NEET AIPMT SOLVED PAPER 2000

  • question_answer
                    A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the comers of a cube and B atoms are at the face centres. The formula of die compound is:                

    A)                 \[A & {{ & }_{2}}{{B}_{2}}\]

    B)                 \[A{{B}_{3}}\]

    C)                         AB           

    D)                 \[{{A}_{3}}B\]

    Correct Answer: B

    Solution :

                    A atoms are at corners of a cube                 So, the number of A atoms per unit cell                 \[=8\times \frac{1}{8}=1\].                 Similarly, B atoms are present at face centres of a cube.                 So, the number of S atoms per unit cell \[=6\times \frac{1}{2}=\]                 Hence, the compound is \[A{{B}_{3}}\]


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