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NTS MCQs

National Testing Service — Complete MCQ Bank

63 Questions
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31
Chemistry Medium

What is the chemical formula for rust formed on iron?

  • AFe2O
  • BFe3O4
  • CFeO
  • DFe2O3
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Correct Answer: Option B — Fe3O4
Explanation: Rust is hydrated iron oxide with the formula Fe2O3 nH2O formed when iron reacts with oxygen and moisture through an electrochemical oxidation process.
Submitted by: PaperMCQs
32
Chemistry Easy

What is the chemical symbol for silver?

  • ASi
  • BAg
  • CSr
  • DSn
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Correct Answer: Option B — Ag
Explanation: The chemical symbol for silver is Ag derived from the Latin word Argentum and silver is a precious metal with the highest electrical and thermal conductivity of all metals.
Submitted by: PaperMCQs
33
Chemistry Easy

Which acid is present in the human stomach to aid digestion?

  • ASulfuric acid
  • BNitric acid
  • CAcetic acid
  • DHydrochloric acid
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Correct Answer: Option D — Hydrochloric acid
Explanation: Hydrochloric acid HCl is secreted by the stomach lining to aid protein digestion by activating pepsin and also kills most bacteria ingested with food.
Submitted by: PaperMCQs
34
Chemistry Medium

What is the chemical formula for calcium carbonate found in limestone and chalk?

  • ACaSO4
  • BCa(OH)2
  • CCaCl2
  • DCaCO3
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Correct Answer: Option D — CaCO3
Explanation: Calcium carbonate CaCO3 is the main component of limestone chalk and marble and is also found in shells of marine organisms and is used in construction and as an antacid.
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35
Chemistry Easy

What is the chemical name of NaOH?

  • ASodium chloride
  • BSodium carbonate
  • CSodium bicarbonate
  • DSodium hydroxide
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Correct Answer: Option D — Sodium hydroxide
Explanation: NaOH is sodium hydroxide also known as caustic soda a strong base used in soap making paper production and as a drain cleaner due to its highly alkaline properties.
Submitted by: PaperMCQs
36
Chemistry Easy

Which type of reaction involves an acid reacting with a base to form salt and water?

  • ADecomposition
  • BRedox
  • CNeutralisation
  • DPrecipitation
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Correct Answer: Option C — Neutralisation
Explanation: Neutralisation is the reaction between an acid and a base producing salt and water for example hydrochloric acid reacting with sodium hydroxide to form sodium chloride and water.
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37
Chemistry Easy

What is the chemical formula for methane, the main component of natural gas?

  • AC2H6
  • BCH4
  • CC3H8
  • DC2H4
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Correct Answer: Option B — CH4
Explanation: Methane has the chemical formula CH4 consisting of one carbon atom bonded to four hydrogen atoms and is the simplest alkane and the primary component of natural gas.
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38
Chemistry Medium

Which gas is used in fire extinguishers to smother flames by displacing oxygen?

  • ACarbon dioxide
  • BNitrogen
  • COxygen
  • DWater vapour
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide is used in fire extinguishers because it displaces oxygen around flames extinguishing the fire without leaving corrosive residue making it ideal for electrical fires.
Submitted by: PaperMCQs
39
Chemistry Medium

What is the name of the vertical columns in the periodic table?

  • APeriods
  • BBlocks
  • CGroups
  • DRows
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Correct Answer: Option C — Groups
Explanation: Groups are the vertical columns in the periodic table and elements in the same group have the same number of valence electrons giving them similar chemical properties and reactivity.
Submitted by: PaperMCQs
40
Chemistry Medium

What is the name of the horizontal rows in the periodic table?

  • AGroups
  • BBlocks
  • CPeriods
  • DFamilies
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Correct Answer: Option C — Periods
Explanation: Periods are the horizontal rows in the periodic table and elements in the same period have the same number of electron shells with properties changing systematically across each period.
Submitted by: PaperMCQs
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