Chemical Equations and Reactions

The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction

• (i) and (iv)
• (ii) and (iii)
• (i) and (iii)
• (iii) and (iv)

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)

• (i) and (ii)
• (ii) and (iii)
• (i) and (iv)
• (iii) and (iv)

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride

• (a) (i) only
• (i) and (iii)
• (c) (ii) and (iii)
• (d) (iv) only

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction

• (a) (i) only
• (b) (ii) only
• (c) (iv) only
• (d) (ii) and (iv)

Which one of the following processes involve chemical reactions?

• 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

Rancidity is a process in which fat/oils smell due to the change process of

• oxidation

• reduction

• displacement

• neutralization

Colour of which metal changes to greem due to corrosion?

• Cu

• Al

• Fe

• Ag

Which of the following statements about the given reaction are correct?

3Fe_(s) + 4H₂O_(g) ® Fe₃O_4(s) + 4H_2(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

• (a) (i), (ii) and (iii)

• (b) (iii) and (iv)

• (c) (i), (ii) and (iv)

• (d) (ii) and (iv)

Which among the following is(are) double displacement

reaction(s)?

(i) Pb + CuCl₂ --> PbCl₂ + Cu

(ii) Na₂SO₄ + BaCl₂ --> BaSO₄ + 2NaCl

(iii) C + O₂ --> CO₂

(iv) CH₄ + 2O₂ --> CO₂ + 2H₂O

• (a) (i) and (iv)

• (b) (ii) only

• (c) (i) and (ii)

• (d) (iii) and (iv)

The following reaction is used for the preparation of oxygen gas in the laboratory

2KClO₃ (s) + Heat --Catalyst--> 2KCl (s) + 3O₂ (g)

Which of the following statement(s) is(are) correct about the reaction?

• (a) It is a decomposition reaction and endothermic in nature

• (b) It is a combination reaction

• (c) It is a decomposition reaction and accompanied by release of heat

• (d) It is a photochemical decomposition reaction and exothermic in nature