NEET Sample Paper NEET Sample Test Paper-14

  • question_answer 60) Sodium chloride, NaCI, usually crystallizes in a face- centred cubic lattice. How many ions are in contact with any single \[\text{N}{{\text{a}}^{\text{+}}}\]ion?

    A)  4                    

    B)  6

    C)  8                    

    D)  1

    Correct Answer: B

    Solution :

    Since Nad has a fee structure, therefore each \[N{{a}^{+}}\]ion is surrounded by six \[\text{C}{{\text{l}}^{-}}\]ions at the corners of a regular octahedron and similarly each \[\text{C}{{\text{l}}^{-}}\]ion is surrounded by six Nations. It is therefore, termed as a 6 : 6 arrangement. Hence, the correct option is [b].

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