$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q)$ + 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.

(i), (iii), (iv), (vi)

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(i), (ii), (iii), (v), (vi)

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(ii), (iii), (v), (iv)

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(v), (iv)

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Solution

The correct option is B
(i), (ii), (iii), (v), (vi)

Following are the conventions used for representing physical states in a chemical equation:

(s) represents solid,

(l) represents liquid,

(g) represents gas,

(aq) represents solution in water.

$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q)$ + heat

From the above equation, the following observations can be made.

(a) CaO is solid,

(b) CaO and $H_{2} O$ reacts to produce a product, so CaO is reactive with water.

(c) $H_{2} O$ is in liquid and not vapour.

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

(e) Heat is released in the reaction so exothermic.

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Similar questions

$C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q) + h e a t$

What can be inferred from the above reaction?

(i) $C a O$ is solid.

(ii) $C a O$ can react easily 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

$CaO(s) + H_{2} O (l) \to {Ca(OH)}_{2} (aq) + Heat$

What can be inferred from the above reaction?

Which of the following are examples of combination reaction?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

CaO (s) + H_{2} O (l) \to Ca {(OH)}_{2} (aq) + heat

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