Water is important in the biosphere and biological systems because :

1.	It constitutes around 65% of the human body and 95% of plants
2.	It acts as a carrier of various nutrients required by plants and animals for various metabolic reactions.
3.	The high heat of vaporization and heat of capacity of water helps in moderating the climate and body temperature of all living beings
4.	All of the above.

The properties of water which make it useful as a solvent is/are -

1. A high value of dielectric constant  

2. A high value of dipole moment

3. A high value of lattice energy

4. Both '1' and '2'

D2O cannot be used for drinking purposes, because - 

1.  it increases the rate of catabolic reactions 

2. it slows the rate of anabolic and catabolic reactions

3. it slows the rate of anabolic reactions.

4. it increases the rate of a reaction.

Saline hydrides can remove traces of water from organic compounds because :

H2O2 behave as a bleaching agent because :

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.

Hydrogen is placed separately in the periodic table because : 

1. It resembles alkali metals.

2. It shows the same reactions as halogens.

3. Both (1) and (2)

4. None of the above.

NH₃ is an example of :

1. Electron rich hydride

2. Electron-precise hydride

3. Electron deficient hydride

4. None of the above

Incorrect statement regarding structure of H₂O and H₂O₂ is:

1. In gaseous phase, water molecule has a bent form.

2. Bond angle of water is $109.0°$

3. Hydrogen peroxide has a non-planar structure.

4. The dihedral angle of H₂O₂ in gas phase is 111.5° 

The reaction that is not an example of a hydrolysis reaction is-

1. $\mathrm{PbS}\left(\mathrm{s}\right) +{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{aq}\right) \to {\mathrm{PbSO}}_4\left(\mathrm{s}\right) + {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

2. $\mathrm{CaO}\left(\mathrm{s}\right) + {\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \to \mathrm{Ca}{\left(\mathrm{OH}\right)}_2 \left(\mathrm{aq}\right)$

3. ${\mathrm{AlCl}}_3\left(\mathrm{g}\right) + 3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \to {\mathrm{Al}}_2{\mathrm{O}}_3\left(\mathrm{s}\right) + 6\mathrm{HCl}\left(\mathrm{aq}\right)$

4. ${\mathrm{Ca}}_3{\mathrm{N}}_2\left(\mathrm{s}\right) + 6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \to 3\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right) + 2{\mathrm{NH}}_3\left(\mathrm{g}\right)$