Explanation:

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Answer:

a) Acids turn blue litmus red. - True

Reason : Acids turn Blue Litmus paper red and Bases remain the same in blue litmus red.

b) Bases turn red litmus blue. - True

Reason : Bases turn red litmus blue and Acids remain the same in red litmus.

c) Water changes the colour of a litmus - False

Reason : Because Water is neutral and it does not show any change in colour.

d) Both (A) and (B) - True

Hence, (d) is the correct answer.

Know more :-

Acids : Some chemical substances which are sour to taste are called Acids.

Example : Lemon juice, Orange juice and vinegar.

Bases : Some chemical substances which bitter to taste and feel soapy on touching are called Bases.  

Example : Baking soda and Soap.

Neutral : Some substances which are neither acidic nor basic is known as neutral substances.

Example : Water

Indicators : Some substances cannot be tasted or touched, So a special type of substances are used to test whether a substance is acidic or basic. These substances are known as indicators.

Some natural indicators are Turmeric , Lichen , China rose. Some chemical indicators are phenolphthalein also known as "phph".

Neutralisation : The reaction between an acid and a base is known as neutralisation. During this process Salt and water are produced with the evolution of heat.

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