NTPC CBT-2 Chemistry Quiz - 43

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Question 1:

Which of the following elements behave chemically both as metal and nonmetal?

Question 2:

Which of the following particulate which cause bronchitis?

Question 3:

Blue vitrol or commonly known as Neela thotha is –

Question 4:

The value of Avogadro’s constant is:

Question 5:

The electronic configuration of chloride ion is ?