Physical properties in which D2O differs from H2O is/are:
1. solubility of salts in heavy water is less than in ordinary water
2. all physical constants of D2O are higher than H2O.
3. heavy water is almost 11% denser than light (normal) water.
4. all of the above.
Industrial preparation of is-
1. By the action of dilute sulphuric acid:
2. By the action of carbon dioxide:
3. By the action of phosphoric acid:
The correct order of increasing electrical conductance is -
1. BeH2 > CaH2 > TiH2
2. BeH2 < CaH2 > TiH2
3. TiH2 < BeH2 < CaH2
4. BeH2 < CaH2 < TiH2
The correct order of increasing reducing nature is -
1. NaH > H2O < MgH2
2. > > NaH
3. < < NaH
4. < NaH
Atomic hydrogen combines with almost all elements but molecular hydrogen does not because
1. Atomic hydrogen is highly unstable molecular, hydrogen is almost inert at room temperature.
2. Atomic hydrogen is highly inert, molecular hydrogen is almost unstable at room temperature.
3. Atomic hydrogen and molecular hydrogen are unstable.
4. Atomic hydrogen and molecular hydrogen are inert.
Choose reactions to explain the amphoteric nature of water.
H+ ions always get associated with other atoms or molecules due to -
1. | Ionisation enthalpy of hydrogen resembles that of alkali metals |
2. | Its reactivity is similar to halogens |
3. | It resembles both alkali metals and halogens |
4. | Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free |
The amount of present in 1 L of 1.5 N solution is:
1. 2.5 g
2. 25 g
3. 3.0 g
4. 8.0 g
Hard water can be produced by -
(1) Saturation of water with CaSO4
(2) Addition of to water
(3) Saturation of water with CaCO3
(4) Saturation of water with MgCO3