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The volume strength of 1.5 N H${}_2$O${}_2$ solution is:
(1) 4.8
(2) 8.4
(3) 3.0
(4) 8.0

Hydrogen peroxide in its reaction with ${\mathrm{KIO}}_4 \mathrm{and} {\mathrm{NH}}_2\mathrm{OH}$ respectively is acting as a 
1. reducing agent, oxidising agent
2. reducing agent, reducing agent
3. oxidising agent, oxidising agent
4. oxidising agent, reducing agent

The percentage of a para-hydrogen in ordinary hydrogen increases when:
1. temperature is lowered 
2. temperature is increased
3. pressure is increased and temperature decreased
4. none of these

The acidified solution of $FeC{l}_3$ is reduced by passing:
(1) ordinary $H_2$
(2) $O_2$
(3) nascent H
(4) $H_2$

Nascent hydrogen consists of :
(1) hydrogen atoms with excess energy
(2) hydrogen molecules with excess energy
(3) hydrogen ions in an excited state
(4) solvated protons

 Covalent hydride among the following is -
1. ${\mathrm{NH}}_3$ $\mathrm{and}$ ${\mathrm{B}}_2{\mathrm{H}}_6$
2. ${\mathrm{CaH}}_2$ $\mathrm{and}$ ${\mathrm{B}}_2{\mathrm{H}}_6$
3. $\mathrm{NaH}$ $\mathrm{and}$ ${\mathrm{CaH}}_2$
4. $\mathrm{NaH}$ $\mathrm{and}$ ${\mathrm{NH}}_3$

$H_2{O}_2$ is prepared in the laboratory by:
(1) $Mn{O}_2$ + dilute cold $H_{2}S{O}_4$
(2) $Ba{O}_2$ + dil sulphuric acid through cold water
(3) $Pb{O}_2$ + an acidified solution of $KMn{O}_4$
(4) $N{a}_2{O}_2$ + boiling water

The method used to remove the temporary hardness of water is-
1. Synthetic resins method
2. Calgon's method
3. Clark's method
4. Ion-exchange method

Exhausted permutit does not contain ............ ion –
(A) ${\mathrm{Na}}^{+}$                                      
(B) ${\mathrm{Mg}}^{2+}$
(C) ${\mathrm{Al}}^{3+}$                                    
(D) ${\mathrm{Si}}^{4+}$

Which of the following statement is correct –
1. Hydrogen has the same IP as alkali metals
2. H has the same electronegativity as halogens
3. H has oxidation no. –1 and +1
4. H₂ molecule will not be liberated at the anode in electrochemical cell

Metal which does not react with cold water but evolves H₂ with steam is –
(1) Na                           
(2) K
(3) Pt                             
(4) Fe

A neutral hydride among the following is -
1. H₂S
2. H₂O
3. H₂Se
4. H₂Te

Ionic hydrides react with water to give:
1. Acidic solutions.
2. Basic solutions.
3. Hydride ion.
4. Protons.