Question Bank Directory

For the reaction $\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(l)$ which one is true?

The heat of combustion of carbon to $CO_2$ is -393.5 kJ/mol. The heat released upon the formation of 35.2 g of $CO_2$ from carbon and oxygen gas is:

For a given reaction, if $\Delta H = 35.5 \text{ kJ/mol}$ and $\Delta S = 83.6 \text{ J/K}\cdot\text{mol}$, at what temperature is the reaction spontaneous? (Assume $\Delta H$ and $\Delta S$ remain constant with temperature.)

For a sample of perfect gas when its pressure is changed isothermally from $p_i$ to $p_f$, the entropy change is given by:

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is:

Enthalpy change for the reaction, $4H(g) \rightarrow 2H_2(g)$ is $-869.6 \text{ kJ}$. The dissociation energy of the H-H bond is:

What is the entropy change (in J K⁻¹ mol⁻¹) when one mole of ice is converted into water at 0 ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol⁻¹ at 0 ºC)

Consider the following reactions: (i) $H^+(aq) + OH^-(aq) \rightarrow H_2O(l); \Delta H = -x_1 \text{ kJ mol}^{-1}$ (ii) $H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H = -x_2 \text{ kJ mol}^{-1}$ (iii) $CO_2(g) + H_2(g) \rightarrow CO(g) + H_2O(l); \Delta H = -x_3 \text{ kJ mol}^{-1}$ (iv) $C_2H_5(g) + \frac{5}{2}O_2(g) \rightarrow 2CO_2(g) + H_2O(l); \Delta H = -x_4 \text{ kJ mol}^{-1}$ Enthalpy of formation of $H_2O(l)$ is:

The formation of a solution from two components can be considered as: (i) Pure solvent → separated solvent molecules, ∆H₁ (ii) Pure solute → separated solute molecules, ∆H₂ (iii) Separated solvent and solute molecules → solution, ∆H₃ The solution so formed will be ideal if:

The heat of transition ($\Delta H_t$) of graphite into diamond would be, given the following thermochemical equations: 1. C(graphite) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = x$ kJ 2. C(diamond) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = y$ kJ

Work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from a pressure of 20 atmospheres to a pressure of 10 atmospheres is: (Given: R = 2.0 cal K–1 mol–1)

Match List I with List II. List-I (Process) A. Isothermal process B. Isochoric process C. Isobaric process D. Adiabatic process List-II (Conditions) I. No heat exchange II. Carried out at constant temperature III. Carried out at constant volume IV. Carried out at constant pressure Choose the correct answer from the options given below:

For irreversible expansion of an ideal gas under isothermal conditions, the correct option is:

Which p-V curve among the following depicts the highest amount of work done?

Match the processes or properties in List-I with their corresponding characteristics in List-II. List-I (Process/Property) A. Adiabatic process B. Reversible process C. Intensive property D. Extensive property List-II (Characteristic) I. Independent of the amount of substance II. The reaction can proceed in both directions, from reactants to products and vice versa III. No transfer of heat between the system and the surrounding IV. Dependent on the amount of substance Choose the correct answer from the options given below:

Determine $\Delta U$ for the process where, one mole of an ideal gas at $300 \text{ K}$ is expanded isothermally from $1 \text{ L}$ to $10 \text{ L}$ volume: (Use $R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$)

Match List-I (Equations/Conditions) with List-II (Type of processes) and select the correct option. **List-I (Equations)** (a) $K_p > Q$ (b) $T < \frac{\Delta H}{\Delta S}$ (for $\Delta H > 0$) (c) $K_p = Q$ (d) $T > \frac{\Delta H}{\Delta S}$ (for $\Delta H > 0$) **List-II (Type of processes)** (i) Non-spontaneous (ii) Equilibrium (iii) Spontaneous and endothermic (iv) Spontaneous

In a closed insulated container a liquid is stirred with a paddle to increase the temperature. The correct option regarding this among the following is:

Identify the correct statements from the following: (a) $CO_2(g)$ is used as refrigerant for ice-cream and frozen food. (b) The structure of $C_{60}$ contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.

Which of the following is not correct about carbon monoxide?