Question

A pond weed is kept in a test tube filled with pond water.

Name the gas evolved.
by what is the source of the gas?
c) What would happen in terms of bubble count if:
i. Pond water is replaced by distilled water.
ii. A pinch of NaHCO3 is added to water in the test tube.
iii. Crushed dice is added to the water in the test tube.
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Answer 1

Answer:

I don't give the answer of

But I will know the Tick the correct answer is

No.2)A pinch of NaHCO3 is added to water in the test tube.

Please mark me brainliest answer