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

1. Higher 

2. Lower 

3. Same

4. None of the above

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}

Dihydrogen gas cannot be prepared with-

1. Cu + HCl (dil.)

2. Fe + H₂SO₄

3. Mg + steam

4. Na + alcohol

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

 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. $\mathrm{NaH}$ $\mathrm{and}$ ${\mathrm{NH}}_3$

The correct statement among the following regarding H₂O₂ is-

1. Two hydrogen atoms are connected to one oxygen atom.

2. All the four atoms are in the same plane.

3. The four atoms are arranged in a non-linear and non-planar manner.

4. O-H bonds are polar but the molecule is non-polar.