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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 colourless gas (B) is:

Answer» <html><body><p>`H_(2)S`<br/>`SO_(2)`<br/>`CO_(2)`<br/>`NO`</p>Solution :`(A) <a href="https://interviewquestions.tuteehub.com/tag/rarr-1175461" style="font-weight:bold;" target="_blank" title="Click to know more about RARR">RARR</a> ZnS, (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) rarr H_(2)S, (C) rarr znSO_(4)` <br/> `H_(2)S +K_(2)Cr_(2)O_(<a href="https://interviewquestions.tuteehub.com/tag/7-332378" style="font-weight:bold;" target="_blank" title="Click to know more about 7">7</a>) rarr underset((D))(Sdarr)+ underset(("Green"))(Cr^(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)<a href="https://interviewquestions.tuteehub.com/tag/darr-943899" style="font-weight:bold;" target="_blank" title="Click to know more about DARR">DARR</a>)`</body></html>


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