Hydrogen practice · Mixed difficulty

Which method cannot be used to remove hardness of water?

Which one of the following is used for laboratory preparation of ${D_2}{O_2}$

What is the amount of energy released (in $\mathrm{KJ}$ ) on combustion of $1 \mathrm{~g}$ of $\mathrm{H}_2$ gas?

In industrial method, $1 \% \mathrm{~H}_2 \mathrm{O}_2$ is obtained by auto oxidation of 2-ethyl anthraquinol. $1 \% \mathrm{~H}_2 \mathrm{O}_2$ so formed is extracted with

Which one of the following reaction does not form gaseous product?

Hydrogen peroxide oxidises ${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{4 - }}$ to ${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$ in acidic medium but reduces ${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}$ to ${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{4 - }}$ in alkaline medium. The other products formed are, respectively.

Heavy water possesses:

1000 g aqueous solution of $\mathrm{CaC}{\mathrm{O}_3}$ contains $10\;\mathrm{g}$ of calcium carbonate. Hardness of the solution is:

A dilute solution of ${\mathrm{H}_\mathrm{2}}{\mathrm{O}_\mathrm{2}}$ is labelled as 20 volume, its percentage strength is

Ordinary hydrogen at room temperature is a mixture of

Ordinary hydrogen has preponderance of:

The best explanations for not placing hydrogen with the group of alkali metals or halogens is:

To an aqueous solution containing ions such as $A{l^{3 + ,}}Z{n^{2 + ,\,}}C{a^{2 + ,\,}}F{e^{3 + ,}}N{i^{2 + ,}}B{a^{2 + }}\,and\,\,C{u^{2 + }}$ conc. $HCl$ was added followed by ${H_2}S$ . The total number of cations precipitated during this reaction is/are

The volume of oxygen liberated from $15\;\mathrm{mL}$ of 20 volume ${\mathrm{H}_2}{\mathrm{O}_2}$ is

In which of the following reactions, ${H_2}{O_2}$ act as a reducing agent,

The in correct statement(s) about heavy water is (are)
A) used as a moderator in nuclear reactor.
B) obtained as a by-product in fertiliser industry.
C) used for the study of reaction mechanism.
D) has a higher dielectric constant than water.
Choose the correct answer from the options given below:

The molarity of pure water at $4^\circ C$ is:

Which of the following produces hydrolith with di-Hydrogen

${XH}_2$ (ion exchange resin) can replace ${Ca}^{+2}$ ions in hard water as ${XH}_2+{Ca}^{+2} \longrightarrow {XCa}+2 {H}^{+}$. If $1 \mathrm{~L}$ hard water after passing through ${XH}_2$ has a $\mathrm{pH}=4$ then hardness in parts per million of ${Ca}^{+2}$ is

When a substance '$A$' reacts with water, it produces a combustible gas ' ${B}$ ' and a solution of substance ' ${C}$ ' in water. while another substance ' $D$ ' reacts with solution of $'C'$ to produce the same gas $'B'$ on warming while ' ${D}$ ' can produce gas ' ${B}$ ' on reaction with dilute ${H}_2 {SO}_4$ at room temperature. '$A$' imparts a deep golden yellow colour to a smokeless flame on Bunsen burner. Identify $'A', 'B', 'C'$ and ' ${D}$ ' respectively are

The starting material for convenient preparation of deuterated hydrogen peroxide $\left(\mathrm{D}_{2} \mathrm{O}_{2}\right)$ in laboratory is

Given below are two statements.
One is labelled as assertion (A) and the other is labelled as Reason (R).
Assertion (A) Heavy water is used for the study of reaction mechanism.
Reason (R) The rate of reaction for the cleavage of $O - H$ bond is slower than the of $O - D$ bond.
Choose the most appropriate answer from the options given below.

Which of the following statements is correct? Dielectric constant of ${\mathrm{H}_2}{\mathrm{O}_2}$

The boiling point of heavy water is:

Perhydrol is

The ionization energy of hydrogen is:

A sample of hard water containing ${Ca}^{2+}(\mathrm{aq})$ ions, having concentration $400 \, \mathrm{ppm}$ is passed through cation exchange resin $({RH})$ which exchanges ${Ca}^{2+}(\mathrm{aq})$ ions for ${H}^{+}(\mathrm{aq})$. What is the volume of $1 \, \mathrm{M}$ ${NaOH}$ required to neutralise $1 \mathrm{~L}$ of water obtained from cation exchange resin after exchange of ${Ca}^{2+}$ of hard water?

Ortho and parahydrogen differ in

If percentage strength of ${H_2}{O_2}$ solution is 17% then the volume strength of ${H_2}{O_2}$ solution will be

The ratio of moles of water as water of crystallisation in ${CaCl}_2$ and ${SrCl}_2$ is