HARD
10th Tamil Nadu Board
IMPORTANT
Earn 100
‘A’ is a blue coloured crystalline salt. On heating it loses blue colour and to give ‘B’. When water is added, ‘B’ gives back to ‘A’. Identify A and B, write the equation.
Important Questions on Solutions
EASY
10th Tamil Nadu Board
IMPORTANT
The process in which a substance absorbs moisture from the atmospheric air to become moist and ultimately dissolves in the absorbed water.
MEDIUM
10th Tamil Nadu Board
IMPORTANT
HARD
10th Tamil Nadu Board
IMPORTANT
Complete the following table:
| Common name | Chemical name | Formula | Acid, base or salt | Efflorescent, hygroscopic or deliquescent substance. |
|
Blue vitriol Quick lime Oil of vitriol Washing soda Solid caustic soda |
MEDIUM
10th Tamil Nadu Board
IMPORTANT
In which of the following substances can there be an increase in weight when they are exposed to air.
1. Sodium chloride
2. Iron
3. Concentrated sulphuric acid
4. Table salt
5. Sodium carbonate crystals
