NTPC CBT-2 Chemistry Quiz - 23

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Question 1:

Which one of the following metals does not react with oxygen, water or acids?

Question 2:

Successive ionization enthalpy always 

Question 3:

Which of the following is the example of a lyophobic solution?

Question 4:

 Which one of the following is the chemical formula of Limestone  ?

Question 5:

What is the color of the precipitate obtained by passing CO2 gas through lime water ?