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JEE Main 20163 April
Exam
JEE Main
Year
2016
Date
3 April
Subject
Chemistry
Chapter
s Block Elements

JEE Main 2016 · 3 April · Chemistry · s Block Elements

The main oxides formed on combustion of Li, Na and K in excess of...

The main oxides formed on combustion of Li, Na and K in excess of air are respectively:

Options

  1. ALi2O2,Na2O2andKO2L{i}_{2}{O}_{2}, N{a}_{2}{O}_{2}andK{O}_{2}
  2. BLi2O,Na2O2andKO2L{i}_{2}O, N{a}_{2}{O}_{2}andK{O}_{2}
  3. CLi2O,Na2OandKO2L{i}_{2}O, N{a}_{2}OandK{O}_{2}
  4. DLiO2,Na2O2andK2OLi{O}_{2}, N{a}_{2}{O}_{2}and{K}_{2}O

Correct answer

B. Li2O,Na2O2andKO2L{i}_{2}O, N{a}_{2}{O}_{2}andK{O}_{2}

Step-by-step solution

In 1A group

Li on reaction with excess air

4Li+O2→2Li2O4Li + {O}_{2} \to 2L{i}_{2}O

Na on reaction with excess air

2Na+O2→Na2O22Na + {O}_{2} \to N{a}_{2}{O}_{2}

K on reaction with excess air

K+O2→KO2K + {O}_{2} \to K{O}_{2}
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