Which of the following is not an application of the chemical effect of electric current?

Non-metals are generally non-conductors of electricity. The non-metal whose one of the forms can be used to make electrodes in electrolysis experiments is:

The decomposition produced by passing current through a conducting liquid is called:

One of the following is not used for electroplating metal articles. This one is :

An arrangement having two carbon rods kept in a conducting liquid in a vessel is known as: