General Science Question and Answers - TNPSC

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GENERAL SCIENCE QUESTIONS AND ANSWERS 41 to 45

41.Permanent hardness of water can be removed by adding

washing soda

42.The major ingredient of leather is

Collagen

43. Which of following substances undergoes chemical change on heating ?

it can dissociate into equal number of hydrogen ions

44.Saponification involves the hydrolysis of fats and oils by

Caustic acid

45.------ is not an isotope of hydrogen?

Yttrium

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