Q 1 – What is the colour and formula of Sodium Sulphate?
(a) Colourless Na2SO4
(b) White Na2SO4
(c) Colourless NaSO4
(d) White Na(SO4)2
(a) Colourless Na2SO4
Q 2 – In the balanced equation: a. Fe2O3 + b. H2 → c. Fe + d. H2O
The value of a, b, c, d are respectively –
(A) 1, 1, 2, 3
(B) 1, 1, 1, 1
(C) 1, 3, 2, 3
(D) 1, 2, 2, 3
(C) 1, 3, 2, 3
Q 3 – A balanced chemical equation always obeys
a. Law of conservation of mass
b. Law of thermal equilibrium
c. Law of conservation of energy
d. All of the above
(a) law of conservation of mass.
Q 4 – During respiration, glucose and oxygen combine in the cells of our body when energy is released.
What is the best way to describe the reaction that takes place during the process of respiration?
(a) Oxidation
(b) Endothermic
(c) Exothermic
(d) Displacement
(c) Exothermic
Q 5. Which of the following is a thermal decomposition reaction?
(a) 2H2O → 2H2 + O2
(b) 2AgCl → 2Ag + Cl2
(c) H2(g) + Cl2(g) → 2HCl(g)
(d) ZnCO3 → ZnO + CO2
(d) ZnCO3 → ZnO + CO2
Q 6 Single displacement reaction involves
a. Oxidation
b. Reduction
c. Redox
d. Heating
(c) redox
Q 7 – What becomes the colour of iron nails after they have been kept in the blue solution of copper sulfate for about 20 minutes?
(a) White
(b) Reddish-brown
(c) Green
(d) Blue
(b) Reddish-brown
Q 8 – A red-brown gas is released on heating lead nitrate. It is an example of
a. Combination reaction
b. Oxidation reaction
c. Decomposition reaction
d. Reduction reaction
(c) Decomposition
Q 9 – Barium chloride and sodium sulphate react to produce –
(a) BaSO4 & NaCl
(b) Ba2SO4 & NaCl
(c) BaSO4 & Na2Cl
(d) None of these.
(a) BaSO4
Q 10 – The action of water on quick lime is an example of which type of reaction?
(a) Combination
(b) Displacement
(c) Decomposition
(d) Redox
(a) Combination
Q 11 – The sign ↓ indicates
a. release of gas
b. dissolution of gas
c. formation of a precipitated. lowering of temperature
(c) formation of a precipitate
Q 12 – The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
(a) Decomposition Reaction
(b) Displacement Reaction
(c) Double Displacement Reaction
(d) Neutralisation Reaction
(c) Double Displacement Reaction
Q 13 – What is the nature of the new product which is formed by the action of water on quick lime?
(a) Neutral
(b) Acidic
(c) Amphoteric
(d) Basic
(c) Amphoteric
Q 14 – When lead nitrate reacts with potassium iodide, a yellow precipitate of
(A) PbI2 is formed
(B) KNO3 is formed
(C) Pb(NO3)2 is formed
(D) PbIO3 is formed
(A) PbI2 is formed
Q 15 – When ferrous sulphate is heated the following reaction takes place: 2FeSO4 (s) ——–> Fe2O3 (s) + SO2 (g) + SO3 (g)
The above reaction is called __________ of ferrous sulphate.
(a) Thermal Displacement
(b) Combination
(c) Thermal Decomposition
(d) Double displacement
(c) Thermal Decomposition
Q 16 – Which of the following is a displacement reaction?
(A) CaO + H2O → Ca(OH)2
(B) MgCO3 → MgO + CO2
(C) 2Na + 2H2O → 2NaOH + H2
(D) H2 + Cl2 → 2HCl
(C) 2Na + 2H2O → 2NaOH + H2
Q 17 – Which of the following is a displacement reaction?
(A) CaO + H2O → Ca(OH)2
(B) MgCO3 → MgO + CO2
(C) 2Na + 2H2O → 2NaOH + H2
(D) H2 + Cl2 → 2HCl
(b) Orange to green
Q 18 – What is the colour of solid ferrous sulphate?
(a) Blue
(b) Red
(c) Light green
(d) Light yellow
(c) Light green
Q 19 – Fatty foods become rancid due to the process of
(a) oxidation
(b) corrosion
(c) reduction
(d) hydrogenation
(a) oxidation
Q 20 – Which one of the following metals can displace copper from copper sulphate solution?
(a) Zn
(b) Ag
(c) Au
(d) None
(a) Zn
Q 21 – What is the colour of the solution of copper sulphate?
(a) Green
(b) Light green
(c) Blue
(d) Pink
(c) Blue
Q 22 – Which type of reaction takes place when an iron nail is dipped in a solution of copper sulphate?
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
(b) Displacement
(b) –10xyz2 , 3xyz2
Q 23 – Which one is the correct statement about the reaction?
Fe(s) + CuSO4(aq) —-> FeSO4(aq) + Cu(s)
(a) Iron is more reactive than copper
(b) Iron is less reactive than copper
(c) In this reaction Cu2+ is oxidized and Fe is reduced
(d) Copper is more reactive than iron
(a) Iron is more reactive than copper
Q 24 – What is the colour of the aqueous solution of sodium sulphate?
(a) Blue
(b) Green
(c) Colourless
(d) Purple
(c) Colourless
Q 25 – Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as a precipitation reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
Q 25 – Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as a precipitation reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
(b) Both A and R are true but R is not the correct explanation of A.
Q 26 – What is the colour of the aqueous solution of Barium chloride?
(a) Blue
(b) Green
(c) Colourless
(d) Purple
(c) Colourless
Q 27 – What is the colour of the precipitate which is formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Yellow
(b) White
(c) Green
(d) Orange
(b) White
Q 28 – Name the precipitate formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Barium sulphate
(b) Sodium sulphate
(c) Barium hydroxide
(d) Barium sulphate
(d) Barium sulphate
Q 29 – Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)
(a) (i) and (ii)
Q 30 – What is the type of reaction between sodium sulphate and barium chloride?
(a) Decomposition
(b) Direct combination
(c) Single displacement
(d) Double displacement
(d) Double displacemen
Q 31 – Heating ferrous sulphate is an example of which type of reaction?
(a) Thermal decomposition
(b) Thermal analysis
(c) Double decomposition
(d) Catalytic decomposition
(d) Double displacement
Q 32 – The reaction of acetylene and hydrogen in presence of heated nickel powder is called:
(a) Substitution
(b) Dissociation
(c) Addition
(d) Decomposition
(c) Addition
Q 33 – Which one is a double displacement reaction?
(a) BaCl2 + Na2SO4 ——–> BaSO4 + 2NaCl
(b) CaO + H2O ————> Ca(OH)2
(c) 2Pb(NO3)2 ——–> 2PbO + 4NO2 + O2
(d) Zn + 2AgNO3 ———-> Zn(NO3)2 + 2Ag
(a) BaCl2 + Na2SO4 ——–> BaSO4 + 2NaCl
Q 34 – Silver article turns black when kept in the open for a few days due to formation of
a) H2S
b) AgS
c) AgSO4
d) Ag2S
d) Ag2S
Q 35 – What type of reaction is respiration
(a) Exothermic
(b) Endothermic
(c) Reduction reaction
(d) Combination reaction
(a) Exothermic
Q 36 – The heating of ferrous sulphate is an example of __________ reaction and the reaction between iron and copper sulphate is an example of __________ reaction.
(a) displacement, decomposition
(b) decomposition, displacement
(c) combination, displacement
(d) combination, decomposition
(b) decomposition, displacement
Q 37 – What happens when dilute Sulphuric acid is added to Zn granules?
(a) Hydrogen gas and Zinc chloride are produced.
(b) Chlorine gas and Zinc hydroxide are produced.
(c) No reaction takes place.
(d) Zinc salt and water are produced
(a) Hydrogen gas and Zinc chloride are produced.
Q 38 – In the reaction, 2H2S + SO2 → 3S + 2H2O
(A) H2S has been oxidized
(B) SO has been oxidized
(C) H2S is the oxidizing agent
(D) SO2 is the reducing agent
(A) H2S has been oxidized
Q 39 – Both CO2 and H2 gases are
(A) Heavier than air
(B) Colourless
(C) Acidic in nature
(D) Soluble in water
(B) Colourless
Q 40. Which of the following reactions will not take place?
(a) Zn + CuSO4 → ZnSO3 + Cu
(b) 2KBr + Cl2 →KCI+ Br2
(c) Zn + MgSO4 → ZnSO4 + Mg
(d) Mg + FeSO4 – MgSO4 + Fe
(c) Zn + MgSO4 → ZnSO4 + Mg
Q 41 – Following is the reactivity series in decreasing order of their reactivity –Magnesium > Zinc > Iron > Lead > Copper > Silver > Gold
Which one of the following metals can displace copper from copper sulphate solution?
(a) Zn
(b) Ag
(c) Au
(d) None
(a) Zn
Q 42 – CuSO4 + Zn → Cu + ZnSO4 This reaction is an example of a:
a. Combination reaction.
b. Double displacement reaction.
c. Decomposition reaction.
d. Displacement reaction.
d. Displacement reaction.
Q 43 – A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the
identification?
(a) Blue litmus
(b) Red litmus
(c) Sodium carbonate solution
(d) Dilute hydrochloric acid
(b) Red litmus
Q 44. In an electrolytic cell where electrolysis is carried, the anode has:
(a) Positive change
(b) Negative charge
(c) Connected to the negative terminal of the battery
(d) None of these is correct
(a) Positive change
Q 45 – Translate the following statements into chemical equations and then balance them.
Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
a. BaCl2 + Al2 (SO4)3 → AlCl3 + BaSO4
b. 3BaCl2 + Al2 (SO4) 3 →2 AlCl3 +3BaSO4
c. BaCl2 + AlSO4 → AlCl2 + BaSO4
d. BaCl3 + Al(SO4) 3 → AlCl3 + Ba(SO4) 3
b. 3BaCl2 + Al2 (SO4) 3 →2 AlCl3 + 3BaSO4
Q 46 – Identify the type of reaction in each case.
Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
a. Combination, Decomposition
b. Double displacement, Combination
c. Decomposition, Combination
d. Displacement, Decomposition
c. Decomposition, Combination
Q 47 – The balancing of chemical equations is in accordance with:
a. Law of combining volumes
b. Law of constant proportions
c. Law of conservation of mass
d. Both b and c
d. Both b and c
Q 48 – The substitution is characteristic of:
(a) Alkenes
(b) Alkynes
(c) Carbon monoxide
(d) Paraffins
(d) Paraffins
Q 49 – The substitution is characteristic of:
(a) Alkenes
(b) Alkynes
(c) Carbon monoxide
(d) Paraffins
(b) Like burning sulphur
Q 50 – What is the colour of the residue left in the test tube after thermal decomposition of ferrous sulphate?
(a) White
(b) Black
(c) Green
(d) Yellowish-brown
(d) Yellowish-brown
Q 51 – On immersing an iron nail in CuSO4 solution for few minutes, you will observe
(a) no reaction takes place
(b) the colour of the solution fades away
(c) the surface of iron nails acquire a black coating
(d) the colour of the solution changes to green
(d) the colour of solution changes to green
Q 52 – In the equation, a Al + bH2SO4 → c Al2 (SO4)3 + dH2 a, b, c, d are respectively –
(A) 2, 3, 1, 1
(B) 2, 3, 1, 3
(C) 2, 3, 2, 3
(D) 2, 2, 3, 3
(B) 2, 3, 1, 3
Q 53 – Which of the given gases can be used for the storage of fresh samples of oil for a long time?
(A) Carbon dioxide or oxygen
(B) Nitrogen or helium
(C) Helium or oxygen
(D) Nitrogen or oxygen
(b) Nitrogen or helium
Q 54 – Rancidity can be prevented by
(A) adding antioxidants
(B) packaging oily food in nitrogen gas
(C) both A and B
(D) none of these
(C) both A and B
Q 55 – When dilute hydrochloric acid is added to zinc pieces taken in a test tube
(A) no change takes place
(B) the colour of the solution becomes yellow
(C) a pungent-smelling gas gets liberated
(D) small bubbles of hydrogen gas appear on the surface of zinc pieces
(D) small bubbles of hydrogen gas appear on the surface of zinc pieces
Q 56 – In which of the following, heat energy will be evolved?
(a) Electrolysis of water
(b) Dissolution of NH4Cl in water
(c) Burning of L.P.G.
(d) Decomposition of AgBr in the presence of sunlight
(c) Burning of L.P.G.
Q 57 – In the reaction
Values of x, y and z respectively are
(A) 1, 1, 2
(B) 2, 2, 4
(C) 1, 2, 4
(D) 4, 2, 2
(B) 2, 2, 4
Q 58 – In the balanced equation Na2CO3 + xHCl → 2NaCl + CO2 + H2O. The value of x is
(A) 1
(B) 2
(C) 3
(D) 4
(B) 2
Q 59 – Which of the following statement is incorrect?
(A) In oxidation, oxygen is added to a substance
(B) In reduction, hydrogen is added to a substance.
(C) Oxidizing agent is oxidized
(D) Reducing agent is oxidized
(C) Oxidizing agent is oxidized
Q 60 – Plastic bags containing potato chips are filled with an antioxidant, known as
(A) oxygen
(B) nitrogen
(C) hydrogen
(D) carbon monoxide
(B) nitrogen
Assertion and Reasoning
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Q 61. Assertion (A): Decomposition of vegetable matter into compost is an example of exothermic reactions.
Reason (R): Exothermic reactions are those reactions in which heat is evolved.
(a) Both A and R are true and R is the correct explanation of A.
Q 62. Assertion (A): White silver chloride turns grey in sunlight.
Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.
(a) Both A and R are true and R is the correct explanation of A.
Q 63. Assertion (A): In the electrolysis of water, the volume of hydrogen liberated is twice the volume of oxygen formed.
Reason (R): Water (H,0) has hydrogen and oxygen in the ratio of 1:2 by volume.
(c) A is true but R is false.
Q 64. Assertion (A): Iron articles are painted so as to prevent them from rusting.
Reason (R): When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.
(a) Both A and R are true and R is the correct explanation of A.
Q 65. Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason (R): Zinc reacts with oxygen to form zinc oxide
(b) Both A and R are true but R is not the correct explanation of A
Q 66. Assertion (A): Rusting of iron metal is the most common form of corrosion.
Reason (R): The effect of rusting of iron can be reversed if they are left open in sunlight.
(c) A is true but R is false.
Q 67. Assertion (A): A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason (R): Lead nitrate reacts with potassium iodide to form yellow ppt. of lead iodide and the reaction is double displacement as well as a precipitation reaction.
(b) Both A and R are true but R is not the correct explanation of A
Q 68. Assertion: The colour of copper sulphate does not change when an iron nail is kept in it.
Reason: Iron is more reactive than copper and it displaces it.
(d) A is false but R is true..
Q 69. Assertion: Nitrogen is flushed in potato chip packets to preserve the acidity of potato
chips.
Reason: Nitrogen prevents contact of chips to air and thus prevents oxidation.
(d) A is false but R is true.
Q 70. Assertion: Calcium carbonate on heating breaks into Calcium Oxide and Cabon dioxide gas.
Reason: Calcium carbonate is a base.
(b) Both A and R are true but R is not the correct explanation of A.
Q 71. Assertion: Combustion reactions are also called exothermic oxidation reactions.
Reason: In these reactions, oxygen is added and heat energy is released.
(a) Both A and R are true and R is the correct explanation of A.
Q 72. What happens when dilute hydrochloric acid is added to iron filling? Tick the correct answer
(a) Hydrogen gas and iron chloride are produced.
(b) Chlorine gas and iron hydroxide are produced
(c) No reaction takes place
(d) Iron salt and water are produced
(a) Hydrogen gas and iron chloride are produced.
Q 73. Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as a precipitation reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
(b) Both A and R are true but R is not the correct explanation of A.
Q 74. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
(a) Decomposition Reaction
(b) Displacement Reaction
(c) Double Displacement Reaction
(d) Neutralisation Reaction
(c) Double Displacement Reaction
Q 75. The condition produced by aerial oxidation of fats and oils in foods marked by an unpleasant smell and taste is called:
(a) Antioxidation
(b) Reduction
(c) Rancidity
(d) Corrosion
(c) Rancidity
Q 76. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of
(a) Decomposition Reaction
(b) Displacement Reaction
(c) Double Displacement Reaction
(d) Neutralisation Reaction
(c) Double Displacement Reaction
Q 77. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
(a) 1:1
(b) 2:1
(c) 4:1
(d) 1:2
(b) 2:1
Q 78. What type of chemical reactions take place when electricity is passed through water?
(a) Displacement
(b) Combination
(c) Decomposition
(d) Double displacement
(c) Decomposition
Q 79. Which of the following is an endothermic process?
(a) Dilution of sulphuric acid
(b) Sublimation of dry ice
(c) Condensation of water vapours
(d) Respiration in human beings
(b) Sublimation of dry ice
Q 80. Oxidation is a process that involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen
(a) addition of oxygen
Q 81. Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
(a) 1:2
Q 82. A substance that oxidizes itself and reduces others is known as
(a) Oxidising agent
(b) reducing agent
(c) Both (a) and (b)
(d) None of these.
(b) reducing agent
Q 83. In an electrolytic cell where electrolysis is carried, the anode has:
(a) Positive change
(b) Negative charge
(c) Connected to the negative terminal of the battery
(d) None of these is correct
(a) Positive change
Q84. In an electrolytic cell where electrolysis is carried, the anode has:
(a) Positive change
(b) Negative charge
(c) Connected to the negative terminal of the battery
(d) None of these is correct
(a) Positive change
Q 85. Which of the following reactions is not correct:
(a) Zn+ CuSO4 → ZnSO4 + Cu
(b) 2Ag + Cu(NO3)2 → 2AgNO3 + Cu
(c) Fe+CuSO4 → FeSO4 + Cu
(d) Mg + 2HCl → MgCl2 + H2
(b) 2Ag + Cu(NO3)2 → 2AgNO3 + Cu
Q 86. Copper displaces which of the following metals from its salt solution:
(a) ZnSO4
(b) FeSO4
(c) AgNO3
(d) NISO4
(c) AgNO3
Q 87. Which of the following involves a combination of two elements?
(a) N2(g) + 3H2(g) + 2NH3(g)
(b) CaO(s) + CO2(g) → CaCO3(g)
(c) 2SO2(g) + O2(g) → 2SO3f(g)
(d) NH3(g) + HCl(g) – NH4CI(S)
(a) N2(g) + 3H2(g) + 2NH3(g)
Q 88. Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained
would be:
(a) green
(b) red
(c) blue
(d) brown
(c) blue
Q 89. When dilute HCl is added to zinc pieces taken in a test tube
(a) No change takes place
(b) the colour of the solution becomes yellow.
(c) A pungent-smelling gas gets liberated.
(d) small bubbles of H2 gas appear on the surface of zinc pieces
(d) small bubbles of H2 gas appear on the surface of zinc pieces.
Q 90. Magnesium ribbon is rubbed before burning because it has a coating of:
(a) basic magnesium oxide
(b) basic magnesium carbonate
(c) basic magnesium sulphide
(d) basic magnesium chloride
(b) basic magnesium carbonate
Q 91. Which one of the following processes involves chemical reactions?
(a) Storing of oxygen gas under pressure in a gas cylinder
(b) Liquefaction of air
(c) Keeping petrol in a china dish in the open
(d) Heating copper wire in presence of air at high temperature
(d) Heating copper wire in presence of air at high temperature
Q 92. Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason: Zinc reacts with oxygen to form zinc oxide.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
(b) Both A and R are true but R is not the correct explanation of A.
Q 93. Assertion: MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O is redox reaction.
Reason: MnO2 oxides HCl to Cl2 and gets reduced to MnCl2.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
(a) Both A and R are true and R is the correct explanation of A..
Q 94. Assertion: Magnesium ribbon keeps on burning in an atmosphere of nitrogen.
Reason: Magnesium reacts with nitrogen to form magnesium nitrides and this reaction is a combination reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
(a) Both A and R are true and R is the correct explanation of A.
Q 95. Heat is evolved during:
(a) Endothermic Reaction
(b) Displacement Reaction
(c) Combustion Reaction
(d) Combination Reaction
(c) Combustion Reaction
Q 96. Dissolving suger is an example of
(a) Physical change
(b) Chemical change
(c) Redox Reaction
(d) None of these
(a) Physical change
Q 97. A substance added to food containing fats and oils is called:
(a) Oxidant
(b) Rancid
(c) Coolant
(d) Antioxidant
(d) Antioxidant
Q 98. Select the oxidising agent for the following reaction:
H2S + I2 > 2HI + S
(a) I2
(b) H2S
(C) HI
(d) S
(a) I2
Q 99. A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of
air. Identify ‘X’.
(a) CaOCl2
(b) Ca (OH)2
(c) CaO
(d) CaCO3
Lor(b) Ca (OH)2
Q 100. The process of reduction involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen
(b) addition of hydrogen