First slide

Transition elements

Question

When chromite ore is heated with $N a_{2} C O_{3}$ powder in the presence of air

Moderate

A

One gaseous product is formed
B

one product is water insoluble which is dark brown in colour
C

one product is water soluble which is red in colour
D

one product is water soluble which is yellow in color

Solution

$F e C r_{2} O_{4} + N a_{2} C O_{3} \to_{Δ}^{O_{2}} \underset{\underset{\underset{H_{2} O}{S o l i n}}{Y e l l o w}}{N a_{2} C r O_{4}} + \underset{(B r o w n)}{F e_{2} O_{3}} + C O_{2} ↑$

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