Pure $HNO_3$ is a colorless liquid,but it turns light brown in the presence of light. This is due to its decomposition into which of the following substances in small amounts?

  • A
    $NO, NO_2$
  • B
    $NO_2, O_2$
  • C
    $NO, O_2$
  • D
    $N_2O_5, O_2$

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Pure $N_2$ gas is prepared by:

White phosphorus,when heated with conc. $NaOH$ solution in an inert atmosphere of $CO_2$,forms phosphine and a sodium salt of oxoacid of phosphorus,$'X'$. The oxidation state of phosphorus in $'X'$ is

White phosphorus reacts with thionyl chloride to give

$NH_3 + O_2 \xrightarrow[\Delta]{Pt} A + H_2O$ ;
$A + O_2 \to B$ ;
$B + O_2 + H_2O \to C$
$A, B$ and $C$ are:

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How does the acidity of pentoxides vary down the $VA$ group?

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