Solid calcium oxide was taken in a container and water was added slowly to it.
(i) State two observations made in the experiment.
(ii) Write the balanced chemical equation of this reaction.
or
Write balanced chemical equations for the following reactions `:`
(a) dilute sulphuric acid reacs with aluminium powder.
(b) dilute hydrochloric acid reacts with sodium carbonate.
(c ) Carbon dioxideis passed through lime water.

Explanation

### Step-by-Step Solution:

#### Part (i): Observations of the Reaction between Calcium Oxide and Water

1. **Observation 1**: When solid calcium oxide (CaO) is mixed with water, a hissing sound is produced. This sound is due to the rapid reaction between calcium oxide and water.

2. **Observation 2**: The container or beaker in which the reaction occurs becomes hot. This is because the reaction is highly exothermic, releasing a significant amount of heat.

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