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NTS MCQs

National Testing Service — Complete MCQ Bank

63 Questions
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51
Chemistry Medium

Which particle determines the chemical properties of an element?

  • ANeutron
  • BElectron
  • CProton
  • DNucleus
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Correct Answer: Option B — Electron
Explanation: Electrons especially the valence electrons in the outermost shell determine the chemical properties of an element including its reactivity bonding behaviour and the compounds it forms.
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52
Chemistry Easy

Which gas has the chemical formula CO2?

  • ACarbon dioxide
  • BCarbon monoxide
  • CSulfur dioxide
  • DNitrogen dioxide
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide with the formula CO2 consists of one carbon atom double bonded to two oxygen atoms and is a major greenhouse gas produced by combustion and respiration.
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53
Chemistry Easy

What is the atomic number of oxygen?

  • A6
  • B10
  • C8
  • D16
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Correct Answer: Option C — 8
Explanation: Oxygen has an atomic number of 8 meaning it has 8 protons in its nucleus and typically 8 electrons in its neutral form with an electronic configuration of 2,6.
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54
Chemistry Medium

Which law states that matter can neither be created nor destroyed in a chemical reaction?

  • ALaw of Definite Proportions
  • BLaw of Multiple Proportions
  • CLaw of Conservation of Mass
  • DLaw of Combining Volumes
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Correct Answer: Option C — Law of Conservation of Mass
Explanation: The Law of Conservation of Mass proposed by Lavoisier states that the total mass of reactants equals the total mass of products in any chemical reaction.
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55
Chemistry Easy

What is the chemical formula for sulfuric acid?

  • AH2SO4
  • BHNO3
  • CHCl
  • DH3PO4
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Correct Answer: Option A — H2SO4
Explanation: Sulfuric acid has the chemical formula H2SO4 and is one of the most important industrial chemicals used in fertiliser production batteries and various chemical processes.
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56
Chemistry Medium

Which type of bond involves the complete transfer of electrons from one atom to another?

  • ACovalent bond
  • BIonic bond
  • CMetallic bond
  • DHydrogen bond
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Correct Answer: Option B — Ionic bond
Explanation: An ionic bond involves the complete transfer of one or more electrons from a metal atom to a non-metal atom creating oppositely charged ions that attract each other electrostatically.
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57
Chemistry Easy

What is the pH of pure water at 25 degrees Celsius?

  • A5
  • B9
  • C7
  • D14
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Correct Answer: Option C — 7
Explanation: Pure water has a pH of exactly 7 at 25 degrees Celsius making it neutral as it contains equal concentrations of hydrogen and hydroxide ions.
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58
Chemistry Easy

Which element is the most abundant in the universe?

  • AHydrogen
  • BHelium
  • CCarbon
  • DOxygen
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Correct Answer: Option A — Hydrogen
Explanation: Hydrogen is the most abundant element in the universe making up approximately 75 percent of all normal matter by mass and is the primary fuel for nuclear fusion in stars.
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59
Chemistry Easy

What is the chemical formula for common table salt?

  • AKCl
  • BCaCl2
  • CMgCl2
  • DNaCl
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Correct Answer: Option D — NaCl
Explanation: Common table salt has the chemical formula NaCl or sodium chloride formed from the ionic bond between positively charged sodium ions and negatively charged chloride ions.
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60
Chemistry Easy

Which gas is produced when an acid reacts with a metal?

  • AOxygen
  • BHydrogen
  • CNitrogen
  • DCarbon dioxide
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Correct Answer: Option B — Hydrogen
Explanation: When acids react with metals hydrogen gas is produced along with a salt for example zinc reacting with hydrochloric acid produces zinc chloride and hydrogen gas.
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