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Which of the following is true regarding the reactivity of alkali metals towards a particular halogen?

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Which of the following is true regarding the reactivity of alkali metals towards a particular halogen?

(a) Rubidium is greater than that of sodium

(b) Sodium is greater than that of lithium

(c) Lithium is greater than that of rubidium

(d) Rubidium is greater than that of cesium

This question was posed to me in unit test.

The above asked question is from s-Block Elements in section s-Block Elements of Chemistry – Class 11

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Right answer is (a) Rubidium is greater than that of sodium

For explanation: Alkali metals combine readily with halogens to form ionic halides. The reactivity order of alkali metals towards a particular halogen increase in the order; lithium, sodium, potassium, rubidium, and cesium.

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