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Question -

Fill in the blanks in the following statements:

(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.

(b) The chemical name of baking soda is _________.

(c) Two methods by which rusting of iron can be prevented are _________ and

____ ____.

(d) Changes in which only _____ __ properties of a substance change are called physical changes.

(e) Changes in which new substances are formed are called _________changes.



Answer -

(a) When carbon dioxide is passed through limewater, it turns milky due to the formation of __calcium carbonate (CaCO3)_ .

(b) The chemical name of baking soda is __sodium hydrogen carbonate__.

(c) Two methods by which rusting of iron can be prevented are __galvanization__ and __ painting__.

(d) Changes in which only __physical__ properties of a substance change are called physical changes.

(e) Changes in which new substances are formed are called __chemical__ changes.

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