$0.400 \mathrm{~g}$ of an organic compound $(\mathrm{X})$ gave $0.376 \mathrm{~g}$ of in Carius method for estimation of bromine. of bromine in the compound is ___________.

On a thin layer chromatographic plate, an organic compound moved by $3.5 \mathrm{~cm}$, while the solvent moved by $5 \mathrm{~cm}$. The retardation factor of the organic compound is ________ $\times 10^{-1}$.

In the following reactions, the total number of oxygen atoms in X and Y is ___________.

Na$_2$O + H$_2$O 2X

Number of oxygen atoms present in chemical formula of fuming sulphuric acid is ___________.

Metal deficiency defect is shown by Fe_0.93O. In the crystal, some Fe²⁺ cations are missing and loss of positive charge is compensated by the presence of Fe³⁺ ions. The percentage of Fe²⁺ ions in the Fe_0.93O crystals is __________. (Nearest integer)

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

The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)₂. The basicity of the acid 'A' is __________.

[M is a metal]

While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from $0.25 \mathrm{~g}$ of the compound neutralized $2.5 \mathrm{~mL}$ of $2 \,\mathrm{M} \,\mathrm{H}_{2} \mathrm{SO}_{4}$. The percentage of nitrogen present in organic compound is ______________.

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.

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

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

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

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