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Question

CaO(s)+H2O(l)Ca(OH)2(aq)+heat

What can be inferred from the above reaction?

(i) CaO is solid.

(ii) CaO reacts with water.

(iii) H2O is liquid.

(iv) H2O is in vapour state.

(v) Ca(OH)2 forms a solution with water.

(vi) The reaction is exothermic.


A

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

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B

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

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C

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

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D

(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 equations.

(s) represents solid,

(l) represents liquid,

(g) represents gas,

(aq) represents solution in water.

CaO(s)+H2O(l)Ca(OH)2(aq) + heat

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

(a) CaO is solid

(b) CaO and H2O react to produce products.

(c) H2O is in liquid state and not in the vapour state.

(d) Ca(OH)2 forms a solution with water.

(e) Heat is released in the reaction so it's an exothermic reaction.


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