MCQ

Chemical reactions of metals MCQ - Practice Questions with Answers

Solve 3 Chemical reactions of metals questions for RAS/RPSC preparation.

Practice questions

Q1Concentrated nitric acid (aq) reacts with copper to give:

A Copper nitrate and hydrogen gas

B Copper nitrate, nitrogen monoxide and water

C Copper nitrate, nitrogen dioxide and water

D Copper oxide and dinitrogen oxide

Explanation

Copper reacts with concentrated aqueous nitric acid in a redox reaction. Copper is oxidised to copper nitrate, while concentrated nitric acid is reduced mainly to nitrogen dioxide, a brown gas, and water is also formed. Hydrogen gas is not released because nitric acid is a strong oxidising acid, unlike dilute non-oxidising acids. Nitrogen monoxide is the usual product with dilute nitric acid, not concentrated nitric acid. Copper oxide and dinitrogen oxide do not represent the standard reaction products for copper with concentrated nitric acid.

Q2What is formed in the reaction of sodium hydroxide with zinc?

A Zinc hydroxide and hydrogen gas

B Zinc hydroxide and sodium

C Sodium zincate and hydrogen gas

D Sodium zincate and water

Explanation

Zinc is an amphoteric metal, so it reacts with a strong base such as sodium hydroxide to form sodium zincate and hydrogen gas. The reaction shows zinc dissolving in alkali while hydrogen is released. Zinc hydroxide with hydrogen gas is not the final product named in this alkaline reaction. Zinc hydroxide with sodium is chemically unsuitable because sodium metal is not liberated. Sodium zincate with water misses the characteristic evolution of hydrogen gas, which is the key product alongside sodium zincate.

Q3Zinc reacts with dilute nitric acid (aq) to give:

A Zn(NO3)2 + H2O + N2O

B Zn(NO3)2 + H2

C Zn(NO3) + H2O + NO2

D Zn(NO3)2 + NO + H2O

Explanation

Nitric acid is a strong oxidising acid, so zinc does not normally liberate hydrogen from it. With hot dilute nitric acid, zinc nitrate, water and nitrous oxide are formed: 4Zn + 10HNO3 → 4Zn(NO3)2 + N2O + 5H2O. The formula with hydrogen gas is wrong because nitric acid oxidises nascent hydrogen. The product containing NO2 corresponds more to concentrated nitric acid, while NO is associated with some dilute-acid reactions of other metals.

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