Quiz  /  Chemical Reactions Class 12 MCQ Questions With Answers

  • 1. 
    The word oxidation describes

  • gain of electrons
  • loss of electrons
  • number of electrons remains the same
  • number of electrons transfered

  • 2. 
    Provides evidence that a chemical reaction has occurred.

  • dissolving
  • melting
  • formation of a gas
  • bending

  • 3. 
    Which half reaction shows the element being reduced. In the following reaction. 2Na + Cl2 --> 2NaCl

  • Na0   --> Na+1   +   1e-
  • Cl20  +  2e-  --> 2Cl-
  • Na0  +  1e- --> Na+1
  • Cl20 --> 2Cl-  + 2e-

  • 4. 
    What is the probable product of a double-replacement reaction?

  • A new compound and a replaced metal
  • A new compound and a replaced nonmetal
  • 2 different compounds 1 aqueous and 1 that is a solid, liquid or gas
  • A single compound

  • 5. 
    A chemical reaction that shows the formation of a solid and identifies the spectator ions

  • net ionic equation
  • double replacement
  • ionic equation
  • dissociation

  • 6. 
    Which reaction between halogens and halide salts will occur?

  • F2(g)  +  FeI2(aq) → FeF2(aq)  +  I2 (g)
  • Cl2(g) + SrF2(aq)  → SrCl2(aq)  +  F2(g)
  • I2(g)  + MgBr2(aq)  → MnI2(aq)  + Br2(g)
  • Br2(l)  +  CoCl2(aq) → CoBr2(aq)  +  Cl2(g)

  • 7. 
    A compound is reacted and forms two new substances. What type of reaction is this?

  • combustion
  • synthesis
  • decomposition
  • single replacement

  • 8. 
    Predict the following reaction NaCl + Ca(NO3)2 -->

  • no reaction both products are aqueous
  • Calcium chloride and sodium nitrate are produced
  • sodium nitrate is a solid formed
  • calcium chloride is the solid formed

  • 9. 
    Describes the number of molecules in a compound and is used to balance a chemical reaction.

  • coefficient
  • subscript
  • superscript
  • SI unit

  • 10. 
    Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?

  • double replacement
  • decomposition
  • combustion
  • single replacement

  • 11. 
    Which is the name of the kind of solid substance formed in this figure?

  • aqueous
  • precipitate
  • acid
  • synthesis

  • 12. 
    The word reduction describes

  • gain of electrons
  • loss of electrons
  • number of electrons remains the same
  • transfer of electrons

  • 13. 
    Describes the number of atoms in a compound of each element.

  • coefficient
  • superscript
  • subscript
  • SI unit

  • 14. 
    Potassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction?

  • product side
  • reactant side
  • above the arrow
  • left out

  • 15. 
    A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred?

  • neutralization
  • double replacement
  • single replacement
  • synthesis

  • 16. 
    What are the correct coefficients when this equation is balanced?KClO3 --> KCl + O2

  • 2,2,2
  • 2,2,3
  • 1,2,3
  • 3,3,3

  • 17. 
    Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because?

  • Magnesium is higher on the reactivity series then hydrogen
  • magnesium is more reactive than hydrogen
  • magnesium is able to break the bond between HCl and form MgCl2
  • both b and c are correct

  • 18. 
    An element plus additional element reacts to form one product is an example of which type of chemical reaction?

  • combustion
  • decomposition
  • synthesis
  • single replacement

  • 19. 
    Which of the following compounds will not disassociate in water?

  • NaCl
  • PbCl2
  • MgNO3
  • Na2SO4

  • 20. 
    What type of chemical reaction takes place when fluorine reacts with sodium bromide?

  • single replacement
  • double replacement
  • combustion
  • synthesis
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