Select correct statement(s).

Options

A. `PH_(3)` reduce `AgNO_(3)` to metallic Ag
B. Organic tissues turn `AgNO_(3)` black by reducing it to `Ag`
C. `AgCN` is soluble in `KCN.`
D. `Zr` and `Ta` have almost similar size due to lanthanide contraction

Answer

ABC

Explanation

(A) `PH_(3)+6AgNO_(3)+3H_(2)Oto6Ag+6HNO_(3)+H_(3)PO_(3)`
(B ) It possessses powerful corrosive action action on organic tissue, which it turn black especially in presence of light. The blackening is due to finely divided metallic silver,reduced by organic tissue.
(C ) `AgCN(s)+CN(-) (aq) to [Ag(CN)_(2)]^(-) ("soluble complex")`. (D) `Zr` is the element of the `4d` series `4^(th)` group while Ta is a element of `5d` series `5^(th) ` group so have differ atomic sizes.