The electrode through which current enters the electrolytic cell is:
A) Anode
B) Nickel metal
C) Ammonium hydroxide
D) Cathode

Hint:To answer the question we need to know about what is anode and what is cathode and the differences between cathode and anode. The terms anode and cathode are not characterized by the voltage extremity of terminals but the course of current through the terminal. An anode is a terminal through which an ordinary current (positive charge) streams into the device from an outer circuit, while a cathode is a terminal through which traditional current streams out of the device.


Complete step by step answer:
An anode is a terminal through which the customary current goes into an enraptured electrical device. This differences from a cathode, a terminal through which a traditional flow leaves an electrical device. A typical memory aide is ACID, for "anode current into the device". The heading of customary current (the progression of positive charges) in a circuit is inverse to the course of the electron stream, so (adversely charged) electrons stream out the anode of a galvanic cell, into an outside or outer circuit associated with the cell.
 In both a galvanic cell and an electrolytic cell, the anode is the cathode at which the oxidation response happens. In an electrolytic cell, the anode is the wire or plate having an abundance positive charge. Consequently, anions will in the general move towards the anode where they can go through oxidation.
Truly, the anode has additionally been known as the zincode.
So, the electrode through which the current enters the electrolytic cell is an anode.

Hence,the correct option is A.

Note: The terms anode and cathode are not characterized by the voltage extremity of terminals yet the bearing of current through the terminal. An anode is a terminal through which an ordinary current (positive charge) streams into the device from an outside circuit, while a cathode is an anode through which regular current streams out of the device. On the off chance that the current through the terminals switches heading, as happens for instance in a battery-powered battery when it is being charged, the naming of the anodes as anode and cathode is turned around.