In potash alum, the ratio of $K^+$ and $SO_4^{2-}$ ions is

Who is called the father of chemistry?

Nitrogen atom has an atomic number of $7$ and oxygen has an atomic number of $8$. The total number of electrons in a nitrate ion $(NO_3^-)$ will be:

State whether the following statements are true or false:
$(i)$ $^\circ F = \frac{9}{5} (^\circ C) + 32$
$(ii)$ In $1808$,Dalton published the law of chemical combination in the journal "New System of Chemical Philosophy".
$(iii)$ If the molar mass of a dibasic acid is $100$,its equivalent mass is $200$.

Identify the compound formed from elements $X, Y, Z$ having oxidation states $+2, +5, -2$ respectively.

Which sample contains the largest number of atoms?