3: Find the odd one out and give reasons:
a. Mg , P , S, Au
b. Krypton, Xenon , Oxygen , Radon
c. Mercury, Aluminum, Sodium, Calcium.
d. Conical flask, Round bottom flask, Flat bottom flask, Beaker
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Answer:
a. Au ... all the element are in 3rd period other than Au
b. oxygen ... others are inert gases
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