Question Bank Directory

Among the following, the correct order of acidity is:

The number of electrons delivered at the cathode during electrolysis by a current of $1 \text{ ampere}$ in $60 \text{ seconds}$ is (charge on electron = $1.60 \times 10^{-19} \text{ C}$):

Buffer solutions have constant acidity and alkalinity because:

In $S_N2$ substitution reaction of the type $\text{R-Br} + \text{Cl}^- \xrightarrow{\text{DMF}} \text{R-Cl} + \text{Br}^-$, which one of the following has the highest relative rate?

$\text{CCl}_2\text{F}_2$ is one of the most common haloalkanes used in industries. The reaction through which it is manufactured from tetrachloromethane is called:

Zinc can be coated on iron to produce galvanised iron but the reverse is not possible. It is because

The pressure of $\text{H}_2$ required to make the potential of $\text{H}_2$-electrode zero in pure water at $298 \text{ K}$ is

In the history of biology, the human genome project led to the development of:

The molar conductance of $\text{NaCl}$, $\text{HCl}$, and $\text{CH}_3\text{COONa}$ at infinite dilution are $126.45$, $426.16$, and $91.0\text{ S cm}^2\text{ mol}^{-1}$ respectively. The molar conductance of $\text{CH}_3\text{COOH}$ at infinite dilution will be:

Conjugate acid of $\text{NH}_2^-$ is:

A reaction among the following can generate isonitriles as a major product. (A) $\text{R-X} + \text{HCN} \rightarrow$ (B) $\text{R-X} + \text{AgCN} \rightarrow$ (C) $\text{R-X} + \text{KCN} \rightarrow$ (D) $\text{R-X} + \text{NaCN} \xrightarrow{\text{C}_2\text{H}_5\text{OH}/\text{H}_2\text{O}}$ Choose the most appropriate answer from the options given below:

For the reaction, $CH_4(g) + 2O_2(g) \rightleftharpoons CO_2(g) + 2H_2O(l)$, $\Delta_r H = -170 \text{ kJ mol}^{-1}$. Which of the following statements is not true?

Given the following cell reaction: $2\text{Fe}^{3+}\text{(aq)} + 2\text{I}^-\text{(aq)} \rightarrow 2\text{Fe}^{2+}\text{(aq)} + \text{I}_2\text{(aq)}$ $E^\circ_{\text{cell}} = 0.24 \text{ V}$ at $298 \text{ K}$. The standard Gibbs energy $\Delta_r G^\circ$ of the cell reaction is: [Given: $F = 96500 \text{ C mol}^{-1}$]

Limiting molar conductivities, for the given solutions, are: $\lambda^0_m(\text{H}_2\text{SO}_4) = x \text{ S cm}^2 \text{ mol}^{-1}$ $\lambda^0_m(\text{K}_2\text{SO}_4) = y \text{ S cm}^2 \text{ mol}^{-1}$ $\lambda^0_m(\text{CH}_3\text{COOK}) = z \text{ S cm}^2 \text{ mol}^{-1}$ From the data given above, it can be concluded that $\lambda^0_m$ in $(\text{S cm}^2 \text{ mol}^{-1})$ for $\text{CH}_3\text{COOH}$ will be:

For the disproportionation of copper: $2Cu^+ \rightarrow Cu^{2+} + Cu$, $E^{\circ}$ is: (Given $E^{\circ}$ for $Cu^{2+}/Cu$ is $0.34\text{ V}$ and $E^{\circ}$ for $Cu^{2+}/Cu^+$ is $0.15\text{ V}$)

The molar conductance of an electrolyte increases with dilution according to the equation: $\Lambda_m = \Lambda^{\circ}_m - A\sqrt{c}$ Consider the following four statements: A: This equation applies to both strong and weak electrolytes. B: The value of the constant $A$ depends upon the nature of the solvent. C: The value of constant $A$ is the same for both $\text{BaCl}_2$ and $\text{MgSO}_4$. D: The value of constant $A$ is the same for both $\text{BaCl}_2$ and $\text{Mg(OH)}_2$. Which of the above statements are correct?

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for

For a cell reaction involving a two-electron change, the standard Emf of the cell is found to be $0.295\text{ V}$ at $25^{\circ}\text{C}$. The equilibrium constant of the reaction at $25^{\circ}\text{C}$ will be:

Standard electrode potential of three metals X, Y and Z are $-1.2 \text{ V}$, $+0.5 \text{ V}$ and $-3.0 \text{ V}$ respectively. The reducing power of these metals will be:

Which of the following cannot act both as a Bronsted acid and as a Bronsted base?