The correct statement about electron-deficient hydride is that it:

1.	Does not have sufficient electrons to form a regular bond.
2.	Cannot be represented by conventional Lewis structures.
3.	Accept electrons.
4.	All of the above.

 

The hydrides of carbon (C_nH_{2n + 2}) can act as -

1. Lewis acid.

2. Lewis base.

3. Both 1 and 2

4. None of the above

“Non-stoichiometric hydrides” are :

Metallic hydrides are useful for hydrogen storage because : 

1. Metallic hydrides are oxygen-rich.

2. Metallic hydrides are oxygen-deficient.

3. Metallic hydrides are hydrogen-rich.

4. Metallic hydrides are hydrogen-deficient.

Atomic hydrogen or oxy-hydrogen torch is used for cutting and welding purposes because:

CO2  is used as a fire extinguisher because -

1. ${\mathrm{CO}}_2$ has high lattice energy.

2. ${\mathrm{CO}}_2$ will be effective in isolating the burning surface from dihydrogen and dioxygen.

3. ${\mathrm{CO}}_2$ is lighter than dioxygen.

4. ${\mathrm{CO}}_2$ is lighter than dihydrogen.

The temporary and permanent hardness of water is caused by -
1. Permanent hardness is caused by hydrogen carbonates and temporary hardness is caused by chlorides.
2. Temporary hardness is caused by dihydrogen and permanent hardness is caused by oxides.
3. Temporary hardness is caused by insoluble hydrogen carbonates and permanent hardness is caused by chlorides.
4. Temporary hardness is caused by hydrogen carbonates and permanent hardness is caused by chlorides.

The softening of hard water by synthetic ion-exchange resins is based on -

1. Increasing the lattice energy.

2. Physical separation.

3. Lowering the activation energy.

4. Exchange of cations and anions.

The catalyst used to increase the production of H₂ , by ‘coal gasification' process is -

1. Copper 

2. FeCr₂O₄ (iron chromate) 

3. Pd/C 

4. None of the above.

$$\begin{gathered} \mathrm{Fe}+{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\stackrel{1023-1073\mathrm{K}}{\to }<mspace\; width="1em"></mspace>\mathrm{Product} \\ <mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\left(\mathrm{Steam}\right) \\ \mathrm{Product}<mspace\; width="1em"></mspace>\mathrm{formed}<mspace\; width="1em"></mspace>\mathrm{is}<mspace\; width="1em"></mspace>- \\ 1.<mspace\; width="1em"></mspace>\mathrm{FeO}+{\mathrm{H}}_2 \end{gathered}$$

2. ${\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{H}}_2$

4. ${\mathrm{Fe}}_3{\mathrm{O}}_4+{\mathrm{H}}_2$