Chemistry (General Concepts) MCQs with Answers

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Hydrogen bonds are formed due to intermolecular attraction between a hydrogen atom (bonded to a highly electronegative atom) and a lone pair of electrons on another electronegative atom.

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Mg²⁺ has the highest hydration energy because its small size and high charge (+2) result in a greater charge density, leading to stronger attraction with water molecules.

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Mg²⁺ has the maximum hydration power among the given options due to its high charge density (small size and +2 charge).

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Ortho-xylene is the most easily sulphonated among the three xylene isomers.

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A physical change can be easily reversed because it does not alter the chemical composition of the substance.

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The number of moles of CO₂ containing 16g of oxygen is 0.5.

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Hybrid orbitals have the same energy, meaning they are degenerate.

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Conductivity is a physical property of matter because it can be observed or measured without changing the substance's chemical identity.

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Trichloroacetic acid is the most acidic among the given carboxylic acids because the three electronegative chlorine atoms withdraw electron density, stabilising the conjugate base.

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The rate of a multi-step reaction is determined by the slowest step, which is known as the rate-determining step.