Question
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:
- Mg
- Na
- P
- Ca
Explanation: Sodium (Na) gives all the characteristics of the element X.
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$\text{CaCO}_3(\text{s})\xrightarrow{\text{x}}\text{CaO}(\text{s})+\text{CO}_2(\text{g})$