CHEMISTRY

Which of this is a clear, tasteless and odourless water?

• H₂O

• CO₂

• NO₂

• KBr

Which of these gases do we breathe in?

• H₂O

• NH₃

• O₂

• H₂S

Which of these is a metal?

• Fe

• K

• C

• H

What is chemical formula for iron?

• Ir

• Rn

• Fe

• Ag

Which of these metals is normally liquid?

• Mercury

• Gold

• Iron

• Lead

Which of these elements is the hardest?

• Iron

• Gold

• Diamond

• Steel

At 100 degrees Celsius, water turns to ?

• Ice

• Mercury

• Steam

• Stone

What term is given to anything that has weight and occupies space?

• Fire

• Plasma

• Light

• Matter

Which of these gases is not present in the atmosphere?

• Carbon dioxide

• Nitrogen

• Hydrogen Sulphide

• Oxygen

What two gases combine to make water?

• Nitrogen and Helium

• Hydrogen and Argon

• Hydrogen and Nitrogen

• Hydrogen and Oxygen