Which of the following acids forms three series of salts?

Which pair of oxyacids of phosphorus contains $P-H$ bonds?

Heating $(NH_4)_2Cr_2O_7$ produces a gas. This gas can also be obtained by:

The electronegativity of a group $13$ element '$E$' is the same as that of $Ge$ (on the Pauling scale and up to one decimal point). The $CORRECT$ statements about $E^{3+}$ are:
$A$. It can act as a reducing agent.
$B$. It can act as an oxidizing agent.
$C$. $E^{3+}$ is more stable than $E^+$.
$D$. The standard electrode potential value for $E^{3+}/E$ is positive.

Which of the following represents laughing gas?

Select the compound in which $HCl$ is not the product of hydrolysis.