How would you show that a candle needs air to brun ?

ICSE-AIR-EXERCISE (OBJECTIVE QUESTIONS) (WRITE .T. FOR TRUE AND .F. FOR FALSE FOR THE FOLLOWING STATEMENTS)

1. How would you show that a candle needs air to brun ?

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2. The oxygen -to- nitrogen proportion in air is 1:5.

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3. There is a vacuum in an empty glass .

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4. Explain, why carbon dioxide turns lime water milky .

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5. Anhydrous copper sulphate (white ) turns blue with water .

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6. Nitrogen is combustile but not a supporter of combustion .

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7. The dust present in air helps the formation of clouds .

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