Assertion: Basic radical of V group are precipitated as their carbonates in presence of `NH_(4)OH`.
Reason: `NH_(4)OH` maintains the pH of the solution basic.

Options

A. STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is correct explanation for STATEMENT-1
B. STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is not correct explanation for STATEMENT-2
C. STATEMENT-1 is true, STATEMENT-2 is false
D. STATEMENT-1 is false, STATEMENT-2 is true

Answer

B

Explanation

Statement-1 :In the presence of `NH_(4)^(+)` salts, no precipitation of `Mg^(2+)` occurs because the equilibrium
`NH_(4)^(+) + CO_(3)^(2-) hArr NH_(3) +HCO_(3)^(-)` is shifted towards the formation of `HCO_(3)^(-)` ions. `K_(sp)` of the precipitate being high (`K_(sp)` of pure `MgCO_(3)` is `1xx10^(-5)`), the concentration of carbonate ions necessary to produce a precipitate is not attained.
Statement-2 :`NH_(4)OH` turns red litmus blue.`NH_(4)OH hArr NH_(4)^(+) +OH^(-)`