Assertion : The complex `K_3 [Cr(C_2O_4)_3]` when present in aqueous solution, will give test for `K^(+), Cr^(3+)` and oxalate ions.
Reason : The complex `K_3[Cr(C_2O_4)_3]` will dissociate completely in solution.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but(R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

D

Explanation

`K_3[Cr(C_2O_4)_3]` is a complex and will dissociate in solution in the following way:
`K_3[Cr(C_2O_4)_3] to 3K^(+) + underset("Complexion")([Cr(C_2O_4)_3]^(3-))`
Complex ion `[Cr(C_2O_4)_3]^(3-)` does not dissociate into `Cr^(3+)` and `C_2O_4^(2-)`ions. Hence, it will not give test for these ions.