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प्रश्न
Those substances whose smell (or odour) changes in acidic or basic solutions are called ______ indicators.
रिकाम्या जागा भरा
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उत्तर
Those substances whose smell (or odour) changes in acidic or basic solutions are called olfactory indicators.
Explanation:
Olfactory indicators rely on the sense of smell rather than sight to signal a change in pH. When these substances react with an acid or a base, a chemical reaction alters the shape of their odour-producing molecules. This structural change neutralises or modifies their natural scent, making them highly useful testing tools for visually impaired individuals.
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