Chemistry (General Concepts) MCQs with Answers

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Metallic oxides are called bases because they react with acids to form salts and water.

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The number of sulphur atoms in 64 g of S8 is 2NA.

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10 moles of H₂O contains 100 moles of electrons because each water molecule has 10 electrons (8 from oxygen + 2 from two hydrogen atoms).

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Among the given options, Rb⁺ has the largest ionic radius because ionic radius increases down a group in the periodic table.

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The longest period of the periodic table is Period 6th, which contains 32 elements.

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Among the hydrogen halides, HI has the greatest acidic strength because its large atomic radius results in the weakest H–I bond, making proton donation easiest.

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NH₃ (ammonia) is not an electrophile; it is a nucleophile because it has a lone pair of electrons to donate.

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The general formula for alkenes is CnH2n.

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An ionic bond is formed by the electron transfer from one atom to another, resulting in oppositely charged ions that attract each other.

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The smallest particle of any substance that retains all the properties of that substance is called a molecule.