1.

Which of the following statements(s) is (are) correct when a mixture of NaCl and K_(2)Cr_2 O_7, is gently warmed with concentrated H_2 SO_4?

Answer»

A DEEP red vapour is EVOLVED.
The vapours when PASSED into NaOH solution gives a yellow solution of `Na_2 CrO_4`
Chlorine gas is evolved.
Chromyl chloride is formed.

Solution :`4NaCl + K_(2) Cr_(2) O_(7) + 6 H_(2) SO_(4) to underset("(Red vapours)") underset("(chromyl chloride)") (2 CrO_(2) Cl_(2)) + 4 NaHSO_(4) + 2 KHSO_4 + 3 H_2O`
`underset("(red vapours)")(CrO_(2) Cl_(2)) + 4 NaOH to underset("(yellow solution)") (Na_2 CrO_4 + 2) NACL + 2 H_(2)O`


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