One of the acids listed below is formed from $P_2O_3$ and the rest are formed from $P_2O_5$. The acid formed from phosphorus $(III)$ oxide is

In some of the reactions,thallium resembles aluminium,whereas in others,it resembles group-$I$ metals. Support this statement by giving some evidence.

Regarding the hydrides of group $15$ elements $EH_{3}$ $(E = N, P, As, Sb, Bi)$,select the correct statement from the following:
$A$. The stability of hydrides decreases down the group.
$B$. The basicity of hydrides decreases down the group.
$C$. The reducing character increases down the group.
$D$. The boiling point increases down the group.
Choose the correct answer from the options given below:

The number of hydroxyl group in pyrophosphoric acid is

Which of the following compounds does not give an oxyacid of the central atom on hydrolysis?

$Pb + \text{dil. } HNO_3 \xrightarrow{\text{Warm}} P + Q \uparrow + H_2O$
The incorrect statement for $Q$ is: