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Q17)Which of the following statements about noble gases is false? [ Pb CET sample papers 1990]




SOLUTION

Since no unpaired electrons are available noble gas do not form diatomic molecule
Answer: (c)


Q18) The noble gas was first time discovered by [ MP CET 1993]




SOLUTION


Answer: (b)


Q19) Which of the following is the correct sequence of the noble gases in their group in the periodic table? [ Manipal PMT 1995]



SOLUTION


Answer:(d)



Q20) Hybridization and structure of XeF4 is [ PCPMT 2001]



SOLUTION

Total valence electrons = (28+8) ÷ 8 = 4( Q1 + 4(R1
R ÷ 2 = 4 ÷ 2 = 2
Total Of Q1 + Q2 = 4 + 2 = 6 ∴ Hybridization is sp3d2, square planar
Answer: (c)


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