Question Bank Directory

Which one of the following molecules contain no $\pi$ -bond?

Bond dissociation enthalpy of $\text{H}_2$, $\text{Cl}_2$, and $\text{HCl}$ are $434$, $242$, and $431 \text{ kJ mol}^{-1}$ respectively. Enthalpy of formation of $\text{HCl}$ is:

If a system is expanded under adiabatic process, then:

For the reaction, $2\text{Cl(g)} \rightarrow \text{Cl}_2\text{(g)}$, the correct option is:

The correct order of increasing bond length of $\text{C-H}$, $\text{C-O}$, $\text{C-C}$ and $\text{C=C}$ is:

Which one of the following molecules is paramagnetic?

Given the following bond energies: $\text{H}-\text{H}$ bond energy: $431.37 \text{ kJ mol}^{-1}$ $\text{C}=\text{C}$ bond energy: $606.10 \text{ kJ mol}^{-1}$ $\text{C}-\text{C}$ bond energy: $336.49 \text{ kJ mol}^{-1}$ $\text{C}-\text{H}$ bond energy: $410.50 \text{ kJ mol}^{-1}$ Enthalpy for the reaction, $\text{CH}_2=\text{CH}_2 + \text{H}_2 \rightarrow \text{CH}_3-\text{CH}_3$ will be:

At $27^\circ\text{C}$ latent heat of fusion of a compound is $2930\text{ J/mol}$. Entropy change is:

The values of $\Delta H$ and $\Delta S$ for the given reaction are $170 \text{ kJ}$ and $170 \text{ J K}^{-1}$, respectively. $C(\text{graphite}) + CO_2(g) \rightarrow 2CO(g)$ This reaction will be spontaneous at:

The correct order of bond angles in the following compounds/species is:

The bond dissociation energies of $X_2$, $Y_2$ and $XY$ are in the ratio of $1 : 0.5 : 1$. $\Delta H$ for the formation of $XY$ is $-200 \text{ kJ mol}^{-1}$. The bond dissociation energy of $X_2$ will be:

The enthalpy of fusion of water is $1.435 \text{ kcal/mol}$. The molar entropy change for the melting of ice at $0^\circ\text{C}$ is:

Consider the following reaction: 2H2(g) + O2(g) → 2H2O(g); ΔrH° = -483.64 kJ. What is the enthalpy change (in kJ) for the decomposition of one mole of water?

The correct order of ionic character among CaH$$_2$$, BeH$$_2$$ and BaH$$_2$$ is:

Mark the correct order of repulsion among the following according to the VSEPR theory.

The correct order of dipole moments for molecules NH$$_3$$, H$$_2$$S, CH$$_4$$ and HF is:

The heat of neutralisation of a strong acid and a strong alkali is $57.0 \text{ kJ mol}^{-1}$. The heat released when $0.5 \text{ mole of } HNO_{3}$ solution is mixed with $0.2 \text{ mole of } KOH$ is [KCET 1991; AIIMS 2002]:

The correct order of energies of molecular orbitals of N$$_2$$ molecule is:

Which pair of the following compounds has one lone pair of electrons on the central atom?

The correct shape and hybridisation of BrF$_5$ is: