Q1:-People throw empty bottles and wrappers on roads which not only hurt the passerby but also soil the roads.People are conscious of their rights but forget their civic duties.Write an article on the topic 'importance of Civic Sense.'
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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.