4. d and f- block elements — Chemistry STD 12 Science — Question

$(A)$ $\mathrm{Bi}_2 \mathrm{O}_5$ is more basic than $\mathrm{N}_2 \mathrm{O}_5$

$(B)$ $\mathrm{NF}_3$ is more covalent than $\mathrm{BiF}_3$

$(C)$ $\mathrm{PH}_3$ boils at lower temperature than $\mathrm{NH}_3$

$(D)$ The $\mathrm{N}-\mathrm{N}$ single bond is stronger than the $P-P$ single bond