In the reaction,

Formation of \(X, Y\) and \(Z\) are known by

Which of the following statements are true about \(\left[\mathrm{NiCl}_4\right]^{2-}\) ?
(a) The complex has tetrahedral geometry
(b) Co-ordination number of Ni is 2 and oxidation state is +4
(c) The complex is \(\mathrm{sp}^3\) hybridised
(d) It is a high spin complex
(e) The complex is paramagnetic

Match List-I with List-II
\begin{array}{|l|l|l|l|}\hline & \text{List-I (Types of redox reactions)} & & \text{List-II (Examples)} \\\hline \text{a}. & \text{Combination reaction} & \text{(i)} & \mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{Br}_{(\mathrm{aq})}^{-} \rightarrow 2 \mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Br}_{2(\mathrm{l})} \\\hline \text{b.} & \text{Decomposition reaction} & \text{(ii)} & 2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{aq})} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(1)}+\mathrm{O}_{2(\mathrm{~g})} \\\hline \text{c.} & \text{Displacement reaction} & \text{(iii)} & \mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \xrightarrow{\Delta} \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(1)} \\\hline \text{d.} & \text{Disproportionation reaction} & \text{(iv)} & \mathrm{H}_2 \mathrm{O}_{(1)} \xrightarrow{\Delta} 2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\\hline\end{array}

Choose the correct answer from the options given below.

Consider the following gaseous equilibria with equilibrium constants \(\mathrm{K}_{1}\) and \(\mathrm{K}_{2}\) respectively.
\(\begin{aligned} \mathrm{SO}_{2}(\mathrm{~g})+& \frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_{3}(\mathrm{~g}) \\ 2 \mathrm{SO}_{3}(g) & \rightleftharpoons 2 \mathrm{SO}_{2}(g)+\mathrm{O}_{2}(g) \end{aligned}\)
The equilibrium constants are related as

The correct order of ionisation energy of \(\mathrm{C}, \mathrm{N}, \mathrm{O}\) and \(\mathrm{F}\) is

Which of the following electrolytic solutions has the least specific conductance?

\(\mathrm{NO}_2\) gas is

Which is the most suitable reagent for the following conversion ?

A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is

The standard emf of a galvanic cell involving 2 moles of electrons in its redox reaction is \(0.59 \mathrm{~V}\). The equilibrium constant for the redox reaction of the cell is

If \((\mathbf{a} \times \mathbf{b})^{2}+(\mathbf{a} \cdot \mathbf{b})^{2}=144\) and \(|\mathbf{a}|=4\), then \(|\mathbf{b}|\) is equal to

A tangent is drawn to the circle \(2 x^{2}+2 y^{2}-3 x+4 y=0\) at point \(A\) and it meets the line \(x+y=3\) at \(B(2,1)\), then \(A B\) is equal to

The reagent used to convert an alkyne to alkene is