1.

Assertion : In high spin situation, configurationofd^5ions will be t_(2g)^3e_g^2 Reason : In high spin situation pairing energy is less than crystal field energy.

Answer»

if both assertion and reason are true and reason is thr correct explanationof assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reson are false.

Solution :
`THEREFORE` In HIGH spin situation ` Delta_0 lt P ` , in `d^s ` configuration `4^th` and `5^th` elctronare added to ` e_g ` rather than `t_2g1`So configuration of ` d^5` ION will be `t_(2G)^3 e_g^2 `


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