Transition and InnerTransition Elements - Result Question 147

####47. Which of the following statement(s) is/are correct when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4 ?

(1998,2M) (b) Vapours when passed into NaOH solution gives a yellow solution of Na2CrO4

(c) Chlorine gas is evolved

(d) Chromyl chloride is formed

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Answer:

Correct Answer: 47. (a,b,d)

Solution:

  1. 4NaCl+K2Cr2O7+6H2SO42CrO2Cl2 Chromyl chloride  Chromyl chloride (red vapour)

+4NaHSO4+2KHSO4+3H2O

CrO2Cl2+4NaOHNa2CrO4+2NaCl+2H2O yellow solution



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