Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
If $C + O_2 \rightarrow CO_2$, $C + \frac{1}{2}O_2 \rightarrow CO$, and $CO + \frac{1}{2}O_2 \rightarrow CO_2$, the heats of reaction are $Q$, $-12$, and $-10$ respectively. Then $Q$ =
The enthalpy of combustion of $\text{H}_2$, cyclohexene ($\text{C}_6\text{H}_{10}$) and cyclohexane ($\text{C}_6\text{H}_{12}$) are $-241$, $-3800$ and $-3920 \text{ kJ per mol}$ respectively. Heat of hydrogenation of cyclohexene is:
Hydrolysis of sucrose is given by the following reaction. Sucrose + $H_2O \rightleftharpoons$ Glucose + Fructose. If the equilibrium constant ($K_c$) is $2 \times 10^{13}$ at 300 K, the value of $\Delta_r G^{\ominus}$ at the same temperature will be :
Which among the following species has a triangular planar shape?
If for a given substance melting point is $T_B$ and freezing point is $T_A$, then correct variation shown by graph between entropy change and temperature is
Which one of the following molecules contain no $\pi$ -bond?
A mixture of $N_2$ and Ar gases in a cylinder contains 7 g of $N_2$ and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of $N_2$ is : [Use atomic masses (in g $mol^{-1}$) : N = 14, Ar = 40]
The correct order of increasing bond length of $\text{C-H}$, $\text{C-O}$, $\text{C-C}$ and $\text{C=C}$ 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?
Standard entropies of $X_2$, $Y_2$ and $XY_3$ are $60$, $40$ and $50 \text{ J K}^{-1} \text{mol}^{-1}$ respectively. For the reaction $\frac{1}{2}X_2 + \frac{3}{2}Y_2 \rightleftharpoons XY_3$; $\Delta H = -30 \text{ kJ}$ to be at equilibrium, the temperature should be:
If a system is expanded under adiabatic process, then:
Which pair of the following compounds has one lone pair of electrons on the central atom?
Joule-Thomson expansion is [JIPMER 2000]:
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 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]:
What is the value of $K_{sp}$ of $\text{Ag}_2\text{CO}_3\text{(s)}$ in water at $25^\circ\text{C}$ for the following reaction: $\text{Ag}_2\text{CO}_3\text{(s)} \rightarrow 2\text{Ag}^+\text{(aq)} + \text{CO}_3^{2-}\text{(aq)}$? [Given: $R=8.314 \text{ J K}^{–1}\text{ mol}^{–1}$; $\Delta G^\circ=+63.3 \text{ kJ}$]
The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than the equimolal solution of Y in water. The correct statement in this case is:
Equal volumes of monoatomic and diatomic gases at the same initial temperature and pressure are mixed. The ratio of specific heats of the mixture ($C_p/C_v$) will be [AFMC 2002]:
The standard enthalpy and standard entropy changes for the oxidation of ammonia at $298\text{ K}$ are $-382.64\text{ kJ mol}^{-1}$ and $-145.6\text{ J K}^{-1}\text{ mol}^{-1}$, respectively. Standard Gibbs energy change for the same reaction at $298\text{ K}$ is:
The molar conductivity of 0.007 M acetic acid is 20 S cm$^2$ mol$^{-1}$. What is the dissociation constant of acetic acid? Choose the correct option. $\left[ \Lambda_{H^+}^\circ = 350 \text{ S cm}^2 \text{ mol}^{-1}, \Lambda_{CH_3COO^-}^\circ = 50 \text{ S cm}^2 \text{ mol}^{-1} \right]$