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Read the given statements carefully. Select which statement(s) is/are correct. Statement-I: There are some substances whose odour changes in acidic or basic media. These are called olfactory indicators. Statement-II: Vanilla extract and onion can be used as olfactory indicators.
Both statements I and II are true.
Statement-I is true but statement-II is false.
Both statements I and II are false.
Statement-I is false but statement-II is true.
Both statements I and II are true.
Remember the definition: Olfactory indicators change their smell (odour) rather than their colour when in contact with acids or bases.
Remember the definition: Olfactory indicators change their smell (odour) rather than their colour when in contact with acids or bases.
Analyze Statement I
An olfactory indicator is defined in chemistry as a substance whose odour changes in acidic or basic media. This is a standard scientific definition. Thus, Statement I is true.
Analyze Statement II
Vanilla extract, onion, and clove oil are the classic examples of olfactory indicators. Their characteristic smells are lost or altered when they are mixed with strong acids or bases. Thus, Statement II is true.
B: Statement II is true, so B is incorrect. C: Both statements are verified as true, so C is incorrect. D: Statement I is true, so D is incorrect.
A is correct because both the definition of olfactory indicators and the given examples (vanilla and onion) are scientifically accurate.
For Science-based Reasoning questions, prioritize definitions of specific chemical indicators (Litmus/Phenolphthalein/Methyl Orange vs Olfactory) to quickly narrow down true/false statements.
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