Question 11

Which of the following is an acid-base indicator?
(a) Vinegar
(b) Lime water
(c) Turmeric
(d) Baking soda

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Solution

Turmeric paste is a natural acid-base indicator. It changes colour from yellow to red when a basic solution is added to it. Hence option (c) is the correct answer.

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Question 19

Fill the blanks in the following sentences
(a) Lemon juice and vinegar taste ___ because they contain ___
(b) Turmeric and litmus are ___acid-base indicators.
(c) Phenolphthalein gives___colour with lime water
(d) When an acidic solution is mixed with a basic solution, they___ each other forming a and water.

Q. Complete the following equations.

(a)	Iron + Oxygen + Water →	....................
(b)	Vinegar + Baking soda →	....................
(c)	Carbon dioxide + Lime water →	....................
(d)	Copper sulphate + Iron →	....................

Q. Which of the following are acidic and which are basic?
(a) Lime water (b) Vinegar (c) Toothpaste (d) Stomach juices (e) Lemon juice (f) Baking soda solution (g) Milk of magnesia (h) Ammonia solution (i) Shampoo (j) Aerated drinks

Question 18.
Which of the following substances will not give carbon dioxide on treatment with dilute acid?

(a) Marble
(b) Limestone
(c) Baking soda
(d) Lime

Question 17.
Which one of the following can be used as an acid-base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves

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Natural Indicators

Standard VII Chemistry

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Question 11 Which of the following is an acid-base indicator? (a) Vinegar (b) Lime water (c) Turmeric (d) Baking soda

Turmeric paste is a natural acid-base indicator. It changes colour from yellow to red when a basic solution is added to it. Hence option (c) is the correct answer.

Question 11

Which of the following is an acid-base indicator?
(a) Vinegar
(b) Lime water
(c) Turmeric
(d) Baking soda