When FeCr_2O_4 is fused with Na_2CO_3 in the presence of air it gives a yellow solution of compound(A). Compound (A) on acidification gives comound (B). Compound (B) on reaction with KCl forms an orange coloured compound (C). An acidified solution of comound (C) oxidises Na_2SO_3 to (D). Identify (A), (B), (C) and (D).

 

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

4FeCr_2O_4+8Na_2CO_3+7O_2\rightarrow 8Na_2CrO_4+2Fe_2O_3+3CO_2

                                                                    Sodium Chronate

                                                                           (Yellow)

                                                                              (A) 

2Na_2Cr_2O_4+H_2SO_4(conc.)\rightarrow Na_2Cr_2O_7+Na_2SO_4+H_2O

                                                                 Sodium dichronate

                                                                         (B)

Na_2Cr_2O_7+2KCl\rightarrow K_2Cr_2O_7+2NaCl

                                                        (C)

K_2Cr_2O_7+4H_2SO_4+3Na_2SO_3\rightarrow K_2SO_4+Cr_2(SO_4)_3+4H_2O + 3Na_2SO_4

(C)                                                                                                           (D)

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