Question

I dare u all if u can answer this question

1.FILL IN THE BLANKS
1.Zinc oxide is __________ when hot and __________when cold.
2.Stretched rubber band involves __________change.
3.Magnesium ribbon burn with a dazzling __________light.
4. when washing soda is added to ___________carbon dioxide gas is produced .
5.Rotation of fan is ________change.
6.A glowing of tube light is a __________
4.Chemical name of washing soda is _________
5.Rusting is faster in ___________water.
6.Two methods by which rusting can be prevented by _______and ________

Answer 1

1. Zinc oxide is yellow when hot and white when cold.

2. Stretched rubber band involves physical change.

3. Magnesium ribbon burn with a dazzling white light.

4. When washing soda is added to sulphuric acid to form sodium sulphate, water and carbon dioxide.

5. Rotation of fan is physical change

6. Rusting is faster in saline water.

7. Two methods by which rusting can be prevented is by galvanization and oiling.

Hope it helps :)