In the test of sulphate radical,the white precipitate of sulphate is soluble in

  • A
    Conc. $HCl$
  • B
    Conc. $H_2SO_4$
  • C
    Conc. $HNO_3$
  • D
    None of these

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$[X] + H_2SO_4 \rightarrow [Y]$ (a colorless gas with a pungent smell). $[Y] + K_2Cr_2O_7 + H_2SO_4 \rightarrow$ green solution. What are $[X]$ and $[Y]$?

The gas evolved when sodium sulfide is heated with dilute $HCl$ is:

$AgNO_3$ gives a red precipitate with:

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An anion solution gives a white precipitate with $AgNO_3$ solution. The precipitate dissolves in dilute ammonia due to the formation of:

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