Chemistry

Problem

Sodium chromate,

\text{Na}_2\text{CrO}_4

is made commercially by : a. heating mixture of

\text{Cr}_2\text{O}_3

and

\text{Na}_2\text{CO}_3

b. heating mixture of chromite ore and sodium carbonate in the presence of oxygen c. heating sodium dichromate with sodium carbonate d. reacting

\text{NaOH}

with chromic acid