Select the incorrect statement.

Options

A. Marsh's test involves the reduction of soluble arsenic compound to arsine by nascent hydrogen in acidic solution and its subsequent decomposition into hydrogen and metallic arsenic as a brownish-black mirror on heating in a glass tube mixed with hydrogen.
B. Ammonical silver nitrate gives metallic silver mirror with saturated solution of hydrazine sulphate
C. Red precipitate of silver (I) chromate is soluble in dilute nitric acid and ammonia solution.
D. None of the above

Answer

D

Explanation

(b) `4[Ag(NH_(3))_(2)]^(+) +H_(2)N-NH_(2).H_(2)SO_(4) rarr underset(("Silver mirror"))(4Agdarr+N_(2)uarr) +6NH_(4)^(+)+2NH_(3)+SO_(4)^(2-)`
(a) `AsO_(4)^(3-) +4Zn +11H^(+) rarr AsH_(3)uarr +4Zn^(2+)+4H_(2)O 4AsH_(3) overset(Delta)rarr 4Asdarr +6H_(2)uarr`