Fill in the blanks in the following sentences :

(a) Acids have a _ taste and they turn _ litmus to _ .

(b) Substances do not show their acidic properties without _ .

(c) Acids produce _ ions on dissolving in water.

(d) Those substances whose smell (or odour) changes in acidic or basic solutions are called _ indicators.

(e) Onion and vanilla extract are ___ indicators.

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Solution

(a) sour, blue, red
(b) water
(c) hydogen
(d) olfactory
(e) olfactory

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Q. Fill in the blanks in the following sentences:
(a) Acids have a ..........................taste and they turn..........................litmus to..........................
(b) Substances do not show their acidic properties without.......................... .
(c) Acids produce.......................... ions on dissolving in water.
(d) Those substances whose smell (or odour) changes in acidic or basic solution are called .......................... indicators.
(e) Onion and vanilla extract are..........................indicators.

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.

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.

Acid-base Indicators are substances which show whether the substance is basic or acidic.

Q. Substances do not show their acidic properties without:

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(a) sour, blue, red (b) water (c) hydogen (d) olfactory (e) olfactory

(a) sour, blue, red
(b) water
(c) hydogen
(d) olfactory
(e) olfactory