Neet Solved Paper 2013 Question 21
Question: Which of the following does not give oxygen on heating?
Options:
A) $ KCl{O_3} $
B) $ \text{Zn(Cl}{O_3}{)_2} $
C) $ {K_2}C{r_2}{O_7} $
D) $ {{\text{(N}{H_4}\text{)}}_2}C{r_2}{O_7} $
Show Answer
Answer:
Correct Answer: D
Solution:
Oxygen rich compounds like chlorate; per chlorate $ K _2Cr _2O _7 $ etc., when heated gives oxygen but ammonium dichromate gives nitrogen gas when heated.
$ 2KClO _3\xrightarrow[{}]{\Delta }2KCl+3O _2\uparrow $ $ 2Zn{{(ClO _3)}_2}\xrightarrow[{}]{\Delta }ZnCl _2+3O _2 $ $ 4K _2CrO _7\xrightarrow[{}]{\Delta }4K _2CrO _4+2Cr _2O _3+3O _2\uparrow $ $ {{(NH _4)}_2}Cr _2O _7\xrightarrow[{}]{\Delta }N _2\uparrow +Cr _2O _3+4H _2O $
