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प्रश्न
Give a reason why nitrogen is filled in food packets and not oxygen.
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उत्तर
Nitrogen being inert or unreactive is filled into food packets to drive out the oxygen and reduce bacterial growth. The food package then stays well preserved.
संबंधित प्रश्न
What are the causes of air pollution?
Write ‘True’ or ‘False’ in front of following statement.
Water containing dissolved carbon dioxide can dissolve marble.
Tick (√) the most appropriate answer.
A gas which dilutes the activity of oxygen in air is:
Name and briefly explain four ways by which pollution of air is caused by humans.
Write fully balanced equation for the following :
CO2 + H2O →
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
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______ present in the air is needed for respiration.
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
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- Some water entered the bottle.
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- No bubbles formed, only water entered the bottle.
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Observe the picture given in Fig. carefully and answer the following questions.

Why is he putting a cover on his nose?
