1.
The equivalent weight of KIO3KIO_3 in the given reaction is (MM = molecular mass):
2Cr(OH)3+4OH−+KIO3→2CrO42−+5H2O+KI2Cr(OH)_3 + 4OH^- + KIO_3 \rightarrow 2CrO_4^{2-} + 5H_2O + KI