KVPY SA Exam 2012 Question Paper

Question : 31 of 80

Marks: +1, -0

CHEMISTRY

The weight of calcium oxide formed by burning 20 g of calcium in excess oxygen is

Solution:

Ca+1/2O_2→CaO

Ca=20/40=1/2\moles

CaO formed

=1/2\moles

w=1/2×56=28\gm

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