An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

The gas that can be collected by downward displacement of air is

Water for town supply is chlorinate to make it free from

In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by

X(g) + 3Y(g) ---- 2z(g) H = +ve. if the reaction above takes place at room temperature, the G will be

The furring of kettles is caused by the presence in water of

Due to the high reactivity of sodium, it is usually stored under

Ca(OH)2(s) + 2NH4Cl(g) → CaCl2(s) + 2H2O2(l) + X. In the reaction above X is

If 100cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16...