RRB GROUP D Chemistry Quiz - 57

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Question 1:

Tooth enamel is made up of 

Question 2:

Which one of the following is the amphoteric oxide?

Question 3:

Which of the following ions are responsible for transmission of nerve signals ?

Question 4:

What happen when sewage is disposed in water bodies ?

Question 5:

Which of the following isotope is used in the treatment of goiter?