Q11. What is the main gas in LPG?
Correct: Butane
LPG mainly contains butane and propane.
Q12. Which compound is known as baking soda?
Correct: NaHCO3
Baking soda is sodium bicarbonate.
Q13. What is the atomic number of oxygen?
Correct: 8
Oxygen has 8 protons.
Q14. Which acid is found in lemons?
Correct: Citric acid
Lemons contain citric acid.
Q15. What is rust chemically?
Correct: Iron oxide
Rust is hydrated iron oxide.
Q16. Which gas is used in balloons?
Correct: Helium
Helium is lighter than air and non-flammable.
Q17. What is the chemical name of washing soda?
Correct: Sodium carbonate
Washing soda is sodium carbonate.
Q18. Which element has the symbol Fe?
Correct: Iron
Fe is the symbol for iron.
Q19. What is the lightest element?
Correct: Hydrogen
Hydrogen is the lightest element.
Q20. Which metal is used in galvanization?
Correct: Zinc
Zinc coating prevents rusting.
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