Hydrogen Quiz-1

$HClO_4\;H_2O$ is

When NaH reacts with water, the gas liberated is

10 mL of $H_2O_2$ solution is treated with Kl and titration of liberated $l_2$, required 10 mL of 1 N hypo. Thus $H_2O_2$ is

30 volumes $H_2O_2$ means

In alkaline medium,$H_2O_2$ reacts with $Fe^{3+}$ and $Mn^{2+}$ respectively to give

In transforming 0.01 mole of PbS to $PbSO_4$, the volume of '10 volume' $H_2O_2$ required will be

Blackened oil painting can be restored into original form by the action of

In the Calgon process of softening of water, which of the following is used?

The reagent commonly used to determine hardness of water quantitatively is

The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre of water is expressed as :