CBSE Class 10 Science 2021 Term 1 Solved Paper

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Question : 1
Total: 60
A student took Sodium Sulphate solution in a test tube and added Barium Chloride solution to it. He observed that an insoluble substance has formed. The colour and molecular formula of the insoluble substance is:
Solution:  
Explanation: When a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube, double displacement reaction takes place as the two compounds exchange their ions to form two different compounds, one of which is insoluble. The colour and molecular formula of that insoluble substance is white and it is BaSO4.
The reaction can be represented as follows:
BaCl2(aq)
Barium chloride
+
Na2SO4
Sodium sulphate
BaSO4( s)
Barium sulphate (White ppt.)
+2NaCl
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