Detection of gases — task. Science State Board, Class 6.

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Choose the best option:

1.

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The candle got extinguished due to the __________.

absence of carbon-di-oxide
absence of oxygen
presence of oxygen in air

2.

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What information can be inferred from the death of mouse?

Oxygen is essential for living
All living things need oxygen for breathing
Mouse should be kept in a closed jar

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