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JEE Main 20127 MayOnline

Exam: JEE Main
Year: 2012
Date: 7 May
Mode: Online
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2012 · 7 May · Online · Chemistry · p Block Elements (Group 13 & 14)

Which of the oxide groups among the following cannot be reduced by...

Which of the oxide groups among the following cannot be reduced by carbon?

Options

A $\mathrm{Cu}_2 \mathrm{O}, \mathrm{SnO}_2$
B $\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$
C $\mathrm{PbO}, \mathrm{Fe}_2 \mathrm{O}_4$
D $\mathrm{Fe}_2 \mathrm{O}_3, \mathrm{ZnO}$

Correct answer

B. $\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$

Step-by-step solution

\mathrm{Ca}

and

\mathrm{K}

are strong reducing agents, hence their oxides can not be reduced with carbon.

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