Explanation

• The old name of Nitrogen is Azote.
• This name, derived from the Greek word "azotikos" meaning "no life".
• It was given because nitrogen gas does not support respiration, making it inert or "lifeless" in this context.

Explanation

• Ozone (O3) in the stratosphere absorbs ultraviolet radiation from the Sun.
• It preventing excessive heat from reaching the Earth's surface.

Explanation

The charges of Proton, Electron, Neutron respectively are:

• Proton: Positive charge (+1)
• Electron: Negative charge (-1)
• Neutron: Neutral charge (0)

Explanation

• Crystallization is the process of obtaining a solid substance from a solution by allowing the solution to cool and form crystals.
• This process is used to purify substances and obtain a solid in a pure form.

Explanation

• Distillation is a process that involves boiling a liquid and then collecting the condensed steam.
• Which is free from many impurities, resulting in a purified liquid.
• This process is commonly used to purify water, alcohol, and other liquids.

Explanation

• Mixtures are physical combinations of two or more substances that are not chemically combined.
• The components of a mixture retain their chemical properties and can be separated by physical means.

Explanation

• Nitrogen (N2) is the most abundant constituent in air.
• Making up approximately 78% of the Earth's atmosphere.

The correct order of abundance:

• Nitrogen (N2) - 78%
• Oxygen (O2) - 21%
• Argon (Ar) - 0.93%
• Carbon Dioxide (CO2) - 0.04%

Explanation

A compound is a pure substance that contains only one type of molecule made up of atoms of more than one element.

Examples of compounds:

• Water (H2O) - Compound of Hydrogen and Oxygen
• Common salt (NaCl) - Compound of Sodium and Chlorine
• Washing soda (Na2CO3) - Compound of Sodium, Carbon, and Oxygen
• Carbon dioxide (CO2) - Compound of Carbon and Oxygen
  
• Sugar (C6H12O6) - Compound of Carbon, Hydrogen, and Oxygen

Explanation

The incorrect statement about non-metals is: Non-metals are solid at room temperature.

Non-metals are typically:

• Non-metal are gases
• Non-metals have low melting and boiling point
• Non-metal are poor conductor of heat and electricity
• Non-metal are dull and soft

Explanation

• Aluminium, Magnesium, and Iron are all metals that are commonly used in construction and building materials.
• Including in the manufacture of cars, bridges, and houses.