The electrochemical cells \(Zn \left| Zn ^{2+} \| Cu ^{2+}\right| Cu\) and \(Fe ^{-} Fe ^{2+} \| Cu ^{2+} \mid Cu\) are connected in series. What will be the net emf of the cell at \(25^{\circ} C\) ? Given: \(E ^{\circ}\) of \(Zn ^{2+} \mid Zn =-0.76 V ; \quad E ^{\circ}\) of \(Cu ^{2+} \mid Cu =+0.34 V ; \quad E ^{\circ}\) of \(Fe ^{2+} \mid Fe =-0.41 V\)

Match List - I with List - II.

List - I	List - II
(A) \(Ni ^{2+}\)	(I) Pink
(B) \(Cu ^{2+}\)	(II) Purple
(C) \(Mn ^{2+}\)	(III) Green
(D) \(Ti ^{3+}\)	(IV) Blue

Choose the correct answer from the options given below :

For the following reaction, which is correct statement \(2 H ^{+}( aq )+2 e^{-} \rightarrow H _2(g)\)
under non-standard conditions.

Read the passage carefully and answer the questions
Replacement of a hydrogen atom in a hydrocarbon by an alkoxy or carboxyl group yields a class of compounds known as ethers. Ethers are classified as symmetrical or unsymmetrical on the basis of groups attached to the oxygen atoms. Diethyl ether, a symmetrical ether, has been widely used as an inhalation anesthetic. Ethers can be prepared by acid catalyzed intermolecular dehydration of alcohols and Williamson's synthesis. Acid catalyzed dehydration of alcohols is not generally preferred as it gives a mixture of elimination and substitution products. In Williamson's synthesis, an alkyl halide is allowed to react with sodium alkoxide. Ethers containing substituted Alkyl groups may also be prepared by this method. The C-O bond in ether is weakly polar and is cleaved under drastic conditions with excess of hydrogen halides. In electrophilic substitution, the alkoxy group deactivates the aromatic ring and directs the incoming group to ortho and para positions.
Which is most reactive hydrogen halide for cleavage of ethers?

Which transition metal ion is most stable against oxidation to its +3 state?

Arrange the following in increasing order of their basic strength in aqueous solution:
(A) \(CH_{3}NH_{2}\)
(B) \(C_{6}H_{5}CH_{2}NH_{2}\)
(C) \(C_{6}H_{5}NH_{2}\)
(D) \((CH_{3})_{3}N\)
Choose the \textbf{correct} answer from the options given below:

Which of the following will exhibit only +3 oxidation state?

The specific DNA sequence which is responsible for initiation of replication is known as:

Consider the LPP,
Maximize \(z=2 x+3 y\), subject to the conditions,
\(\begin{array}{l}x+y \leq 2 \\x \leq 2 \\x \geq 0, y \geq 0\end{array}\)
then maximum value of the objective function is:

If a line makes angles \(\alpha, \beta\) and \(\gamma\) with the positive directions of coordinate axes respectively, then \(\cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma\) is equal to

If the potential difference across a capacitor is changed from 12 V to 24 V, the work done is W. How much work will be done if the potential difference is changed from 24 V to 48 V?

Calculate the lowering of vapour pressure caused by the addition of \(5 0 ~ g\) of sucrose (mol mass = \(3 4 2 ~ g / m o l\) ) to \(7 5 0 ~ g\) of water, if the vapour pressure of pure water at Ambient temperature is 23.8 mm Hg

A light with an energy flux of 25 \( W/cm^2 \) falls on a non-reflecting surface at normal incidence. If the surface has an area of 50 \( cm^2 \) and the total energy falling on the surface is \( 10 \times 10^5 \) J. The total duration of time of the incidence of light is