For the galvanic cell, \(\mathrm{Zn}(\mathrm{s})+\mathrm{Cu}^{2+}(0.02 \mathrm{M}) \rightarrow \mathrm{Zn}^{2+}(0.04 \mathrm{M})+\mathrm{Cu}(\mathrm{s})\) \(\mathrm{E}_{\text {cell }}=...... \,\times 10^{-2} \,\mathrm{~V} { (Nearest integer) }\) \({\left[\text { Use }: \mathrm{E}_{\mathrm{Cu} / \mathrm{Cu}^{2+}}^{0}=-0.34\, \mathrm{~V}, \mathrm{E}_{2 \mathrm{n} / \mathrm{Zn}^{2+}}^{0}=+0.76 \,\mathrm{~V}\right.}\) \(\left.\frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059\, \mathrm{~V}\right]\)

\({image}\) In the above reaction, \(3.9\, g\) of benzene on nitration gives \(4.92\, g\) of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is............. \(\%\). (Round off to the Nearest Integer). (Given atomic mass: \(C : 12.0\, u , H : 1.0\, u\)\(O : 16.0\, u , N : 14.0\, u )\)

The reactions which cannot be applied to prepare an alkene by elimination, are

Choose the correct answer from the option given below :

Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with \(HBF_4\). Which of the following conditions is correct about this reaction?

Alkaline oxidative fusion of \(\mathrm{MnO}_2\) gives \("A"\) which on electrolytic oxidation in alkaline solution produces \(B. A\) and \(B\) respectively are _______.

Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with \(t_{1/2} = 3\) hour. The percentage of sucrose remaining after \(6\) hours is _______. (Nearest integer) (Given: \(\log 2 = 0.3010\) and \(\log 3 = 0.4771\))

For the reaction, \(2A + B\,\to \) products , when the concentrations of \(A\) and \(B\) both were doubled, the rate of the reaction increased from \(0.3\,mol\,L^{-1}\,s^{-1}\) to \(2.4 \,mol\,L^{-1}\,s^{-1}.\) When the concentration of \(A\) alone is doubled, the rate increased from \(0.3\,mol\,L^{-1}\,s^{-1}\) to \(0.6\,mol\,L^{-1}\,s^{-1}.\) Which one of the following statements is correct?

The final product \(\mathrm{A}\), formed in the following reaction sequence is: \(\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}_2 \xrightarrow[\text { (iii) } \mathrm{HBr}{(iv) \mathrm{Mg}, ether, then \mathrm{HCHO} / \mathrm{H}_3 \mathrm{O}^{+}}]{{(i)BH_3}{\text { (ii) } \mathrm{H}_2 \mathrm{O}_2,{ }^{\text {(-) }} \mathrm{OH}}} \mathrm{A}\)

A photon is emitted in transition from \(n =4\) to \(n =1\) level in hydrogen atom. The corresponding wavelength for this transition is \(.........\,nm\) \(\text { (given, } h =4 \times 10^{-15} eVs \text { ) : }\)

Which of the following complex ions has electrons that are symmetrically filled in both \(t_{2g}\), and \(e_g\) orbitals ?

Three small identical bubbles of water having same charge on each coalesce to form a bigger bubble. Then the ratio of the potentials on one initial bubble and that on the resultant bigger bubble is:

The least count of the main scale of a vernier callipers is \(1\, mm\). Its vernier scale is divided into \(10\) divisions and coincide with \(9\) divisions of the main scale. When jaws are touching each other, the \(7\) th division of vernier scale coincides with a division of main scale and the zero of vernier scale is lying right side of the zero of main scale. When this vernier is used to measure length of a cylinder the zero of the vernier scale between \(3.1\, cm\) and \(3.2\, cm\) and \(4^{th}\) \(VSD\) coincides with a main scale division.The length of the cylinder is \(.....cm\) (\(VSD\) is vernier scale division)

The number of integers, between \(100\) and \(1000\) having the sum of their digits equals to \(14\) , is ............