Analytical Chemistry Question 291
Question: When a mixture of solid $ NaCl, $ solid $ K_2Cr_2O_7 $ is heated with conc. $ H_2SO_4, $ orange red vapours are obtained of the compound
[CPMT 1974, 78, 81, 88; DPMT 1983, 89; NCERT 1977; AFMC 1982; AMU 1984]
Options:
A) Chromous chloride
B) Chromyl chloride
C) Chromic chloride
D) Chromic sulphate
Show Answer
Answer:
Correct Answer: B
Solution:
$ NaCl+H_2SO_4\to NaHSO_4+HCl $
$ K_2Cr_2O_7+2H_2SO_4\to 2KHSO_4+2CrO_3+H_2O $
$ CrO_3+2HCl\to \underset{\text{(orange }\text{red vapour)}}{\mathop{CrO_2Cl_2}} $
BETA
