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Question

What is the pH of Milk of Lime?


A

More than 7

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B

Less than 7

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C

Any value between 0 to 14

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D

Equal to 7

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Solution

The correct option is A

More than 7


When excess calcium hydroxide is added to limewater, a suspension of calcium hydroxide particles is formed, which gives the solution a milky colour. The common name is, therefore, milk of lime.

If the pH value of a given solution is more than 7 then given solution is a base. If the pH value of the solution is less than 7 then the given solution is an acid. If the pH value of the solution is equal to 7 then the solution is neutral. Milk of lime is an alkali solution of Ca(OH)2, therefore, the pH value of milk of lime will be greater than 7.


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