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Writing Chemical Equations

CaO s + H 2 O...

Question

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

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

(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)

The following are the conventions used for representing physical states in 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) $C a O$ is solid

(b) $C a O$ and $H_{2} O$ react to produce the product, so $C a O$ reacts with water

(c) $H_{2} O$ is in the liquid state and not as a vapour

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

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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) $C a O$ reacts 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.

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.

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

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

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CaO(s)+H2O(l)→Ca(OH)2(aq)+heat What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO can react easily with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water

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

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