KVPY SA Exam 2016 Question Paper

Question : 31 of 80

Marks: +1, -0

Part-1 Chemistry

One mole of one of the sodium salts listed below, having carbon content close to 14.3% produces 1 mole of carbon dioxide upon heating (atomic mass Na = 23, H = 1, C = 12, O = 16). The salt is

$C_2H_5COONa$
$NaHCO_3$
HCOONa
$CH_3COONa$

Validate

Solution:

2\NaOH_3→↖{\Δ}\Na_2\CO_3

+H_2O+\CO_2

% of C

=12/84×100=14.28%

This Question can be done by checking % of carbon 14.2% comes only in

NaHCO_3

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