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NTS MCQs

National Testing Service — Complete MCQ Bank

1,084 Questions
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NTS tests evaluate aptitude, analytical reasoning, quantitative ability, English and subject knowledge for admissions, scholarships and recruitment.

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231
Chemistry Easy

What is the name of the process by which a liquid changes to a gas at its boiling point?

  • AVaporisation
  • BSublimation
  • CCondensation
  • DFreezing
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Correct Answer: Option A — Vaporisation
Explanation: Vaporisation is the process by which a liquid changes to a gas at its boiling point when sufficient thermal energy overcomes the intermolecular forces holding liquid molecules together.
Submitted by: PaperMCQs
232
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.
Submitted by: PaperMCQs
233
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.
Submitted by: PaperMCQs
234
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.
Submitted by: PaperMCQs
235
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.
Submitted by: PaperMCQs
236
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.
Submitted by: PaperMCQs
237
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.
Submitted by: PaperMCQs
238
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.
Submitted by: PaperMCQs
239
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.
Submitted by: PaperMCQs
240
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.
Submitted by: PaperMCQs
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