For a cell reaction, \(A(s)+B^{2+}(a q) \longrightarrow A^{2+}(a q)+B(s)\); the standard emf of the cell is \(0.295 \mathrm{~V}\) at \(25^{\circ} \mathrm{C}\). The equilibrium constant at \(25^{\circ} \mathrm{C}\) will be

Arrange the following compounds in the decreasing order of reactivity towards electrophilic substitution reaction.
(I) Chlorobenzene
(II) Nitrobenzene
(III) Benzene
(IV) Isopropylbenzene

Hydrogen bond is strongest in

For a reaction \(\mathrm{X}_2(\mathrm{l})+\mathrm{Y}_2(\mathrm{~g}) \leftrightharpoons 2 \mathrm{XY}(\mathrm{g})\), the \(\Delta \mathrm{H}^0\) and \(\Delta \mathrm{S}^0\) are \(+29.3 \mathrm{~kJ} / \mathrm{mol}\) and \(104.1 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\) respectively at 298 K . Find the free energy change in \(\mathrm{kJ} / \mathrm{mol}\).

Match the reactions in Column I with the correct products given in Column II:
\(\begin{array}{|l|l|l|l|} \hline \text{S.N.} & \text{Column I} & \text{S.No.} & \text{Column II} \\ \hline \text{A} & 1- \text{Chloropropane} + (\mathrm{Zn} / \mathrm{HCl}) \rightarrow & \text{P} & \text{Propanone + Methanal} \\ \hline \text{B} & n- \text{Hexane + (anh.} \left.\mathrm{AlCl}_3 / \mathrm{HCl}_{(\mathrm{g})}\right) \rightarrow & \text{Q} & \text{Propanone} \\ \hline \text{C} & 2- \text{Methylpropene} + ( \left.\mathrm{O}_3 ~\&~ \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}\right) \rightarrow & \text{R} & \text{Propane} \\ \hline \text{D} & \text{Propyne} +\left(\mathrm{HgSO}_4 / \mathrm{H}_2 \mathrm{SO}_4\right. at 333 K) \rightarrow & \text{S} & \text{2-Methylpentane + 3-Methylpentane} \\ \hline \end{array}\)

Which of the following reactions does not produce \(\mathrm{PH}_{3}\) ?

A drug that is antipyretic as well as analgesic is

The stopping potential when a metal surface is illuminated by light of wavelength \(\lambda\) is 15 V . The stopping potential when the same surface is illuminated by light of wavelength \(4 \lambda\) is 3 V . The ratio of threshold wavelength to the initial incident wavelength \(\lambda\) is:

Solubility product of the sparingly soluble salt \(\mathrm{AgBrO}_3\) in aqueous medium is \(9.3 \times 10^{-10}\) Calculate the mass in gram of \(\mathrm{AgBrO}_3\) present in 100 ml of its saturated solution.
(Molar mass of \(\mathrm{AgBrO}_3\) is \(236 \mathrm{~g} / \mathrm{mol}\) )

In the synthesis of NH\(_3\) from H\(_2\) and N\(_2\), if \(6 \times 10^{-2}\) mole of hydrogen disappears in 10 minutes, the number of moles of NH\(_3\) formed in 0.3 minutes is:

Distance of the point \((-2,3)\) from the line \(12 x-5 y-2=0\) is \(\dfrac{41}{k}\). Then the value of \(k\) is

Doping of silicon (Si) with indium (In) leads to the formation of

is