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Chapter 6 Study Of The First Element Hydrogen | Exercise 6D

Question 10

(a) Helium is preferred to hydrogen for filling balloons because it is

(i) lighter than air (ii) almost as light as hydrogen (iii) non-combustible (iv) inflammable

(b) Reacting with water, an active metal produces

(i) oxygen

(ii) nitric acid

(iii) a base

(iv) none of these.

(c) A metal oxide that is reduced by hydrogen is

(i) A12O3

(ii) CuO

(iii) Cao

(iv) Na2O

(d) Which of the following statements about hydrogen is incorrect `?

(i) It is an inflammable

gas

(ii) It is the lightest gas.

(iii) It is not easily liquefied.

(iv) It is a strong oxidizing agent.

(e) For the reaction PbO + H2 → Pb + H2O, which of the following statements is wrong?

i) H2 is the reducing agent. (ii) PbO is the oxidizing agent. (iii) PbO is oxidized to Pb (iv) H2 is oxidized to

H2O.

f) Which metal gives hydrogen with all of the following: water, acids, alkalis?

(i) Fe

(ii) Zn

(iii) Mg

(iv) Pb

(g) Which of the following metals does not give hydrogen with acids?

(i) Iron (ii) Copper

(iii) Magnesium (iv) Zinc

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a. non-combustible

b. base

c. CuO

d. It is a strong oxidizing agent.

e. (iii) PbO is oxidized to Pb.

f. (ii) Zn

g. (ii) Cu

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Question 10

(a) Helium is preferred to hydrogen for filling balloons because it is

(i) lighter than air (ii) almost as light as hydrogen (iii) non-combustible (iv) inflammable

(b) Reacting with water, an active metal produces

(i) oxygen

(ii) nitric acid

(iii) a base

(iv) none of these.

(c) A metal oxide that is reduced by hydrogen is

(i) A12O3

(ii) CuO

(iii) Cao

(iv) Na2O

(d) Which of the following statements about hydrogen is incorrect `?

(i) It is an inflammable

gas

(ii) It is the lightest gas.

(iii) It is not easily liquefied.

(iv) It is a strong oxidizing agent.

(e) For the reaction PbO + H2 → Pb + H2O, which of the following statements is wrong?

i) H2 is the reducing agent. (ii) PbO is the oxidizing agent. (iii) PbO is oxidized to Pb (iv) H2 is oxidized to

H2O.

f) Which metal gives hydrogen with all of the following: water, acids, alkalis?

(i) Fe

(ii) Zn

(iii) Mg

(iv) Pb

(g) Which of the following metals does not give hydrogen with acids?

(i) Iron (ii) Copper

(iii) Magnesium (iv) Zinc

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a. non-combustible

b. base

c. CuO

d. It is a strong oxidizing agent.

e. (iii) PbO is oxidized to Pb.

f. (ii) Zn

g. (ii) Cu

Our top 5% students will be awarded a special scholarship to Lido.

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