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NDA Chemical Reactions questions with solutions

Reaction types, redox, electrolysis and equilibrium. 12 questions from our 2016–2025 NDA pattern papers, from the Class 10 Science syllabus. Each has the answer and a full solution.

NDA 2025

In the reaction CuO + H2 gives Cu + H2O, the substance that acts as the oxidising agent isNDA 2025 GAT · hard

NDA 2023

In the Haber process, N2 + 3H2 ⇌ 2NH3 (exothermic), the yield of ammonia at equilibrium is increased byNDA 2023 GAT · hard

NDA 2022

The reaction CaO + H2O gives Ca(OH)2 is an example of aNDA 2022 GAT · easy
The oxidation state of sulphur in sulphuric acid, H2SO4, isNDA 2022 GAT · hard

NDA 2021

The oxidation state of manganese in potassium permanganate (KMnO4) isNDA 2021 GAT · hard

NDA 2020

Electrolysis of an aqueous solution of sodium chloride (brine) producesNDA 2020 GAT · medium
Pure distilled water is a good conductor of electricity. 2. Dissolving common salt in water makes it conduct electricity.NDA 2020 GAT · easy
The oxidation state of chromium in potassium dichromate, K2Cr2O7, isNDA 2020 GAT · medium

NDA 2018

When a zinc rod is placed in copper sulphate solution, the blue colour fades and a reddish-brown deposit forms. The reaction is an example ofNDA 2018 GAT · medium

NDA 2017

Which one of the following is a chemical change?NDA 2017 GAT · medium
Electrolysis of water: 1. Hydrogen and oxygen are obtained in the volume ratio 2 : 1. 2. Hydrogen gas is collected at the anode.NDA 2017 GAT · medium

NDA 2016

Rusting of iron is a physical change. 2. Burning of a magnesium ribbon in air is a physical change.NDA 2016 GAT · medium

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