The maximum possible number of hydrogen bonds a water molecule can form is –

(1) 2                                         

(2) 4

(3) 3                                         

(4) 1

${\mathrm{H}}_2{\mathrm{O}}_2$ acts as antiseptic due to its –

(1) Reducing property                           

(2) Oxidising property

(3) Bleaching property                           

(4) Acidic property

A compound that has both polar and non-polar bonds is  –

1. ${\mathrm{NH}}_4\mathrm{Cl}$                                    

2. $\mathrm{HCN}$

3. ${\mathrm{H}}_2{\mathrm{O}}_2$                                     

4. ${\mathrm{CH}}_4$

In which of the following reactions is ${\mathrm{H}}_2{\mathrm{O}}_2$ acting as an acid.

(A) $2{\mathrm{KMnO}}_4+3{\mathrm{H}}_2{\mathrm{SO}}_4+5{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{K}}_2{\mathrm{SO}}_4+{\mathrm{MnO}}_4+2{\mathrm{MnSO}}_4+8{\mathrm{H}}_2\mathrm{O}+5{\mathrm{O}}_2$

(B) $2{\mathrm{K}}_3\mathrm{Fe}{\left(\mathrm{CN}\right)}_6+2\mathrm{KOH}+{\mathrm{H}}_2{\mathrm{O}}_2\to 2{\mathrm{K}}_4\mathrm{Fe}{\left(\mathrm{CN}\right)}_6+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

(C) ${\mathrm{O}}_3+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{H}}_2\mathrm{O}+2{\mathrm{O}}_2$

(D) $\mathrm{Ba} {\left(\mathrm{OH}\right)}_2+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{BaO}}_2+{\mathrm{H}}_2\mathrm{O}$

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 metal cannot absorb hydrogen –

(1) Pd                                     

(2) Al

(3) Ni                                     

(4) Co

The best explanation for not placing hydrogen with the group of alkali metals or halogens is.

1. Hydrogen can form compounds with all other elements

2. Hydrogen is much lighter element than the alkali metals or the halogens

3. The IE of hydrogen is too high for group of alkali metals but too low for halogen group

4. None of these

The colour of hydrogen is –

1. Blue                           

2. Yellow

3. Orange                       

4. No colour

In which of the following compounds, hydrogen exists in the atomic state –

1. Metallic hydrides                           

2. Ionic hydrides

3. Molecular hydrides                       

4. Water

${}_1{}^2\mathrm{H}$ stands for –

(1) Protium                               

(2) Heavy water

(3) Deuterium                           

(4) Tritium