The percentage by weight of Hydrogen of is:
(1) 5.88
(2) 6.25
(3) 25
(4) 50
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
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
Match the following and identify the correct option
(a) CO(g)+H2(g) | (i) Mg(HCO3)2+Ca(HCO3)2 |
(b) Temporary hardness of water | (ii) An electron deficient hydride |
(c) B2H6 | (iii) Synthesis gas |
(d) H2O2 | (iv) Non-planar structure |
(a) | (b) | (c) | (d) | |
1. | (iii) | (ii) | (i) | (iv) |
2. | (iii) | (iv) | (ii) | (i) |
3. | (i) | (iii) | (ii) | (iv) |
4. | (iii) | (i) | (ii) | (iv) |
Choose reactions to explain the amphoteric nature of water.
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.
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: