Ionic radius (in $\mathring{A}$) of $As^{3+}$,$Sb^{3+}$ and $Bi^{3+}$ follow the order:

In $P_4O_6$,the number of oxygen atoms attached to each phosphorus atom is .......

$A$ $p$-block element $(E)$ and hydrogen form a binary cation $(EH_{x}^{+})$, while $EH_{3}$ on treatment with $K_{2}HgI_{4}$ in alkaline medium gives a precipitate of basic mercury$(II)$amido-iodine. Given below are first ionisation enthalpy values $(kJ \ mol^{-1})$ for the first element of each group $13, 14, 15$, and $16$. Identify the correct first ionisation enthalpy value for element $E$.

When chlorine reacts with a gas $X,$ an explosive inorganic compound $Y$ is formed. Then $X$ and $Y$ will be

Which of the following statements is correct?

Assertion $(A)$: $P_4O_{10}$ cannot be used to remove moisture from ammonia gas. Reason $(R)$: $P_4O_{10}$ reacts with $NH_3$ gas. The correct answer is: