Molybdate reagent is used for estimation of

Answer: Option B

Molybdate is a compound containing an oxoanion with molybdenum in its highest oxidation state of 6. Iron molybdate catalyst is a combination of the two oxides that produce the desired active and selective catalyst.
The molybdate reagent is a solution containing both the molybdate and vandate ions. It is commonly used in the determination of Phosphate ion content.