Acid rain is rain that is usually acidic due to the presence of sulphuric acid and nitric acid along with rain water. It is caused when harmful gases like sulphur dioxide and nitrogen oxides are released into the atmosphere which mix with water vapours and oxygen and fall down in the form of acid rain. It is defined as rain water having pH less than 5.6 and is harmful for living organisms.

For the given property, place a tick ✓ in the correct column. Property Acid Base Identified using indicators

Property Acid Base Identified using indicators ✓ ✓ The substances which assist in determining whether the given substance is acidic or basic, with the help of a colour change, are called indicators. Turmeric, China rose and litmus a re some naturally used acid-base indicators.

E M B I B E

CONCERT Science 7>Chapter 5 - Acids, Bases and Salts>STEP UP>Q 2

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7th CBSE

IMPORTANT

Earn 100

Litmus indicator is available in the form of ______

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Important Questions on Acids, Bases and Salts

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7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 5 - Acids, Bases and Salts>STEP UP>Q 2

A solution of crushed china rose petals turns _____ when added to a base.

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7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 5 - Acids, Bases and Salts>STEP UP>Q 2

A natural indicator that shows no change when added to an acid is _____.

MEDIUM

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 5 - Acids, Bases and Salts>STEP UP>Q 3

Read the statements given below.
All alkalis are bases.
Not all bases are alkalis.
Not all bases dissolve in water.
All alkalis dissolve in water.
Label the circles given below 'Alkalis' or 'Bases' taking into account the four given statements. Shade only the part that shows soluble substances.