\( 200 \, \text{cc} \) of \( x \times 10^{-3} \, \text{M} \) potassium dichromate is required to oxidise \( 750 \, \text{cc} \) of \( 0.6 \, \text{M} \) Mohr’s salt solution in acidic medium. Here \( x = \) __________.
