World of chemistry

Which gas is used in the manufacture of nitric acid by the Ostwald process?
A) Oxygen
B) Nitrogen
C) Ammonia
D) Hydrogen

Which metal is obtained from the ore Galena?
A) Zinc
B) Lead
C) Copper
D) Iron

Which gas is produced when dilute HCl reacts with sodium carbonate?
A) Hydrogen
B) Carbon dioxide
C) Oxygen
D) Chlorine

Which metal is commonly used in X-ray shielding?
A) Aluminium
B) Lead
C) Zinc
D) Copper

Which of the following is a neutral oxide?
A) CO
B) SO₂
C) CaO
D) Na₂O

Which gas is used for artificial ripening of fruits?
A) Oxygen
B) Ethylene
C) Nitrogen
D) Helium

Which compound is commonly known as Bleaching Powder?
A) CaOCl₂
B) CaCO₃
C) CaO
D) CaSO₄

Which alloy is used for soldering electrical wires?
A) Brass
B) Bronze
C) Solder (Lead + Tin)
D) Nichrome

Which of the following does NOT contain oxygen?

A) Hydrochloric acid (HCl)
B) Nitric acid (HNO₃)
C) Sulfuric acid (H₂SO₄)
D) Acetic acid (CH₃COOH)

Which gas is responsible for global warming the most among these?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium