When a solution is added to a cloth strip treated with onion extract, then the smell of onion cannot be detected. State whether the given solution contains an acid or a base.

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Solution

Basic solutions subdue the pungent smell of onion, however acidic solutions have no such effect. Hence we can say that, the cloth strip must have been treated with a basic solution.

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When a solution is added to vanilla extract, then the characteristic smell of vanilla cannot be detected. State whether the given solution is an acid or a base.

Q. Smell of freshly cut onion is not detectable when HCl is added to it.

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 ___ .

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

(e) Onion and vanilla extract are ___ indicators.

few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

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.

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