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A student added quick lime to the beaker containing water. Which of the following is not correct observation of the student

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Dissolving quick lime in water produce white precipitate

He felt hot when he touched the bottom of the beaker

Dissolving quick lime in water is a combination reaction

When red litmus paper is dipped in the beaker it turns into blue colour

answer is D.

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Detailed Solution

Quicklime is chemically Calcium Oxide. When water is added to Quick lime, calcium hydroxide is formed and a lot amount of heat is released in this process. A hissing sound is also observed, the chemical reaction is

$\underset{quick lime}{CaO} + H_{2} O \to \underset{slaked lime}{Ca {(OH)}_{2}} + Heat$

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