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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

96 Questions
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PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

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41
Chemistry Hard

Which type of isomerism involves compounds with the same molecular formula but different structural arrangements?

  • AStructural isomerism
  • BOptical isomerism
  • CGeometric isomerism
  • DDynamic isomerism
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Correct Answer: Option A — Structural isomerism
Explanation: Structural isomers have the same molecular formula but different connectivity of atoms leading to different structural arrangements and distinct physical and chemical properties.
Submitted by: PaperMCQs
42
Chemistry Medium

What does Avogadro's number represent?

  • ANumber of atoms in 1 gram of hydrogen
  • BNumber of particles in one mole of a substance
  • CNumber of molecules in 1 litre of gas
  • DNumber of protons in a nucleus
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Correct Answer: Option B — Number of particles in one mole of a substance
Explanation: Avogadro's number is approximately 6.022 x 10 to the power 23 and represents the number of atoms molecules or ions contained in one mole of any substance.
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43
Chemistry Easy

What is the chemical formula for hydrogen peroxide commonly used as an antiseptic?

  • AH2O2
  • BH2O
  • CH3O2
  • DHO2
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Correct Answer: Option A — H2O2
Explanation: Hydrogen peroxide H2O2 is a pale blue liquid used as an antiseptic bleaching agent and rocket propellant differing from water by having an extra oxygen atom.
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44
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.
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45
Chemistry Medium

What is the general formula of alkanes where n is the number of carbon atoms?

  • ACnH2n
  • BCnH2n+2
  • CCnHn
  • DCnH2n-2
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Correct Answer: Option B — CnH2n+2
Explanation: Alkanes follow the general formula CnH2n plus 2 where each carbon forms four single bonds and the molecule is fully saturated with hydrogen atoms.
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46
Chemistry Medium

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

  • AAlkane
  • BAlkyne
  • CAlkene
  • DArene
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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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47
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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48
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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49
Chemistry Hard

What are the products of the electrolysis of brine sodium chloride solution?

  • ASodium and water
  • BHydrogen chlorine and sodium hydroxide
  • CChlorine and sodium
  • DSodium chloride and water
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Correct Answer: Option B — Hydrogen chlorine and sodium hydroxide
Explanation: Electrolysis of brine produces hydrogen gas at the cathode chlorine gas at the anode and sodium hydroxide solution remaining in the electrolyte through the chlor-alkali process.
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50
Chemistry Medium

Which process involves passing an electric current through a solution to cause a chemical reaction?

  • AElectrolysis
  • BDistillation
  • CChromatography
  • DFiltration
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Correct Answer: Option A — Electrolysis
Explanation: Electrolysis passes an electric current through an electrolyte solution or molten ionic compound causing chemical reactions at the electrodes and is used to extract metals and plate surfaces.
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