Ca- cold water-What will be the products formed in the above reactions-

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Combination Reaction

Ca+ cold wate...

Question

$C a + cold water \to$
What will be the products formed in the above reactions?

C a (O H)_{2} + H_{2} O

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C a (O H)_{2} + H_{2}

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C a O + H_{2}

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No reaction

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Solution

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C a + 2 H_{2} O \to C a {(O H)}_{2} + H_{2} ↑

C a O + H_{2} O \to C a (O H)_{2}

\begin{matrix} C a O & + & H_{2} O & \to & C a (O H)_{2} & + H e a t e n e r g y C a l c i u m o x i d e & W a t e r & C a l c i u m h y d r o x i d e \end{matrix}

C a (O H)_{2}

C a + H_{2} O \to C a (O H)_{2} + H_{2} (↑)

Cao (s) + $H_{2} O$ (l) → $C a (O H)_{2}$ (aq) + heat.

What can be inferred from the above reaction?

(i) CaO is solid.

(ii) CaO is reactive with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water

(vi) The reaction is Exothermic.

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