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:

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Solution

The correct option is D Na
Sodium is a highly reactive metal and catches fire easily when exposed to water and can be cut with a knife easily.
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2} + H e a t$

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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:

The correct option is D NaSodium is a highly reactive metal and catches fire easily when exposed to water and can be cut with a knife easily. 2Na+2H2O → 2NaOH+H2+ Heat

The correct option is D Na
Sodium is a highly reactive metal and catches fire easily when exposed to water and can be cut with a knife easily.
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2} + H e a t$