First slide

Crystal field theory

Question

Statement 1: ${CuSO}_{4} . 5 H_{2} O$ on heating to $250^{o} C$ loses all the five $H_{2} O$ molecules and becomes anhydrous.
Statement 2: All five $H_{2} O$ molecules are coordinated to the central ${Cu}^{2 +}$ ion.

Easy

A

Both statements 1 and 2 are correct
B

Statement 1 is correct statement 2 is incorrect
C

Statement 1 is incorrect statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

Statement 1: ${CuSO}_{4} . 5 H_{2} O (blue) \overset{250^{o} C}{\to} {CuSO}_{4} (white) + 5 H_{2} O ↑$ . Anhydrous copper sulphate becomes white because there is no d-d transition of electron in absence of ligands according to crystal field theory.
Statement 2: Four water molecules are coordinated to ${Cu}^{2 +}$ and fifth one is hydrogen bonded to two water molecules and anion, ${SO}_{4}^{2 -}$ .

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