WBJEE · Chemistry · d and f Block Elements
The orange solid on heating gives a colourless gas and a green solid which can be reduced to metal by aluminium powder. The orange and the green solids are, respectively
- A \(\mathrm{NH}_{4} \mathrm{Cr}_{2} \mathrm{O}_{7}\) and \(\mathrm{Cr}_{2} \mathrm{O}_{3}\)
- B \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) and \(\mathrm{Cr}_{2} \mathrm{O}_{3}\)
- C \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) and \(\mathrm{CrO}_{3}\)
- D \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CrO}_{4}\) and \(\mathrm{CrO}_{3}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) and \(\mathrm{Cr}_{2} \mathrm{O}_{3}\)
Step-by-step Solution
Detailed explanation
Orange solid is ammonium dichromate. \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow} \mathrm{N}_{2} \uparrow+\mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O}\)…
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