Some Chemical Reactions MCQs with Answers

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Hydrogen sulphide (H₂S) reacts with sulphur dioxide (SO₂) to produce sulphur (S) and water (H₂O).

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Leaves changing colors in the fall is an example of a chemical reaction because it involves the breakdown of chlorophyll and formation of new pigments.

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In the Cannizzaro reaction, no new carbon-carbon bond is formed; it involves the disproportionation of aldehydes lacking alpha-hydrogens into an alcohol and a carboxylic acid.

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Rose petals turn from red to blue in an alkaline solution due to the presence of anthocyanin pigments that change color with pH.

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The reaction of calcium hydroxide with chlorine gas produces bleaching powder (CaOCl₂) and water (H₂O).

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Ketone does not give a positive Tollen's test; however, the question is flawed because ketones give a positive 2,4-DNP test but a negative Tollen's test, unlike aldehydes which give positive results for both.

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Catalytic hydrogenation of benzene yields cyclohexane (C₆H₁₂), a saturated cyclic hydrocarbon.

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The process by which one glycerol molecule is linked with three fatty acids via esterification is known as Acylglycerol.

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Acetic acid can be prepared by the hydrolysis of methyl cyanide (also known as acetonitrile).

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Hypochlorous acid (HClO) is unstable and readily liberates atomic oxygen, which makes it a powerful oxidizing and bleaching agent.