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    Question

    For the Assertion (A) and Reason (R) below, choose the

    correct alternative: Assertion (A): When common salt is kept open, it absorbs moisture from the air. Reason (R): Common salt contains magnesium chloride.
    A Both (A) and (R) are true and (R) is the correct explanation of (A) Correct Answer Incorrect Answer
    B Both (A) and (R) are true but (R) is NOT the correct explanation of (A) Correct Answer Incorrect Answer
    C (A) is true but (R) is false Correct Answer Incorrect Answer
    D (A) is false but (R) is true Correct Answer Incorrect Answer

    Solution

    Assertion (A): "When common salt is kept open, it absorbs moisture from the air."
    This is true.
    Commercial common salt absorbs moisture from the air because of the presence of impurities that are hygroscopic (absorb water). Reason (R): "Common salt contains magnesium chloride."
    This is also true.
    While pure sodium chloride (NaCl) is not hygroscopic, magnesium chloride (MgCl ₂ ) — often present as an impurity in common salt — is hygroscopic.  

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