IIT-JEE Exam

The total number of diprotic acids among the following is
H3PO4 H2SO4 H3PO3 H2CO3 H2S2O7
H3BO3 H3PO2 H2CrO4 H2SO3

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IIT-JEE Other Question

Among the following, the number of elements showing only one non-zero oxidation state is
O, Cl, F, N, P, Sn, Tl, Na, Ti Total number of geometrical isomers for the complex [RhCl(CO)(PPh3)(NH3)] is