Chemical Effects of Electric Current Test - 6

Tin, being less reactive than iron, is used for coating cans meant for storing food items.

To protect iron from corrosion and rust, it is coated with zinc.

Zinc can be better than tin for protecting iron from rusting because, zinc being highly electropositive can prevent rusting even when the layer is broken.

An LED glows even when a weak electric current flows through it.

Vinegar is a good conductor of electricity. Hence, X is vinegar.

In a cell, by convention, charge is taken to be flowing from positive electrode to negative electrode.

In metals, the attractive force on outermost electrons towards nucleus is feeble due to which they become free from atom when they get a little energy from outside. Such electrons are free to move anywhere inside the metal, but they are not free to move outside the metal.

Cans used for storing soft drinks or food items are usually electroplated with tin because tin is less reactive than the base metal with which the can is made of. Tin does not contaminate the food or soft drink. It also does not get corroded.

Anions move towards anode as they are negatively charged.

A bulb does not glow when the probes are hanging in air, because air is a bad conductor of electricity.

Since, tin is less reactive than iron, iron vessels are coated with tin to prevent rusting. Thus, food does not come into contact with iron and is protected from getting spoiled.

Electroplating is the process of depositing a layer of a desired metal on another material by passing electric current.

Acids are good conductors of electricity. Most of the liquids which conduct electricity are solutions of acids, bases and salts.