Question

ask fact teacz 1729 is lucky number 7×13 ×19 magical
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Answer 1

Explanation:

Indicators are those substances which tell us whether a substance is acidic or basic by change in colour. For e.g., litmus solution.

• Olfactory indicators: Those substances whose odour changes in acidic or basic media are called lfactory indicators. For e.g., clove, vanilla, onion.