Question

3. Which of the following is a
non-metal?
(a) Aluminium
(b) Oxygen
(c) Iron
(d) Silver​

Answer 1

Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a nonmetal? Explanation: Iron, Copper and aluminium are metals whereas coal is a non-metal hence answer is (d) piece of coal.

Answer 2

The Correct Solution is Option B, Oxygen.

• Oxygen is non-metal while Aluminium, Iron and Silver are metals.
• Oxygen O2 is a colourless, odourless, and tasteless gas.
• It is a  diatomic gas.
• In liq­uid form, oxygen is light blue in colour, but in sol­id form, it forms dark blue crystals.
• At a temperature of -218.7 degrees Cel­sius, oxygen melts.
• The nonmetallic chemical element oxygen (O) belongs to Group 16 of the periodic table.
• oxygen is particularly reactive and produces oxides with practically all other elements.
• At initially, there was no free oxygen in the Earth's atmosphere. It now exclusively includes free oxygen as a result of photosynthesis by green plants. The Byproduct of Photosynthesis is Oxygen.
• Ozone (O3) is an allotrope of oxygen that occurs naturally in the upper atmosphere of the Earth, especially the stratosphere which blocks the harmful UV radiations from the sun to reach the earth surface.