Give reasons and the activity
Select the incorrect observations from the statements given:
I. The amount of Carbon dioxide in atmospheric air and exhaled air are equal.
II. Exhaled air contains more Carbon dioxide as compared to atmospheric air.
III. Atmospheric air contains more carbon dioxide as compared to exhaled air.
IV. Lime water immediately turns milky in both the test tubes.
(a)I and IV
(b)II and IV
(c)I, II and III
(d)I, III and IV
54. In 2nd activity Riya observed that:
(a)Lime water turns milky in test tube after some time.
(b)Lime water turns milky in test tube immediately.
(c)No change in color is observed.
(d)Lime water in test tube turns blue black.
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Answer:
Option d. I, III and IV is the correct answer and Q.54 the answer is a).
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a)I and IV is the correct answer.
que 54:-
Answer-
b)Lime water turns milky in test tube immediately.
When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate.
Ca(OH)2(aq) + CO2(aq)→ CaCO3(s)↓ + H2O(l)
Calcium carbonate precipitates as a milky white precipitate. This is a qualitative test for the presence of hydroxide salts.
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