Chemical reactions of metals with acids MCQ — 1 Practice Questions with Answers

Chemical reactions of metals with acids is a Science & Technology topic in the RAS/RPSC syllabus. This page gathers exam-style Chemical reactions of metals with acids multiple-choice questions with correct answers and explanations, so aspirants can test recall and revise frequently examined concepts.

Practice 1 Chemical reactions of metals with acids multiple-choice questions with detailed answers and explanations. Ideal for RAS/RPSC exam preparation.

1 Questions Science & Technology

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Q1. Zinc reacts with dilute nitric acid (aq) to give:

A Zn(NO3)2 + H2O + N2O Correct

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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