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7th Class Science Sample Paper Science Sample Paper - 8

  • question_answer
               
    Write products of the following reactions :
    (i) Sulphuric acid reacts with sodium hydroxide.
    (ii) Copper oxide reacts with hydrochloric acid.
    (iii) Sulphur dioxide reacts with sodium hydroxide.

    Answer:

    (i) Sodium sulphate and water
    \[\left( 2NaOH+{{H}_{2}}S{{O}_{4}}=N{{a}_{2}}S{{O}_{4}}+2{{H}_{2}}O \right)\]                                                    
    (ii) Copper chloride and water
    \[\left( CuO+2HCl=CuC{{l}_{2}}+{{H}_{2}}O \right)\]                                                                                                      
    (iii) Sodium sulphite and water
    \[\left( S{{O}_{2}}+2NaOH=N{{a}_{2}}S{{O}_{3}}+{{H}_{2}}O \right)\]


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