1. Identify the correct statement from the followinga) Acids turn blue litmus red. b) Bases turn red litmus blue. c) Water changes the colour of a litmus d) Both (A) and (B)
Answers
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.