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 :
1. | They react with water to form a metal hydroxide along with the liberation of oxygen gas. |
2. | They react with water to form a metal hydroxide along with the liberation of hydrogen gas. |
3. | They react with water to form a metal carbonate along with the liberation of oxygen gas. |
4. | They react with water to form a metal carbonate along with the liberation of hydrogen gas. |
H2O2 behave as a bleaching agent because :
1. | It acts as a strong oxidizing agent both in acidic and basic media. |
2. | It acts as a strong reducing agent both in acidic and basic media. |
3. | It acts as a strong oxidizing agent only in neutral media. |
4. | It acts as a strong reducing agent only in neutral media. |
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
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.
2.
3.
4.