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A student adds lead to a test tube containing copper chloride solution. The student observes that the colour of the solution in the test tube changes. What explains the change in the colour of the solution? 1-A double displacement reaction takes place as copper dissociates from sulphate and lead combines with sulphate in the solution. 2-A displacement reaction takes place as copper displaces lead from the solution. 3-A displacement reaction takes place as lead displaces copper from the solution. 4-A displacement reaction takes place as sulphate replaces copper from the solution.

Answer»

tion:The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to FORM cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori REARED in captivity (SERICULTURE).



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