Hydrogen and Water - 2


Chemistry Class 10
1. Soft water consumes a large amount of soap in washing processes.

   
2. Insoluble calcium and magnesium sulphates reduce the efficiency of engine.

   
3. Atomic hydrogen is a powerful reducing agent.

   
4. The PH of water is 9.

   
5. Nitric acid is used for the preparation of hydrogen in the laboratory.

   
6. Nitric acid produces hydrogen only when it reacts with

   

   
Chemistry Class 10
7. In ice crystal each oxygen atom is surrounded by

   

   
Chemistry Class 10
8. Water has a maximum density at

   

   
Chemistry Class 10
9. Atomic mass of deutrium is

   

   
Chemistry Class 10
10. Permanent hardness of water is produced due to the presence of

   
   
Chemistry Class 10
11. The formula of washing soda is

   

   
Chemistry Class 10
12. Hydroscopic substances are used as

   

   
Chemistry Class 10
13. Polluted water produces a disease trachoma which effects on

   

   
Chemistry Class 10
14. Number of water molecules in hydrated copper sulphate crystal is

   

   
Chemistry Class 10
15. Heavy water is represented by the formula

   

   
This is more feedback!
This is the feedback!