The dand fblock elements - Result Question 53
####53. On heating chromite $(FeCr_2 O_4)$ with $Na_2 CO_3$ in air, which of the following product is obtained?
[1999]
(a) $Na_2 Cr_2 O_7$
(b) $FeO$
(c) $Fe_3 O_4$
(d) $Na_2 CrO_4$
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Solution:
- (d) Byheating chromite with $Na_2 CO_3, Na_2 CrO_4$ is obtained
$ \begin{aligned} 4 FeCr_2 O_4+8 Na_2 CO_3+7 O_2 \longrightarrow \\ 8 Na_2 CrO_4+2 Fe_2 O_3+8 CO_2 \end{aligned} $
