1. Tardigrade
  2. Question
  3. Chemistry
  4. Select the correct statements from the following. (1) For tetragonal crystal, a=b=c and α=β=γ=90° (2) For CsCl the radius ratio is between 0.732-1.0 (3) In CaF2, the Coordination of Ca 2+ and F - are 4 and 8 respectively. (4) The maximum coordination number of an atom in a HCP crystal structure of an element is 12.

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Q. Select the correct statements from the following.
(1) For tetragonal crystal, $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$
(2) For $CsCl$ the radius ratio is between $0.732-1.0$
(3) In $CaF_{2}$, the Coordination of $Ca ^{2+}$ and $F ^{-}$ are 4 and 8 respectively.
(4) The maximum coordination number of an atom in a HCP crystal structure of an element is 12.

The Solid State

Solution:

(1) For tetragonal crystal $a=b \neq c ; \alpha=\beta=\gamma=90^{\circ}$

(2) For $CsCl$ , the Coordination No. is $8 $ and for this $C.N,$.

radius ratio is between $0.732-1.00$.

(3) In $CaF_2$ , the Coordination number of $Ca ^{2+}=8$ and $F -=4$ respectively.

(4) The maximum $C.N$ is $12$ for $ HCP $ crystal structure.