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Questions |
Answers |
| 1 |
An element X has four electrons in its outermost orbit. What will be the formula of its compounds with Hydrogen? |
XH4 |
| 2 |
According to weight, the percentage of Hydrogen in water (H2O), is – |
11.11 % |
| 3 |
One mole of hydrogen gas burns in excess of oxygen to give 290 KJ of heat. What is the amount of heat produced when 4g of Hydrogen gas is burnt under the same conditions? |
580 Kj |
| 4 |
Burning of hydrogen produces – |
Water |
| 5 |
Which fuels causes minimum air pollution? |
Hydrogen |
| 6 |
Heavy water is a type of – |
Coolant & Moderator |
| 7 |
The chemical formula of Heavy Water is – |
D2O |
| 8 |
The substance used as moderator and coolant both, in nuclear reactors is – |
Ordinary water & Heavy water |
| 9 |
What is heavy water? |
Oxygen + Heavy Hydrogen |
| 10 |
Who discovered heavy water? |
H.C. Urey |
| 11 |
Permanent hardness of water is due to – |
Chlorides and sulfates of Calcium and Magnesium |
| 12 |
The pH value for water is – |
Nearly 7 |
| 13 |
Which is the purest form of water? |
Rainwater |
| 14 |
Water is a good solvent of ionic salts because – |
It has a high dipole moment |
| 15 |
Water can dissolve more substances than any other liquid because – |
It is dipolar in nature |
| 16 |
Large quantities of drinking water is prepared from impure water by – |
Desalination |
| 17 |
Which gas is used in the purification of drinking water? |
Chlorine |
| 18 |
By which process the seawater can be converted into pure water? |
Reverse osmosis |
| 19 |
By which process, Alum cleans the muddy water? |
Coagulation |
| 20 |
The gas used in the manufacture of Vanaspati Ghee from Vanaspati Oil is – |
Hydrogen |
| 21 |
Which catalysts is used in the hydrogenation of vegetable oils? |
Nickel |
