Chemical Reaction & Equations (Objectives)

 

 

Q.11. Name the products formed when iron filings are heated with dilute hydrochloric acid
(a) Fe (III) chloride and water
(b) Fe (II) chloride and water
(c) Fe (II) chloride and hydrogen gas
(d) Fe (III) chloride and hydrogen gas

Answer

Answer: d
Explanation: 2Fe + 6HCl → 2FeCl₃ (Iron (III) chloride) + 3H₂

Q.12.  The electrolytic decomposition of water gives H₂ and O₂ in the ratio of     
(a)  1 : 2 by volume
(b)  2 : 1 by volume
(c)  8 : 1 by mass
(d)  1 : 2 by mass

Answer

Answer: b

Q.13. 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

Answer

Answer: b

Q.14.  In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is     
(a)  1
(b)  2
(c)  3
(d)  4

Answer

Answer: d

Q.15. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
(a) antioxidation
(b) reduction
(c) rancidity
(d) corrosion

Answer

Answer: c

Q.16.  Fatty foods become rancid due to the process of     
(a)  oxidation
(b)  corrosion
(c)  reduction
(d)  hydrogenation

Answer

Answer: a

Q.17. A substance added to food containing fats and oils is called:
(a) Oxidant
(b) Rancid
(c) Coolant
(d) Antioxidant

Answer

Answer: d

Q.18.  We store silver chloride in a dark coloured bottle because it is     
(a)  a white solid
(b)  undergoes redoc reaction     
(c)  to avoid action by sunlight
(d)  none of the above

Answer

Answer: c

Q.19. Select the oxidising agent for the following reaction:
H₂S + I₂ → 2HI + S
(a) I₂
(b) H₂S
(C) HI
(d) S

Answer

Answer: a

Q.20.  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

Answer

Answer: d