Decomposition of hydrogen peroxide can be prevented by adding

The atomic number of the element with highest ionisation energy among the following is

For a reaction of the type, \(2 \mathrm{X}+\mathrm{Y} \rightarrow \mathrm{A}+\mathrm{B}\), the following is the data collected:

Experiment	[X]	[Y]	Initial rate of formation of A
1	0.2	0.2	\(12.0 \times 10^{-3}\)
2	0.6	0.4	\(14.4 \times 10^{-2}\)
3	0.6	0.8	\(5.76 \times 10^{-1}\)
4	0.8	0.2	\(4.8 \times 10^{-2}\)

What is the overall order of the reaction?

The concentration of electrolyte required to coagulate a given amount of \(\mathrm{As}_{2} \mathrm{S}_{3}\) sol is minimum in the case of

Match the coordination compounds in Column I having the given type of hybridisation of \(\mathrm{M}^{\mathrm{n}+}\) ion and magnetic moment as given in Column II.
\(\begin{array}{|l|l|l|l|} \hline & \text { Coordination compounds. } & & \text { Hybridisation \& Magnetic nature. } \\ \hline \text { A } & \mathrm{Ni}(\mathrm{CO})_4 & \text { P } & \mathrm{sp}^3, \quad \mu=5.92 \mathrm{BM} \\ \hline \text { B } & {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}} & \text { Q } & \mathrm{sp}^3, \quad \mu=2.84 \mathrm{BM} \\ \hline \text { C } & {\left[\mathrm{Ni}(\mathrm{Cl})_4\right]^{2-}} & \text { R } & \mathrm{sp}^3, \quad \mu=0 \\ \hline \text { D } & {[\mathrm{MnBr}]^{2-}} & \text { S } & \mathrm{dsp}^2, \quad \mu=0 \\ \hline \end{array}\)

A buffer solution has equal volumes of \(0.1 \mathrm{~M} \mathrm{~NH}_4 \mathrm{OH}\) and \(0.01 \mathrm{~M} \mathrm{~NH}_4 \mathrm{Cl}\). The \(\mathrm{pK}_b\) of the base is 5. The \(\mathrm{pH}\) is

Choose the incorrect statement from the following.

IR region lies between

The group number of the element in the periodic table with the electronic configuration \((\mathrm{n}-1) \mathrm{d}^2 \mathrm{~ns}^2\).
For \(n=4\) is:

The adsorption of an inert gases on activated charcoal increase with

Which one of the following correctly represents the decreasing order of acidic nature of the given carboxylic acids:
[A] 2-Hydroxybenzoic acid
[B] Benzoic acid
[C] 3-Hydroxybenzoic acid
[D] 4- Hydroxybenzoic acid

\(\text { If } \vec{a} \text { and } \vec{b} \text { are unit vectors, then the angle between } \vec{a} \text { and } \vec{b} \text { for which } a-\sqrt{2} \vec{b} \text { is a unit vector is }\)

If \({}^{n}C_{13}\), \({}^{n}C_{14}\) and \({}^{n}C_{15}\) are in arithmetic progression, then the positive integer value of '\(n\)' can be