Question

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 1

Explanation:

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).