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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Topic Test - Solid State

  • question_answer
    When heated above \[916{}^\circ C,\] iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio of the density of the crystal before heating and after heating is:

    A) 1.069

    B) 0.918

    C) 0.725

    D) 1.231

    Correct Answer: B

    Solution :

    [b] \[{{\rho }_{1}}=\frac{2\times 56}{{{\left( 4r/\sqrt{3} \right)}^{3}}};{{\rho }_{2}}=\frac{4\times 56}{{{\left( 2\sqrt{2r} \right)}^{3}}}\] \[\frac{{{\rho }_{1}}}{{{\rho }_{2}}}=0.918\]   


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