The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two $P-H$ bonds,is

  • A
    Phosphonic acid
  • B
    Phosphinic acid
  • C
    Pyrophosphorus acid
  • D
    Hypophosphoric acid

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The compound$(s)$ which generate$(s)$ $N_2$ gas upon thermal decomposition below $300^{\circ} C$ is (are)
$A. NH_4NO_3$
$B. (NH_4)_2Cr_2O_7$
$C. Ba(N_3)_2$
$D. Mg_3N_2$

Of the following hydrides,which has the lowest boiling point?

Which pair of metals does not dissolve in nitric acid?

Which of the following statements is not valid for oxoacids of phosphorus?

$\underbrace{2NO + O_2}_{(X)} \rightleftharpoons \underbrace{2NO_2}_{(Y)} \underset{heat}{\overset{cold}{\longleftrightarrow}} \underbrace{N_2O_4}_{(Z)}$
$X, Y$ and $Z$ can be described as:

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