Chemistry

Problem

6 \times 10^{-3}

mole

\text{K}_2\text{Cr}_2\text{O}_7

reacts completely with

9 \times 10^{-3}

mole

X^{n+}

to give

\text{XO}_3^-

and

\text{Cr}^{3+}

. The value of

n

is .....