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प्रश्न
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain
विकल्प
water vapour
only oxygen gas
air
none of these
उत्तर
air
Explanation:
When Usha poured water on the lump of soil, the air trapped in it got displaced and air bubbles were formed.
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