[AIIMS 2002]
A) $ H_3PO_2 $
B) $ H_3PO_3 $
C) $ H_3PO_4 $
D) $ H_4P_2O_7 $
Correct Answer: C
$ K_2SO_4+2Na_2SO_4+\underset{\text{Chromyl chloride}}{\mathop{2CrO_2Cl_2+3H_2O}} $ it ionizes in three steps because three -OH groups are present.
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