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Subjects
Science CBSE
Class 7 New
Exploring Substances: Acidic, Basic, and Neutral
Textbook Based Questions
7.
Nature of limewater
Exercise condition:
2
m.
Go through the following question and provide the answer:
A white powder X, when added to water, produces calcium hydroxide. What is the white powder X?
i. X is
calcium carbonate
calcium oxide
calcium hydrogen carbonate
calcium hydroxide
ii. Chemical equation is
\(Ca_2O + H_2O → Ca(OH)_2\)
\(Ca_2O + H_3O → Ca(OH)_2\)
\(Ca(OH)_2 + H_2O → CaO\)
\(CaO + H_2O → Ca(OH)_2\)
iii.
The effect of lime water on blue litmus paper is
turns blue litmus yellow
no change
turns red
turns blue litmus green
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