 80
A finely divided from of a metal burns more readily in air than the rod from because the rod has
18 / 80
Gas molecules are said to be perfectly elastic because
19 / 80
P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of
20 / 80
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
21 / 80
In the Periodic Table, the elements that loss electrons most readily belong to
22 / 80
Pipe-borne water is usually chlorinated in order to
23 / 80
Metals are said to be malleable because they
24 / 80
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g)Â N2(g)Â + 3H2(g)
25 / 80
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1
26 / 80
The presence of unpaired electrons in an atom of a transition metal gives rise to
27 / 80
Pauli Exclusion Principle is related to
28 / 80
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
29 / 80
The crystal layers in graphite are held together by
30 / 80
When alkanols react with sodium, the ga evolved is
31 / 80
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
32 / 80
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
33 / 80
Which of the following movements can be described as random motion?
34 / 80
Rusting of iron is an example of
35 / 80
Which of the following properties increases down a group in the Periodic Table?
36 / 80
Which of the following compounds dissolves in water to form a solution with pH below 7?
37 / 80
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
38 / 80
0.10 mol dm-3Â NaCI conducts electricity better than 0.10 mol dm-3Â CH3COOH because the solution of NaCI
39 / 80
What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
40 / 80
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
41 / 80
Which of the following features of a human skeleton can be determined by carbon-dating?
42 / 80
Which of the following increases as boiling water changes to steam?
43 / 80
Which of the following will displace copper from a solution of copper (ll) salt?
44 / 80
Elements which belong to the same group in the Periodic Table are characterized by
45 / 80
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
46 / 80
Which of the following non-metals reacts most readily with metals?
47 / 80
Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
48 / 80
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
49 / 80
Chlorine atom forms CI by
50 / 80
Chemical equilibrium is attained when
51 / 80
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
52 / 80
Which of the following compounds dissolves in water to give an alkaline solution?
53 / 80
Which of the following methods is suitable for the preparation of an insoluble salt?
54 / 80
The liquid product of the destructive distillation of coal is
55 / 80
30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
56 / 80
Which of the following substances decomposes when an electric current is passed through it?
57 / 80
It can be concluded that gastric juice
58 / 80
Which of the following would dissolve in warm dilute H2SO4Â without effervescence, to give a blue solution?
59 / 80
Which of the following occurs when a solution of CuSO4Â is electrolysed using copper electrodes?
60 / 80
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
61 / 80
Aluminium is extracted from
62 / 80
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
63 / 80
Electrovalent compounds are characterized by
64 / 80
A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
65 / 80
A radioactive solid is best stored
66 / 80
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
67 / 80
What is responsible for metallic bonding?
68 / 80
Which of the following pairs of reagents recat to produce hydrogen?
69 / 80
If the solubility of KHCO3Â is 0.40 mole dm-3
70 / 80
Calcium atom ionizes by
71 / 80
How many electrons are removed from Cr2-Â when it is oxidized to CrO42-?
72 / 80
Which of the following can undergo both addition reactions and substitution reactions?
73 / 80
A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?
74 / 80
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
75 / 80
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
76 / 80
What is the oxidation number of nitrogen in AI(NO3)3?
77 / 80
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
78 / 80
The property of calcium chloride which makes it useful as a drying agent is that it is
79 / 80
Substances which absorb water from the atmosphere without dissolving in it are said to be
80 / 80
Petrol consists mainly of
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