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JEE Main 201219 MayOnline
Exam
JEE Main
Year
2012
Date
19 May
Mode
Online
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2012 · 19 May · Online · Chemistry · Classification of Elements and Periodicity in Properties

Which one of the following will react most vigorously with water?

Which one of the following will react most vigorously with water?

Options

  1. ALi\mathrm{Li}
  2. BK\mathrm{K}
  3. CRb\mathrm{Rb}
  4. DNa\mathrm{Na}

Correct answer

C. Rb\mathrm{Rb}

Step-by-step solution

Reactivity with water increases on moving down the Goup from Li\mathrm{Li} to Cs\mathrm{Cs} as Li<Na\mathrm{Li} < \mathrm{Na} <K<Rb<Cs< \mathrm{K} < \mathrm{Rb} < \mathrm{Cs}. This is due to increase in electropositive character. Hence Rb reacts most vigorously with water.
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