Chemistry (General Concepts) MCQs with Answers

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Water is a polar solvent due to the unequal sharing of electrons between oxygen and hydrogen atoms, creating a partial negative charge on oxygen and partial positive charges on hydrogen.

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Isotonic solutions have the same molar concentration (osmotic concentration) across a semipermeable membrane.

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NH3 (ammonia) is a Lewis base because it donates a lone pair of electrons.

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The spectrum of electromagnetic radiation emitted when an atom or molecule transitions from a higher to a lower energy state is called the emission spectrum.

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BF₃ (Boron trifluoride) is an electron deficient molecule because boron has only 6 electrons in its valence shell, making it an exception to the octet rule.

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<strong>Sodium</strong> is NOT an oxidizing agent; it is a strong reducing agent because it readily loses electrons.

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S₈ is not a covalent network crystal; it exists as discrete S₈ ring molecules held together by weak van der Waals forces, making it a molecular crystal.

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A solution containing a solid solute dissolved in a liquid solvent is called a solid in liquid solution.

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Dissolving sugar in water is a physical change, not a chemical change, because no new substance is formed and the process is reversible.

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A solution that cannot dissolve any more solute at a given temperature is called a Saturated Solution.