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NDA Carbon and Organic Chemistry questions with solutions

Carbon compounds, hydrocarbons, polymers and fuels. 22 questions from our 2017–2025 NDA pattern papers, from the Class 10 Science syllabus. Each has the answer and a full solution.

NDA 2025

Best conductor of electricity?NDA 2025 GAT · medium
The process of converting an ester into soap by heating with sodium hydroxide is calledNDA 2025 GAT · medium

NDA 2024

Ethanol: 1. It can be obtained by the fermentation of sugars. 2. It is a saturated hydrocarbon.NDA 2024 GAT · medium

NDA 2023

The gas commonly used for cutting and welding metals along with oxygen isNDA 2023 GAT · easy
The number of sigma (σ) bonds in a molecule of ethene (C2H4) isNDA 2023 GAT · hard
Soaps are sodium or potassium salts of long-chain fatty acids. 2. Soaps work well in hard water because they form soluble calcium salts.NDA 2023 GAT · medium
A strong-smelling compound, ethanethiol, is added to LPG cylinders mainly toNDA 2023 GAT · easy

NDA 2022

The functional group present in alcohols isNDA 2022 GAT · medium
Diamond is a good conductor of electricity. 2. Graphite is used as a dry lubricant.NDA 2022 GAT · medium
Ethanoic acid is the main constituent ofNDA 2022 GAT · easy

NDA 2021

The chief constituent of compressed natural gas (CNG) isNDA 2021 GAT · easy
A saturated hydrocarbon?NDA 2021 GAT · easy

NDA 2020

An alkyne contains five carbon atoms. The number of hydrogen atoms in one molecule isNDA 2020 GAT · medium

NDA 2019

Graphite, unlike diamond, conducts electricity becauseNDA 2019 GAT · medium
A strong-smelling compound is added to LPG cylinders so that a leakage can be detected. This compound isNDA 2019 GAT · easy
In the vulcanisation of natural rubber, rubber is heated withNDA 2019 GAT · easy

NDA 2018

The number of structural isomers of butane (C4H10) isNDA 2018 GAT · medium
When carbon dioxide is passed in excess through lime water, the milkiness first formed disappears becauseNDA 2018 GAT · hard
The type of hybridisation of the carbon atoms in ethene (C2H4) isNDA 2018 GAT · hard

NDA 2017

Which allotrope of carbon is a good conductor of electricity?NDA 2017 GAT · easy
The number of sigma and pi bonds in an ethyne (acetylene) molecule are respectivelyNDA 2017 GAT · hard
The IUPAC name of the compound CH3-CH2-CH2-OH isNDA 2017 GAT · medium

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