Among $\mathrm{VO}_2^{+}, \mathrm{MnO}_4^{-}$ and , the spin-only magnetic moment value of the species with least oxidising ability is __________ BM (Nearest integer).

Let $A$ be a square matrix of order 2 such that $|A|=2$ and the sum of its diagonal elements is $-$3 . If the points satisfying lie on a hyperbola, whose transverse axis is parallel to the -axis, eccentricity is and the length of the latus rectum is , then is equal to ________.

The mass of zinc produced by the electrolysis of zine sulphate solution with a steady current of $0.015 \mathrm{~A}$ for 15 minutes is _________ $\times 10^{-4} \mathrm{~g}$.

A transition metal '$\mathrm{M}$' among $\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and has the highest second ionisation enthalpy. The spin-only magnetic moment value of ion is _______ BM (Near integer)

Resistance of a conductivity cell (cell constant $129 \mathrm{~m}^{-1}$) filled with $74.5 \,\mathrm{ppm}$ solution of is (labelled as solution 1). When the same cell is filled with solution of , the resistance is (labelled as solution 2). The ratio of molar conductivity of solution 1 and solution 2 is i.e. . The value of is __________. (Nearest integer)

The 'spin only' magnetic moment value of $\mathrm{MO}_4{ }^{2-}$ is ________ BM. (Where M is a metal having least metallic radii. among and ).

$\mathrm{X} \mathrm{~g}$ of ethanamine was subjected to reaction with $\mathrm{NaNO}_2 / \mathrm{HCl}$ followed by hydrolysis to liberate and . The generated was completely neutralised by 0.2 moles of is _________ g.

Number of colourless lanthanoid ions among the following is __________.

$\mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Nd}^{3+}, \mathrm{La}^{3+}, \mathrm{Sm}^{3+}$