Which of the following is the least reactive alkali metal?
Correct answer: C. Sodium
- A. Rubidium
- B. Potassium
- C. Sodium
- D. Cesium
Explanation
Options A, B and D are incorrect as Na is the uppermost element in alkali metals and down the group, electropositive character or metallic character increases so according to this trend, Na is least metallic while other peers of its group have increasing metallic character as we progress down the group. Hence only option C is correct.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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