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# The pair of chemicals used as food for yeast in the fermentation of molasses is :

$\begin {array} {1 1} (1)\;(NH_4)_2SO_4,Na_3PO_4 & \quad (2)\;(NH_4)_2SO_4,(NH_4)_3PO_4 \\ (3)\;Na_2SO_4, (NH_4)_3PO_4 & \quad (4)\;Na_2SO_4, Na_3PO_4 \end {array}$

(2) $(NH_4)_2SO_4, (NH_4)_3PO_4$