A. Aluminium
B. Gold
C. Lead
D. Silver

A. Proton and neutron
B. 2 protons and 2 neutron
C. 3 protons and 2 neutrons
D. 4 protons only

A. Copper, silver, and zinc
B. Copper, nickel, and zinc

A. Acetic Acid
B. Hydrochloric Acid
C. Nitric Acid
D. Sulphuric Acid

A. Oxygen, iron, and potassium,
B. Oxygen, iron, and silicon
C. Silicon, aluminum, and oxygen
D. Silicon, iron, and magnesium

A. Mercury
B. Roting
C. Carbon
D. None of above

A. CO2
B. 02
C. SO2
D. NO2

A. An Alkalibase
B. Acid
C. Neutral
D. None

A. Helium
B. Nitrogen
C. Oxygen
D. Carbon dioxide

A. Aluminum
B. Oxygen
C. Nitrogen
D. Hydrogen