Question

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Answer 1

Answer:

1.Mecury -metal

bromine-nonmetal

2. Sodium and potassium

3.silicon

4. reactivity series means that the arrangement of metals in the ascending order of their reactivity.

5. sodium is kept inside the kerosene oil because it is very reactive with the moisture and oxygen.

6.Feo+h2

mgcl2+h2

7. calcination means the heating of metal in absence of air is roasting means the heating of metal in the presence of air with excess of pressure in both.