Q89 of 102 Page 79

The element whose oxide will turn red litmus solution to blue will be:

Metals react with oxygen to form metallic oxides. These metallic oxides are basic because they react with water to form bases. Sodium is a metal, its oxide will be basic in nature and it will turn red litmus solution to blue.

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87

When a vessel is exposed to moist air for a long time, then a green coating is formed on its surface. The vessel must be made of:

 88

Which among the following is the most reactive metal?

 90

Which of the following is not a characteristic property of iron?

 91

Which of the following reactions will not occur? Why not?

(a) Zinc sulphate + Copper Copper Sulphate + zinc


(b) Copper Sulphate + Iron iron Sulphate + copper