INSECTICIDES, Chemistry

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what are the different types of method for the preparation of DDT?

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Number of unpaired electrons in  Mn 4+ is: (1) 3        (2) 5         (3) 6       (4) 4 Ans: 3

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The spectrum of  He is expected to be similar to: (1) H                      (2) Li +        (3) Na                 (4) He + Ans:  Li +

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Compounds with similar molecular formula but different properties are known as Isomers and the phenomenon is known as Isomerism.

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