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NTS MCQs

National Testing Service — Complete MCQ Bank

1,084 Questions
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201
Chemistry Medium

Which reaction type involves the breaking of a large molecule into smaller ones?

  • ASynthesis
  • BDisplacement
  • CDecomposition
  • DNeutralisation
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Correct Answer: Option C — Decomposition
Explanation: Decomposition reactions break down a single compound into two or more simpler substances often using heat electricity or light as in the thermal decomposition of calcium carbonate.
Submitted by: PaperMCQs
202
Chemistry Medium

Which type of hydrocarbon contains at least one carbon to carbon double bond?

  • AAlkane
  • BAlkyne
  • CAlkene
  • DArene
Permalink
Correct Answer: Option C — Alkene
Explanation: Alkenes are unsaturated hydrocarbons containing at least one carbon to carbon double bond making them more reactive than alkanes and important in polymer production.
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203
Chemistry Easy

What is the IUPAC name for the simplest hydrocarbon with formula CH4?

  • AEthane
  • BButane
  • CPropane
  • DMethane
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Correct Answer: Option D — Methane
Explanation: Methane CH4 is the simplest hydrocarbon and the first member of the alkane series where carbon atoms form single bonds and the molecule is saturated.
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204
Chemistry Medium

Which type of organic compounds contain only carbon and hydrogen atoms?

  • AHydrocarbons
  • BAlcohols
  • CCarbohydrates
  • DCarboxylic acids
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Correct Answer: Option A — Hydrocarbons
Explanation: Hydrocarbons are organic compounds containing only carbon and hydrogen atoms and include alkanes alkenes alkynes and aromatic compounds such as benzene.
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205
Chemistry Medium

What is the chemical formula for nitric acid used in fertiliser and explosive manufacturing?

  • AH2SO4
  • BHCl
  • CH3PO4
  • DHNO3
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Correct Answer: Option D — HNO3
Explanation: Nitric acid has the formula HNO3 and is a strong oxidising acid used in the production of fertilisers explosives and in metal etching processes.
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206
Chemistry Easy

What is the process by which plants use carbon dioxide and water to make glucose using sunlight?

  • ARespiration
  • BTranspiration
  • CPhotosynthesis
  • DDecomposition
Permalink
Correct Answer: Option C — Photosynthesis
Explanation: Photosynthesis uses sunlight to convert carbon dioxide and water into glucose and oxygen in the chloroplasts of plant cells following the equation 6CO2 plus 6H2O giving C6H12O6 plus 6O2.
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207
Chemistry Easy

Which noble gas is used in glowing advertising signs giving a reddish-orange colour?

  • AArgon
  • BHelium
  • CNeon
  • DKrypton
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Correct Answer: Option C — Neon
Explanation: Neon gas is used in neon signs and emits a characteristic reddish-orange glow when electricity passes through it due to the excitation of its electrons.
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208
Chemistry Easy

What is the chemical formula for ozone, the molecule that forms the protective layer in the stratosphere?

  • AO
  • BO2
  • CO3
  • DO4
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Correct Answer: Option C — O3
Explanation: Ozone has the chemical formula O3 consisting of three oxygen atoms and forms the stratospheric ozone layer that absorbs harmful UV radiation protecting life on Earth.
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209
Chemistry Medium

Which gas is responsible for the distinctive smell of rotten eggs?

  • AMethane
  • BHydrogen sulfide
  • CAmmonia
  • DSulfur dioxide
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Correct Answer: Option B — Hydrogen sulfide
Explanation: Hydrogen sulfide H2S is a colourless toxic gas responsible for the characteristic smell of rotten eggs and is produced by the bacterial decomposition of organic matter.
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210
Chemistry Easy

What is the chemical name for baking soda commonly used in cooking?

  • ASodium hydroxide
  • BSodium carbonate
  • CSodium chloride
  • DSodium bicarbonate
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Correct Answer: Option D — Sodium bicarbonate
Explanation: Baking soda is sodium bicarbonate NaHCO3 which releases carbon dioxide gas when heated or mixed with acid causing baked goods to rise during cooking.
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