MCQ
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
- AMg
- BS
- CP
- DNa
Explanation:
Na is soft and can be cut with a knife. It is very reactive and cannot be kept in open air. It reacts vigorously with water.
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$\text{Mg(s)}\ +\ \text{CuO(s)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{MgO(s)}\ +\ \text{Cu(s)}$
This equation represents:$\text{CaCO}_3(\text{s})\xrightarrow{\text{x}}\text{CaO}(\text{s})+\text{CO}_2(\text{g})$