NCERT/Class 10/Science/Chemical Reactions and Equations

Chemical Reactions and Equations

Class 10 · Science

150 questions50 easy50 medium50 hard

Sample Questions

Q1.When magnesium burns in air, it forms magnesium oxide. Which type of reaction is this?

  • ADecomposition reaction
  • BCombination and oxidation reaction
  • CDisplacement reaction
  • DDouble displacement reaction

Q2.Paint is applied on iron articles to:

  • AMake them look attractive
  • BPrevent contact with moisture and oxygen
  • CMake them waterproof
  • DIncrease their weight

Q3.Why are oil and fat containing food items flushed with nitrogen?

  • ANitrogen adds flavour
  • BNitrogen prevents oxidation of fats and oils
  • CNitrogen preserves the colour
  • DNitrogen increases shelf life by killing bacteria

Q4.What visible sign indicates a precipitate has formed in a double displacement reaction?

  • AThe solution turns clear
  • BGas bubbles are seen
  • CAn insoluble solid settles or clouds the solution
  • DThe temperature drops sharply

Q5.Rusting of iron is an example of which type of chemical change?

  • ADecomposition reaction
  • BDisplacement reaction
  • CCorrosion
  • DRancidity

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

Balancing Chemical EquationsChemical EquationsChemical ReactionsCombination ReactionCorrosionDecomposition ReactionDisplacement ReactionDouble Displacement ReactionElectrolysisExothermic and Endothermic ReactionsOxidation and ReductionPrecipitation ReactionRancidityRedox ReactionsThermal Decompositionactivity seriesbalancing equationscatalystschemical equationschemical formulascombination reactioncombustionconcentrationcopper reactionscorrosiondecomposition reactiondisplacement reactiondouble displacementdouble displacement reactioneffect of temperatureelectrochemical reactionselectrolytic decompositionendothermic reactionsenergy in reactionsexothermic reactionsfactors affecting reaction rategalvanisationgas evolutionhalogen reactivityindicators of chemical reactioniron reactionslaw of conservation of massmetal carbonatesmole ratiosobservationsoxidationoxidation and reductionoxidation of fatsoxidation statesoxidising agentphotolysisphotosynthesisphysical vs chemical changeprecipitation reactionprevention of corrosionprevention of rancidityrancidityreactivityredox reactionsreducing agentrespirationrusting of ironsodium reactionssolubilitystate symbolsstoichiometrysymbols in equationstarnishing of silverthermal decompositiontypes of chemical reactions

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