Q59 / 270 · NDA 2017 (Phase 1) · General Ability

Which one of the following elements is least reactive with water?

Correct answer
A
Lithium
B
Sodium
C
Potassium
D
Cesium

Solution

Lithium reacts intensely with water, forming lithium hydroxide and highly flammable hydrogen. The colourless solution is highly alkalic. The exothermal reactions lasts longer than the reaction of sodium and water.

Hence, the correct answer is option: 'A'.

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