Question

Chlorine is liberated when we heat (a) KMnO4 + NaCl

Answer 1

K2Cr2O7 + conc.HCl →Cl2

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Answer 2

Hey !

Potassium dichromate  reacts with hydrochloric acid to evolve chlorine.

                                        K₂Cr₂O₇ + HCl

Now, let us balance the equation,

                K₂Cr₂O₇ + 14HCl ----> 2KCl + 2 CrCl₃ + 7H₂O + 3Cl₂

Good luck !!