Bouveault-Blanc reduction reaction involves 

The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds 

The calculated magnetic moments (spin only value) for species \(\left[ FeCl _{4}\right]^{2-},\left[ Co \left( C _{2} O _{4}\right)_{3}\right]^{3-}\) and \(MnO _{4}^{2-}\) respectively are ..... .

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

Which one of the following chemical agent is not being used for dry-cleaning of clothes?

Consider the following plots of log of rate constant \(\mathrm{k}(\log \mathrm{k})\) vs \(\frac{1}{\mathrm{~T}}\) for three different reactions. The correct order of activation energies of these reactions is which?

Among the given oxides of nitrogen; \(N _{2} O , N _{2} O _{3}\), \(N _{2} O _{4}\) and \(N _{2} O _{5}\), the number of compound/(s) having \(N - N\) bond is ...

The total number of hydrogen atoms in product \(\mathrm{A}\) and product \(B\) is _______.

A volume of \(x mL\) of \(5 M NaHCO _3\) solution was mixed with 10 mL of \(2 M H _2 CO _3\) solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV , then the value of \(x =\)__________ mL (nearest integer).
\(Sn ( s )\left| Sn ( OH )_6^{2-}(0.5 M )\right| HSnO _2^{-}(0.05 M ) \mid OH ^{-} \left| Bi _2 O _3(s)\right| Bi ( s )\)
Consider upto one place of decimal for intermediate calculations
\(\left[\begin{array}{ll}\text { Given : } & E _{ HSnO _2^{-} \mid Sn ( OH )_6^{2-}}^{ o }=-0.9 V \\ & E _{ Bi _2 O _3 \mid Bi }^{ o }=-0.44 V \\ & pKa _{\left( H _2 CO _3\right)}=6.11 \\ & \frac{2.303 RT }{ F }=0.059 V \\ &\operatorname{Antilog}(1.29)=19.5\end{array}\right]\)

Two charges of \(5 Q\) and \(-2 Q\) are situated at the points \((3 a, 0)\) and \((-5 a, 0)\) respectively. The electric flux through a sphere of radius \(4a\) having center at origin is

The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is _______.

Given below are two statements:
Statement I: In the oxalic acid vs \(\mathrm{KMnO}_4\) (in the presence of dil \(\mathrm{H}_2 \mathrm{SO}_4\) ) titration the solution needs to be heated initially to \(60^{\circ} \mathrm{C}\), but no heating is required in Ferrous ammonium sulphate (FAS) vs \(\mathrm{KMnO}_4\) titration (in the presence of dil \(\mathrm{H}_2 \mathrm{SO}_4\) )
Statement II: In oxalic acid vs \(\mathrm{KMnO}_4\) titration, the initial formation of \(\mathrm{MnSO}_4\) takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs \(\mathrm{KMnO}_4\), heating oxidizes \(\mathrm{Fe}^{2+}\) into \(\mathrm{Fe}^{3+}\) by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below

In the above compounds correct order of reactivity in electrophilic substitution reactions will be