In chlorine,the isotopes $^{35}Cl$ and $^{37}Cl$ are present in the ratio $3:1$. Calculate the atomic mass of chlorine. (in $amu$)

Write the formulae for the following compounds:
$(a)$ Mercury $(II)$ chloride
$(b)$ Nickel $(II)$ sulphate
$(c)$ Tin $(IV)$ oxide
$(d)$ Thallium $(I)$ sulphate
$(e)$ Iron $(III)$ sulphate
$(f)$ Chromium $(III)$ oxide

$A$ bivalent metal has an equivalent mass of $32$. The molecular mass of the metal nitrate is

$116 \ mg$ of a compound on vaporisation in a Victor Meyer's apparatus displaces $44.8 \ mL$ of air measured at $S.T.P.$ The molecular weight of the compound is

Hydrazine reacts with $KIO_3$ in the presence of $HCl$ as:
$N_2H_4 + IO_3^- + 2H^+ + Cl^- \rightarrow ICl + N_2 + 3H_2O$
The equivalent masses of $N_2H_4$ and $KIO_3$ respectively are:

If the equivalent mass of $S$ in $SO_2$ is $8$,what is the equivalent mass of $S$ in $SO_3$?