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Q33) Which of the following noble gas is not present in atmosphere [ JIPMER 2000]




SOLUTION

Radon is radio active and is prepared by disintegration of Radium. It does not occur in air
Answer: (d)


Q34) Which element out of He, Ar, Kr and Xe forms least number of compounds [ MP PMT 1995]




SOLUTION

He due to its very high ionization energy, form least number of compounds
Answer: (a)


Q35) Molecular shape of SF4, CF4 and XeF4 are [ IIT screening test 2000]



SOLUTION

Molecular shape of SF4 is see-saw, CF4 is tetrahedral and XeF4 is square planer and have 1, 0 and 2 lone pairs
Answer:(d)



Q36) What is the atomic number (Z) of the noble gas that reacts with fluorine? [ EAMCET 2001]



SOLUTION

Xe atomic number 54 reacts with fluorine
Answer: (a)


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