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Radhika Batra Grade: 11
Which of the following statement(s) is (are) correct when a mixture of NaCI and K base 2Cr base 2O base 7 is gently warmed with conc H base 2SO base 4?
a. A deep red vapour is evolved
b. The vapours when passed into NaOH solution gives a yellow solution of Na base 2CrO base 4
c. Chlorine gas is evolved
d. Chromyl chloride is formed
3 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points

(a,b,c) The reactions are

4NaCI + K base 2Cr base 2O base 7 +6H base 2SO base 4

?2CrO base 2CI base 2 + 4NaHSO base 4 +2KHSO base 4 + 3H base 2O

(Red vapours)

CrO base 2CI base 2 +4NaOH ? Na base 2CrO base 4 +2NaCI + 2H base 2O

Chromyl yellow

Chloride solution

3 years ago
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