Assertion : The complex `K_(3) [Cr(C_(2)O_(4))_(3)]` when present in aqueous solution , will give test for `K^(+)` , `Cr^(3+)` and oxalate ions .
Reason : The complex `K_(3) [Cr(C_(2)O_(4))_(3)]` will dissociate completely in solution .

Options

A. If both Assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. if both assertion and reason are false

Answer

D

Explanation

`K_(3)[Cr(C_(2)O_(4))_(3)]` is a complex and will dissociate in solution in the following way :
`K_(3)[Cr(C_(2)O_(4))_(3)] to 3 K^(+) + underset("Complex ion")([Cr(C_(2)O_(4))_(3)]^(3-)`
Complex ion `[Cr(C_(2)O_(4))_(3)]^(3-)` does not dissociate into `Cr^(3+)` and `C_(2)O_(4)^(2-)` ions . Hence , it will not give test for these ion .