Question

1.Which test tube containing lime water takes more time to turn milky?
2.What does this tell us about the amount of carbon dioxide in the air that we breathe out?​

Answer 1

1)=Lime water is calcium hydroxide solution. On reacting with carbon dioxide it forms insoluble calcium carbonate which remains in water as a suspension rendering a milky white colour to it.

So, the correct answer is option B.

Answered = B...

2)=The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide. This is because our cells use oxygen from the inhaled air to release energy and give out carbon dioxide as a byproduct........

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Answer 2

1.Test tube a will take more time to turn milky.

• Lime water means calcium hydroxide which on reaction with carbon dioxide form calcium carbonte which is milky white. In test tube b carbon dioxide is supplied through blowing so, it turns milky easily.

2.This experiment clearly tell us about the huge amount of carbon dioxide we breathe out.