Adirect-current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. a chemist suggests that the power supply terminals be connected to a pair of platinum electrodes that dip into 0.1-molar ki solution. which of the following correctly identifies the polarities of the power supply terminals?

(a) a gas will be evolved only at the positive electrode.
(b) a gas will be evolved only at the negative electrode.
(c) a brown color will appear in the solution near the negative electrode.
(d) a metal will be deposited on the positive electrode.
(e) none of the methods above will identify the polarities of the power supply terminals.