State reasons for the following statements:

(a) Tap water conducts electricity, whereas distilled water does not.

(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.

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Solution

(a) Tap water contains ions that conduct electricity, distilled water does not contain ions. Ions are the current carriers in liquids, hence distilled water does not conduct electricity.

(b) Baking soda does not allow milk to change into curd by neutralizing lactic acid formed with time. This delays the curdling of milk.

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Similar questions

(i) State reasons for the following statements:

(a) Tap water conducts electricity, whereas distilled water does not.

(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.

(c) For dilution of acid, acid is added into water and not water into acid.

(d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.

(ii) How is Bleaching powder prepared? Give its important uses?

Question 12(b)
A milkman adds a very small amount of baking soda to fresh milk.
(b) Why does this milk take a long time to set as curd?

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