Question

4. How will carbon and sulphur react with oxygen? What happens when their products are dissolved in
water?
5. Why is sodium metal stored under kerosene?
6. What is displacement reaction? Give one example.
7. Why are lemon pickles cannot be stored in aluminium foil?
8. Write two important properties of metals?
9. What happens when suphur dioxide react with water? Give the chemical reaction.
10. What happen when magnecium ribbon is burnt in air?​

Answer 1

Answer:

It is very big

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Answer 2

4)Carbon and Sulphur reacts with oxygen to form oxides. When products are dissolved in water they form Carbonic Acid and Sulphuric Acid respectively.

5)Sodium metals are kept under kerosene as they are highly reactive and react vigorously with Oxygen.

6)It is a chemical reaction in which one elementary replaces another element which is placed lower in the activity series.

Example :- Zn + CuSO4 gives ZnSO4 + Cu

7) Because lemon pickle contains acid and when it reacts with aluminum it can spoil the pickle.

8) Malleability and Ductility

9) It forms Sulfurous Acid.

10) When magnesium ribbion is burnt in air it burns with a dazzling white light and a new compound magnesium oxide is formed. It is a chemical change.