Q41. What is the atomic number of nitrogen?
Correct: 7
Nitrogen has 7 protons.
Q42. Which metal is extracted from bauxite?
Correct: Aluminum
Aluminum is extracted from bauxite.
Q43. What is the chemical formula of methane?
Correct: CH4
Methane is CH4.
Q44. Which gas is called noble gas?
Correct: Helium
Helium is a noble gas.
Q45. What is the pH of an acid?
Correct: Less than 7
Acids have pH less than 7.
Q46. Which element is used in nuclear reactors as fuel?
Correct: Uranium
Uranium is used as nuclear fuel.
Q47. What is the chemical symbol of silver?
Correct: Ag
Silver is represented by Ag.
Q48. Which gas is responsible for the greenhouse effect?
Correct: Carbon dioxide
CO2 traps heat in the atmosphere.
Q49. What is the chemical name of caustic soda?
Correct: Sodium hydroxide
Caustic soda is sodium hydroxide.
Q50. Which element is liquid at room temperature besides mercury?
Correct: Bromine
Bromine is also liquid at room temperature.
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