Q4 of 65 Page 18

Which one of the following metals does not react with cold as well as hot water?

Na (sodium) and Ca(calcium) react with water vigorously. Mg (Magnesium) reacts with water less vigorously than that of calcium and sodium. Fe (Iron), on the other hand, does not react with cold as well as hot water instantly. But when the iron is kept in contact with water for a long time, rusting of iron happens.

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2

The ability of metals to be drawn into thin wire is known as

 3

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity


(ii) Good electrical conductivity


(iii) Ductility


(iv) High melting point

 5

Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?

 6

What happens when calcium is treated with water?

(i) It does not react with water


(ii) It reacts violently with water


(iii) It reacts less violently with water


(iv) Bubbles of hydrogen gas formed stick to the surface of calcium