Neet PYQ 2007

Given that bond energy of $\text{H—H}$ and $\text{Cl-Cl}$ is $430{\text{ kJ mol}}^{-1}$ and $240{\text{ kJ mol}}^{-1}$ respectively and $\Delta H_f$ for $\text{HCl}$ is $-90{\text{ kJ mol}}^{-1}$. The bond enthalpy of $\text{HCl}$ is:

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. $\text{HCl}$ is called:

Which one of the following anions is present in the chain structure silicates?

The fraction of total volume occupied by the atoms present in a simple cube is:

For the following anions: (i) ${\text{I}}^{-}$, (ii) ${\text{Cl}}^{-}$, (iii) ${\text{Br}}^{-}$. (Question implies adding (iv) ${\text{F}}^{-}$ based on options). The increasing order of nucleophilicity in a polar protic solvent would be: