Match the following: (a) pH (i) a product of reaction of an acid with a base (b) phenolphthalein (ii) the scale used to measure acidity/basicity (c) salt (iii) damaging material it touches (d) acid (iv) has a high concentration of H + ions (e) base (v) a type of indicator (f) corrosive (vi) a substance which changes colour in acid or base (g) indicator (vii) has a high concentration of OH - ions

(a) pH is a scale used to measure the acidity/basicity of a substance. (b) Phenolphthalein is a type of synthetic indicator. (c) Salt is a product of the reaction of an acid with a base. (d) Acids have a high concentration of H + ions. (e) Bases have a high concentration of OH - ions. (f) Corrosive substances damage the material which it touches. (g) An indicator is a substance that changes colour in acid or base. (a) pH (ii) the scale used to measure acidity/basicity (b) phenolphthalein (v) a type of indicator (c) salt (i) a product of the reaction of an acid with a base (d) acid (iv) has a high concentration of H + ions (e) base (vii) has a high concentration of OH - ions (f) corrosive (iii) damaging material it touches (g) indicator (vi) a substance which changes colour in acid or base

When precipitation of rain picks up pollutants like the oxides of carbon, sulphur and nitrogen released by the industries from the atmosphere, sulphuric acid, nitric acid and other acidic substances are produced. This results in acid rain. It gradually damages vegetation, soil and many organisms.

E M B I B E

New Science Spark Book 7>Chapter 6 - Acids and Bases>Put on your THINKING CAP!>Q 5

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7th CBSE

IMPORTANT

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Name the acid present which brings fizz in cold drink.

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Important Questions on Acids and Bases

MEDIUM

7th CBSE

IMPORTANT

New Science Spark Book 7>Chapter 6 - Acids and Bases>Put on your THINKING CAP!>Q 6

Match the following:

(a) pH	(i) a product of reaction of an acid with a base
(b) phenolphthalein	(ii) the scale used to measure acidity/basicity
(c) salt	(iii) damaging material it touches
(d) acid	(iv) has a high concentration of $H^{+}$ ions
(e) base	(v) a type of indicator
(f) corrosive	(vi) a substance which changes colour in acid or base
(g) indicator	(vii) has a high concentration of ${OH}^{-}$ ions