Materials Metals and Non Metals Test - 4

Iodine is a non-metal which is used to make the purple-coloured solution called tincture iodine which is applied on cuts and wounds as an antiseptic.

Chlorine is the chemical most often used to keep swimming pools free of bacteria that can be hazardous to humans.

Magnesium in plants is located in the enzymes, in the heart of the chlorophyll molecule. Without magnesium, chlorophyll cannot capture sun energy needed for photosynthesis.

A chemical property is any of a material's properties that become evident during, or after, a chemical reaction.

Malleability, Ductility, Lustre are all physical properties. The only reaction with oxygen involves a chemical reaction. Hence, D is the correct answer.

Metals generally do not react with acids, but metals react with acids and produce hydrogen gas that burns with a ‘pop’ sound. Hence, B is the correct answer.

Generally, non-metals do not react with water though they may be very reactive in air. Such non-metals are stored in water. For Example, phosphorus is a very reactive non-metal. It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. Hence, B is the correct answer.

When sulphur dioxide is dissolved in water, sulphurous acid is formed. The reaction can be given as follows:

SO₂ + H₂O → H₂SO₃

Hence, B is the correct answer.

Zinc is more reactive than copper and iron. A more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal. Hence, B is the correct answer.