Some Chemical Reactions MCQs with Answers

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When SHE is connected with Cu electrode, Cu⁺² reduces at the copper electrode.

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Gun powder (black powder) is composed of three key ingredients: sulphur, charcoal, and potassium nitrate (saltpetre).

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Sucrose is converted into glucose and fructose by the enzyme invertase (also known as sucrase).

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The reaction is 2nd order because the rate increases by a factor of 4 (2²) when concentration is doubled.

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Bayer's test is used for the detection of carbon-carbon double bonds in alkenes, where cold dilute alkaline KMnO₄ decolorizes in the presence of unsaturation.

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Mustard gas is a high boiling liquid at room temperature, not an actual gas despite its name.

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The half-life period of a first-order reaction depends upon temperature because the rate constant changes with temperature, while it is independent of the initial concentration of the reactant.

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The pH of a mixture of CH₃COONa and CH₃COOH is <7 because it forms an acidic buffer solution.

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The pH of 1 molar KOH is 14 because it is a strong base that completely dissociates in water.

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Phenolphthalein indicator turns pink in a basic (alkaline) medium.