Find the correct statements related to group 15 hydrides.

A. Reducing nature increases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$

B. Tendency to donate lone pair of electrons decreases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$

C. The stability of hydrides decreases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$

D. HEH bond angle decreases from $\mathrm{NH}_3$ to $\mathrm{SbH}_3(\mathrm{E}=$ Elements of group 15)

Choose the correct answer from the options given below :

Treatment of a gas ' $X$ ' with a freshly prepared ferrous sulphate solution gives a compound ' $Y$ ' as a brown ring. The compounds X and Y are.

Given below are two statements :

Statement I : Aluminium is more electropositive than thallium as the standard electrode potential value of $\mathrm{E}^{\circ} \mathrm{Al}^{3+} / \mathrm{Al}$ is negative and $\mathrm{E}^{\circ} \mathrm{Tl}^{3+} / \mathrm{Tl}$ is positive.

Statement II : The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms $\mathrm{Al}^{3+}$ ion.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements :

Statement I: Aluminium upon reaction with NaOH forms $\left[\mathrm{Al}(\mathrm{OH})_6\right]^{3-}$ ion.

Statement II : The geometry of $\mathrm{ICl}_4^{-}, \mathrm{ClO}_3^{-}$and $\mathrm{IBr}_2^{-}$is square planar, pyramidal and linear respectively.

In the light of the above statements, choose the correct answer from the options given below :