State whether the following statements are true or false. Correct the false statements. [5 MARKS]
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.

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Solution

Each point: 1 Mark

(a) False. Substances can be neutral as well.
(b) False. Acids do not turn all indicators red.
(c)True. Lime water turns red litmus blue because it is basic.
(d) False. It does not change the colour of litmus at all.
(e)False. It is a man-made indicator.

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Question 13

State whether the following statements are true or false. Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red
(c) Lime water turns red litmus blue
(d) Common salt dissolved in water turns blue litmus red
(e) Phenolphthalein is a natural indicator
(f) Calamine can be used to treat ant’s sting
(g) Lemon water is basic in nature

Q58) Consider the following statements about acid-base indicators.

i) Phenolphthalein gives a pink colour if the solution is acidic.

ii) China rose indicator turns acidic solutions to dark pink.

iii) Blue litmus turns red for a basic solution.

Which of the above statements are true?

Q. Acids, acidic oxide and acidic salts :
(a) will turn red litmus blue
(b) will turn blue litmus red
(c) will turn pH paper orangish red
(d) will turn pH paper green

Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Nitric acid turns red litmus blue. (T/F)

(ii) Sodium hydroxide turns blue litmus red. (T/F)

(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)

(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)

(v) Tooth decay is caused by the presence of a base. (T/F)

Mark ‘T’ if the statement is true and ‘F’ if it is false

(i) Nitric acid turn red litmus blue. (T/F)

(ii) Sodium hydroxide turns blue litmus red. (T/F)

(iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)

(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)

(v) Tooth decay is caused by the presence of a base. (T/F)

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Each point: 1 Mark (a) False. Substances can be neutral as well. (b) False. Acids do not turn all indicators red. (c)True. Lime water turns red litmus blue because it is basic. (d) False. It does not change the colour of litmus at all. (e)False. It is a man-made indicator.

Each point: 1 Mark

(a) False. Substances can be neutral as well.
(b) False. Acids do not turn all indicators red.
(c)True. Lime water turns red litmus blue because it is basic.
(d) False. It does not change the colour of litmus at all.
(e)False. It is a man-made indicator.