The percentages of oxygen in two oxides of a metal are 22.2 and 30 respectively. The formula of the second oxide is `M_2O_3`. Deduce the formula of first.

Hydride of an element A contains 25% of hydrogen by mass. The percentages of oxygen in two oxides of that element are 57.1 and 72.7 respectively. If the atomic mass of the element be 12 determine the formula of the hydride and the two oxides.

Two oxides of a metal contains50% and 40% metal (M) respectively. Formula of the oxides are-

Two oxides of a metal (M) contain 22.53% and 30.38% of oxygen. If the second oxide be M_(2)O_(3) , find the formula of first oxide.

lf the equivalent mass of a metal (M) is x and the formula of its oxide is M_mO_n ,then show that the atomic mass of M is (2nx)/M

Formulas of oxide and chloride of an element A are A_(2)O_(5) and AC l_(3) respectively. Which group of the mendeleev's periodic table will the element belong to? State whetehr it is a metal or a non-metal.

State whether True or False: Formula of Ferric Oxide is Fe_2O .

The atomic mass of an element is a and the formula of its oxide is M_(2)O_(n) . Show that the equivalent mass of the element is (a)/(n) .