NCERT/Class 9/Science/Atoms and Molecules

Atoms and Molecules

Class 9 · Science

54 questions18 easy24 medium12 hard

Sample Questions

Q1.According to the law of conservation of mass, what can be said?

  • AMass is neither created nor destroyed in a chemical reaction
  • BMass always increases in reactions
  • CMass always decreases in reactions
  • DMass is converted to energy

Q2.How many atoms are present in H2SO4 molecule?

  • A7
  • B5
  • C11
  • D4

Q3.Which particle has negligible mass?

  • AElectron
  • BProton
  • CNeutron
  • DAlpha particle

Q4.What is the molar mass of methane (CH4)?

  • A16 g/mol
  • B14 g/mol
  • C18 g/mol
  • D12 g/mol

Q5.What is the mass percentage of carbon in CO2?

  • A27.27%
  • B72.73%
  • C50%
  • D33.33%

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

AmmoniaAnionsAtomic MassAtomic Mass UnitAtomic NumberAtomic StructureAtomsAvogadro's NumberBenzeneCalcium OxideCalculationsCarbon DioxideCationsChemical BondingChemical FormulasChlorineCompoundsCounting AtomsDalton's TheoryDiatomic MoleculesElectron ChargeElectron ShellsElectron TransferElectronic ConfigurationElectronsElementsEmpirical FormulaFundamental ConstantsGas LawsHistory of ChemistryIonic BondingIonic CompoundsIonsIsobarsIsotopesLaws of Chemical CombinationMassMass ConservationMass NumberMass PercentageMeasurementMethaneMolar MassMolar VolumeMolecular FormulaMolecular FormulasMoleculesMolesNitrogen CompoundsOxygenOxygen GasPercent CompositionPeriodic TablePolyatomic IonsRadicalsRadiocarbon DatingRatiosSTPShell CapacitySignificant FiguresSodiumSodium ChlorideSubatomic ParticlesSulfate IonValence ElectronsValencyWater

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