The correct classification of H₂O, B₂H₆, and NaH respectively is-

1. Covalent, Covalent, & Covalent.

2. Covalent, Covalent, & Ionic.

3. Covalent, Ionic, & Covalent.

4. Interstitial, Covalent, & Covalent.

The correct order of increasing electrical conductance is -
1. BeH₂ > CaH₂ > TiH₂
2. BeH₂ < CaH₂ > TiH₂
3. TiH₂ < BeH₂ < CaH₂
4. BeH₂ < CaH₂ < TiH₂

The correct order of increasing reducing nature is -

1. NaH > H₂O < MgH₂

_{2. ${\mathrm{H}}_2\mathrm{O}$ > ${\mathrm{MgH}}_2$> NaH}

_{3. ${\mathrm{H}}_2\mathrm{O}$< ${\mathrm{MgH}}_2$ < NaH}

_{4. ${\mathrm{H}}_2\mathrm{O}$ $\simeq$ ${\mathrm{MgH}}_2$ < NaH}

The correct match among the following is -

Dihydrogen gas cannot be prepared with-

1. Cu + HCl (dil.)

2. Fe + H₂SO₄

3. Mg + steam

4. Na + alcohol

Hydrogen adsorbed on palladium is known as:

1. Atomic H

2. Nascent H

3. Occluded H

4. Heavy H

A water softening reagent among the following is -

1. ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2$

2. ${\mathrm{Na}}_3{\mathrm{PO}}_4$

3. ${\mathrm{Na}}_6{\mathrm{P}}_6{\mathrm{O}}_{18}$

4. ${\mathrm{Na}}_2{\mathrm{HPO}}_4$

The group that has hydride formed by only one member is -

1.  6

2.  7

3.  8

4.  9

Correlate the items listed in Column I with those listed in Column II. 

Codes

Match the items in Column I with the relevant items in Column II.

Codes