Select the pair of compounds in which both have different hybridization but have the same molecular geometry.

Which of the following statements are true?

The number of sigma $(\sigma)$ and pi $(\pi)$ bonds in peroxodisulphuric acid are,respectively:

Which of the following behave as Lewis acids: $BF_3, SnCl_2, SnCl_4$?

Number of $\pi$ electrons in cyclobutadienyl anion $({C_4}{H_4})^{2-}$ is

Identify the thermal decomposition reactions that evolve a gas containing an equal number of $\sigma$ and $\pi$ bonds.
$(a)$ $BeCO_3 \xrightarrow{\Delta } BeO + CO_2$
$(b)$ $Fe_2(SO_4)_3 \xrightarrow{\Delta } Fe_2O_3 + 3SO_3$
$(c)$ $FeSO_4 \xrightarrow{\Delta } Fe_2O_3 + SO_2 + SO_3$
$(d)$ $(NH_4)_2Cr_2O_7 \xrightarrow{\Delta } Cr_2O_3 + N_2 + 4H_2O$
$(e)$ $ZnSO_4 \xrightarrow{\Delta } ZnO + SO_3$
$(f)$ $NH_4Cl \xrightarrow{\Delta } NH_3 + HCl$