Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

The INCORRECT statement is:

  1. A

    The spin-only magnetic moments of [Fe(H2O)6]2+ and [Cr(H2O)6]2+ are nearly similar.

  2. B

    The gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl. 

  3. C

    The spin-only magnetic moment of [Ni(NH3)4(H2O)2]2+ is 2.83 BM.

  4. D

    The color of [CoCl(NH3)5]2+ is violet as it absorbs the yellow light.

Solution

Ruby is aluminium oxide (Al2O3) containing about 0.5 – 1% Cr3+ ions which are randomly distributed in the position normally occupied by Al3+ ions.

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