Hydrogen practice · Mixed difficulty

When zeolite is treated with hard water the sodium ions are exchanged with

The amount of ${\mathrm{H}_2}{\mathrm{O}_2}$ present in  1 L  of $1.5\;N\;{\mathrm{H}_2}{\mathrm{O}_2}$ solution is:

Calgon used as water softner is

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

Which of the following cannot be oxidized by $\mathrm{H}_2 \mathrm{O}_2$ ?

The property of hydrogen which distinguishes it from alkali metals is

Assertion (A) : Ionisation constant of $\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{CH}_3 \mathrm{COOD}$ are very equal.

Reason (R): The kinetic isotopic effect is not observed in the ionisation of weak acid.

The reaction, ${\mathrm{H}_2}\mathrm{S} + {\mathrm{H}_2}{\mathrm{O}_2} \to \mathrm{S} + 2{\mathrm{H}_2}\mathrm{O}$ manifests:

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is:

The synonym for water gas when used in the production of methanol is

$\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent in

An inorganic compound liberates ${\mathrm{O}_2}$ when heated, turns an acid solution of KI brown and reduces acidified $\mathrm{KMn}{\mathrm{O}_4}$. The substance is:

Ordinary hydrogen is a mixture at:

Permanent hardness of water can be removed by

What is the degree of hardness of a sample of water containing $6 \mathrm{mg}$ of $\mathrm{MgSO}_4$ (molecular mass 120 ) per $\mathrm{kg}$ of water?

100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate.
The hardness of this water sample expressed in terms of equivalents of $CaC{O_3}$ is
(molar mass of calcium bicarbonate is $162\,g\,mo{l^{ - 1}}$ and magnesium bicarbonate is $146\,g\,mo{l^{ - 1}}$)

The percentage of para hydrogen in ordinary hydrogen increases when:

Select the incorrect statement among the following

Which is true statement about ${D_2}O\,\,\mathrm{and}\,{H_2}O$

${K_\mathrm{a}}\;\mathrm{for}\;{\mathrm{H}_2}{\mathrm{O}_2}$ is of the order of:

The lightest gas is:

At ordinary temperature, the ortho and para hydrogen exist in the ratio of

Temporary hardness may be removed from water by adding

In which of the following reactions does hydrogen act as an oxidising agent:-

A sample of hard water has hardness expressed as $80 \mathrm{ppm}$ $\mathrm{Ca}^{2+}$. This sample is passed through a cation exchange resin column. Thus, $\mathrm{pH}$ of water coming out of exchange resin is

Heavy water is represented as

$\mathrm{Be}(\mathrm{OH})_{2}$ reacts with $\mathrm{Sr}(\mathrm{OH})_{2}$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following

The correct statements among (1) to (4) are:
1. Saline hydrides produce ${H_2}$ gas when reacted with ${H_2}O$
2) Reaction of $LiAl{H_4}$ with $B{F_3}$ leads to ${B_2}{H_6}$
3) $P{H_3}$ and $C{H_4}$ are electron rich and electron precise hydrides, respectively
4) $HF\mathrm{ }$ and $C{H_4}$are called as molecular hydrides

The bond energy of covalent O—H bond in water is:

Saline hydrides react explosively with water, such fires can be extinguished by