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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. Which of the following statement is correct?

Answer» <html><body><p>The precipitate (D) on burning in air gives a colourless irritating gas.<br/>The gas mentioned in <a href="https://interviewquestions.tuteehub.com/tag/option-25810" style="font-weight:bold;" target="_blank" title="Click to know more about OPTION">OPTION</a> (A) reacts with <a href="https://interviewquestions.tuteehub.com/tag/acidified-1967404" style="font-weight:bold;" target="_blank" title="Click to know more about ACIDIFIED">ACIDIFIED</a> `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>)` producing a greencolouration.<br/>The colourless solution (C) gives bluish-white/white precipitate with excess of potassium ferrocyanide solution<br/>All of the above</p>Solution :`(A) rarr <a href="https://interviewquestions.tuteehub.com/tag/zns-751441" style="font-weight:bold;" target="_blank" title="Click to know more about ZNS">ZNS</a>, (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"))(Cr^(3+))` <br/> `ZnSO_(4)+ NH_(4)OH rarr [Zn(NH_(3))_(4)]^(2+)` <br/> `Zn^(2+) +K_(4)[Fe(CN)_(6)] rarr underset(("White/bluish ppt"))(K_(2)Zn_(3)[Fe(CN)_(6)]_(2)darr)`</body></html>


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