13. If a moist blue litmus paper is brought near Co, gas
a) It will remain blue
b) It will change to red
c) It will become colourless
d) It will catch fire
14. The pH of pure water is
b) 5
a) 2
I ]
c) 7
d) 10
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Answer:
Keep in mind that carbon dioxide itself does not change the color of dry litmus paper. ... You can get the same result by exposing carbon dioxide to moist litmus paper--the gas will react with the moisture to produce an acidic solution, thus turning blue litmus paper red.
Explanation:
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