Question

State whether the following statements are true or false.

1. Nitric acid turns red litmus blue.

II. Indicator is a substance which shows different colours in acidic and basic solutions.

III. Iron pipes coated with zinc do not get rusted easily.

IV. Condensation of steam is not a chemical change.

V. Air contracts on heating and expands on cooling.

VI. Air around us exerts pressure.

VII. Capacity to hold water is more in sandy soil than clayey soil. VIII. The cooking of rice is a physical change.

IX. Frogs breathe through their skins as well as their lungs.

X. The polar regions are very cold throughout the year.​

Answer 1

Answer:

1 FALSE

2 TRUE

3 TRUE

4 TRUE

6 true

7 TRUE

8 FALSE

9 TRUE

10 TRUE

Answer 2

Answer:

(a) False, nitric acid turns blue litmus to ed because it is an acid.

(b) False, sodium hydroxide is a base, so it will turn red litmus to blue.

(c) True

(d) True

(e) False, tooth decay is caused by the presence of acid.

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