Question Bank Directory

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:

Given the following five species: $NH_3, AlCl_3, BeCl_2, CCl_4, PCl_5$. The total number of these species that do not have eight electrons around the central atom in its/their outermost shell, is:

Match the following columns and select the correct option. Column-I (a) 6-15 pairs of gill slits (b) Heterocercal caudal fin (c) Air Bladder (d) Poison sting Column-II (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

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: $R=8.314 \text{ J K}^{–1}\text{ mol}^{–1}$; $\Delta G^\circ=+63.3 \text{ kJ}$]

For the reaction: $X_2O_4(l) \rightarrow 2XO_2(g)$ with the given values $\Delta U = 2.1 \text{ kcal}$ and $\Delta S = 20 \text{ cal K}^{-1}$ at $300 \text{ K}$, what is the value of $\Delta G$?

Joule-Thomson expansion is [JIPMER 2000]:

$2\text{Zn} + \text{O}_2 \rightarrow 2\text{ZnO}; \Delta G^\circ = -616\text{ J}$ $2\text{Zn} + \text{S}_2 \rightarrow 2\text{ZnS}; \Delta G^\circ = -293\text{ J}$ $\text{S}_2 + 2\text{O}_2 \rightarrow 2\text{SO}_2; \Delta G^\circ = -408\text{ J}$ $\Delta G^\circ$ for the following reaction is: $2\text{ZnS} + 3\text{O}_2 \rightarrow 2\text{ZnO} + 2\text{SO}_2$

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]:

Identify the correct statement for the change of Gibbs energy for a system ($\Delta G_{\text{system}}$) at constant temperature and pressure:

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are shown in the figure: $\text{AB} \rightarrow \text{Isothermal expansion}$, $\text{AC} \rightarrow \text{Adiabatic expansion}$. Which of the following options is not correct?

Match the following columns and select the correct option. Column-I: (a) Gregarious, polyphagous pest (b) Adult with radial symmetry and larva with bilateral symmetry (c) Book lungs (d) Bioluminescence. Column-II: (i) Asterias (ii) Scorpion (iii) Ctenoplana (iv) Locusta

Identify the incorrect statement.

$\Delta E^{\circ}$ of combustion of isobutylene is $-X \text{ kJ mol}^{-1}$. The value of $\Delta H^{\circ}$ is [DCE 2004]:

The following two reactions are known: $\text{Fe}_2\text{O}_3(s) + 3\text{CO}(g) \rightarrow 2\text{Fe}(s) + 3\text{CO}_2(g); \Delta H = -26.88\text{ kJ}$ $\text{FeO}(s) + \text{CO}(g) \rightarrow \text{Fe}(s) + \text{CO}_2(g); \Delta H = -16.5\text{ kJ}$ The value of $\Delta H$ for the following reaction: $\text{Fe}_2\text{O}_3(s) + \text{CO}(g) \rightarrow 2\text{FeO}(s) + \text{CO}_2(g)$ is:

Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water? The heats of solution ($\Delta H_{sol}$) of these compounds at $25^{\circ}C$ in kJ/mol of each solute are given in brackets [AMU (Engg.) 2000]:

Which of the following options correctly describes the free expansion of an ideal gas under adiabatic conditions?

Consider the following processes: $\frac{1}{2}\text{A} \rightarrow \text{B}; \Delta H = +150\text{ kJ/mol}$ $3\text{B} \rightarrow 2\text{C} + \text{D}; \Delta H = -125\text{ kJ/mol}$ $\text{E} + \text{A} \rightarrow 2\text{D}; \Delta H = +350\text{ kJ/mol}$ For $\text{B} + \text{D} \rightarrow \text{E} + 2\text{C}, \Delta H$ will be:

If the bond energies of $\text{H}-\text{H}$, $\text{Br}-\text{Br}$, and $\text{H}-\text{Br}$ are $433$, $192$, and $364\text{ kJ mol}^{-1}$ respectively, the $\Delta H^\circ$ for the reaction $\text{H}_2(g) + \text{Br}_2(g) \rightarrow 2\text{HBr}(g)$ will be:

If the standard enthalpy of neutralization reaction of HCl and NaOH is −57.3 kJ mol⁻¹, then find out the enthalpy of neutralization of 0.25 mol of HCl by 0.25 mol of NaOH: