Atoms of element X form hcp lattice and those of element Y occupy ${2 \over 3}$ of its tetrahedral voids. The percentage of element X in the lattice is ____________. (Nearest integer)

The osmotic pressure exerted by a solution prepared by dissolving 2.0 g of protein of molar mass 60 kg mol^$-$1 in 200 mL of water at 27$^\circ$C is ______________ Pa. [integer value]

(use R = 0.083 L bar mol^$-$1 K)

Ionic radii of cation $\mathrm{A}^{+}$ and anion $\mathrm{B}^{-}$ are 102 and respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for . is present in all octahedral voids. The edge length of the unit cell of the crystal AB is __________ pm. (Nearest Integer)

On heating, $\mathrm{LiNO_3}$ gives how many compounds among the following __________

$\mathrm{Li_2O,N_2,O_2,LiNO_2,NO_2}$

Total number of species from the following which can undergo disproportionation reaction is ________.

$\mathrm{H}_2 \mathrm{O}_2, \mathrm{ClO}_3^{-}, \mathrm{P}_4, \mathrm{Cl}_2, \mathrm{Ag}, \mathrm{Cu}^{+1}, \mathrm{~F}_2, \mathrm{NO}_2, \mathrm{K}^{+}$

Only $2 \mathrm{~mL}$ of $\mathrm{KMnO}_4$ solution of unknown molarity is required to reach the end point of a titration of of oxalic acid in acidic medium. The molarity of solution should be ________ M.

In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $(+)$ _________.