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Topic Question Set

Q 1 :    

Which of the following is NOT a type of chemical reaction?

  • Combination reaction

     

  • Decomposition reaction

     

  • Condensation reaction

     

  • Displacement reaction

     

(3)     Condensation reaction

 

Q 2 :    

What is observed when quicklime (CaO) is added to water?

  • No reaction occurs

     

  • Bubbles are formed

     

  • A highly exothermic reaction takes place

     

  • A gas is evolved

     

(3)         A highly exothermic reaction takes place

 

Q 3 :    

Which gas is released when hydrochloric acid reacts with zinc?

  • Oxygen

     

  • Hydrogen

     

  • Carbon dioxide

     

  • Nitrogen

     

(2)      Hydrogen

 

Q 4 :    

What is the color change observed when iron nails are placed in copper sulfate solution?

  • No color change

     

  • The solution turns blue

     

  • The solution turns green

     

  • The solution turns colorless

     

(3)     The solution turns green

 

Q 5 :    

Which of the following statements is true about a redox reaction?

  • Both oxidation and reduction occur simultaneously

     

  • Only oxidation occurs

     

  • Only reduction occurs

     

  • Neither oxidation nor reduction occurs

     

(1)      Both oxidation and reduction occur simultaneously