A white substance (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and a colourless solution (C). The reaction between (B) and acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly coloured precipitate (D). Addition of aqueous ammonia or sodium hydroxide to (C) produces first a precipitate, which dissolves in the excess of teh respective reagent to produce a clear solution in each case. The metal cation of the white substance (A) is:

A white substance (A) reacts with dilute H_(2)SO_(4) to produce a colo

1.	A white substance (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and a colourless solution (C). The reaction between (B) and acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly coloured precipitate (D). Addition of aqueous ammonia or sodium hydroxide to (C) produces first a precipitate, which dissolves in the excess of teh respective reagent to produce a clear solution in each case. The metal cation of the white substance (A) is:
Answer» <html><body><p>`AI^(3+)`<br/>`Cd^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>+)`<br/>`Zn^(2+)`<br/>`Pb^(2+)`</p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :`(A) rarr ZnS, (B) rarr H_(2)S, (C) rarr znSO_(4)` <br/> `H_(2)S +K_(2)Cr_(2)O_(7) rarr underset((D))(Sdarr)+ underset(("Green"))(<a href="https://interviewquestions.tuteehub.com/tag/cr-427229" style="font-weight:bold;" target="_blank" title="Click to know more about CR">CR</a>^(3+))` <br/> `ZnSO_(4)+ NH_(4)OH rarr [Zn(NH_(3))_(4)]^(2+)` <br/> `Zn^(2+) +K_(4)[Fe(CN)_(<a href="https://interviewquestions.tuteehub.com/tag/6-327005" style="font-weight:bold;" target="_blank" title="Click to know more about 6">6</a>)] rarr underset(("White/bluish ppt"))(K_(2)Zn_(3)[Fe(CN)_(6)]_(2)darr)`</body></html>