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Question

Take quick lime (Calcium oxide) in a beaker containing water. Take a little of this in a test tube and show a red litmus paper.

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Solution

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Red litmus paper turns to blue because calcium oxide dissolves in water to form calcium hydroxide. It is basic in nature.

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Similar Questions

Q1

Take some water in a beaker, add some quick lime (calcium oxide) and stir it. Take some clear solution in a test tube from the beaker and add a drop of red litmus solution.
a) What do you observe?
b) What is the substance formed when calcium oxide reacts with water? Complete the chemical equation of the reaction.
$$CaO + H_{2}O\rightarrow ......$$
c) What do you infer about the nature of this substance from this litmus test?

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Q2

When we take a small amount of calcium oxide or quick lime in a beaker and add water to it. Does there occur any change in temperature? Give a brief description of the process and this activity.

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Q3

A non-metal oxide was dissolved in water and then tested with both blue and red litmus papers. What will happen to the two litmus papers?

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Q4

What happens when pellets of calcium are added to water kept in a beaker?
(i) The solution produced turns red litmus paper to blue.
(ii) The gas released produces a pop sound when tested with a lighted splinter.
(iii) The calcium pellets burn with a brick-red flame.

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Q5

You are provided with three test tubes A, B and C as shown in Figure with different liquids. What will you observe when you put (a) a piece of blue litmus paper in each test tube. (b) a piece of red litmus paper in each test tube. (c) a few drops of phenolphthalein solution to each test tube.

Solution of Soap solution Pure water

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