Match the column:-

Column I	Column II
A. Heavy water	P. Bicarbonates of Ca & Mg
B. Temporary hardness	Q. No foreign ions
C. Soft water	R.  D2O
D. Permanent Hardness	S. Sulphates of Ca & Mg

 

	A	B	C	D
1.	S	P	Q	R
2.	R	P	Q	S
3.	P	Q	R	S
4.	S	R	P	Q

The formula of exhausted permutit is -

1. ${\mathrm{K}}_2{\mathrm{Al}}_2{\mathrm{Si}}_2{\mathrm{O}}_8.{\mathrm{xH}}_2\mathrm{O}$

2. ${\mathrm{CaAl}}_2{\mathrm{Si}}_2{\mathrm{O}}_8.{\mathrm{xH}}_2\mathrm{O}$

3. ${\mathrm{Na}}_2{\mathrm{Al}}_2{\mathrm{Si}}_2{\mathrm{O}}_8.{\mathrm{xH}}_2\mathrm{O}$

4. ${\mathrm{CaB}}_2{\mathrm{Si}}_2{\mathrm{O}}_8.{\mathrm{xH}}_2\mathrm{O}$

The freezing point of heavy water in comparison to normal water is -

1. Higher 

2. Lower 

3. Same

4. None of the above

The hydride formed by an element having valence shell electronic configuration $3d^{6}4s^2$ is -

1. Saline hydride.

2. Electron rich hydride.

3. Interstitial hydride.

4. No hydride.

An isotope that is used as a tracer in a chemical reaction is-

1. ${\mathrm{H}}_1^1$

2. ${\mathrm{H}}_1^2$

3. ${\mathrm{H}}_1^3$

4. Ortho hydrogen

A compound that can remove both temporary and permanent hardness of water is -

1. ${\mathrm{NaHCO}}_3$

2. Boiling

3. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

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

The correct match among the following is -

A compound among the following that has hydrogen in the atomic state is –

1. Metallic hydrides                           

2. Ionic hydrides

3. Molecular hydrides                       

4. Water

Exhausted permutit does not contain  –

1. ${\mathrm{Na}}^{+}$ ion                                     

2. ${\mathrm{Mg}}^{2+}$ ion

3. ${\mathrm{Al}}^{3+}$ ion                                  

4. ${\mathrm{Si}}^{4+}$ ion

Para hydrogen is-

1. Less stable than ortho hydrogen.

2. More stable than ortho hydrogen.

3. As stable as ortho hydrogen.

4. None of the above.