Unit20 Group18 - Noble gases qns

Unit20 Group18 - Noble gases qns - 1 UNIT 20 Noble gases...

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1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 20 Noble gases (Zero group) group 18 1. The most plentiful (0.9%) of air in the atmosphere is (a) Helium (b) Neon (c) Argon (d) Krypton 2. The noble gas found in a mineral clevite and in some wells of Kansas City (U.S.A) (a) He (b) Ne (c) Ar (d) Kr 3. Radon is a radioactive gas which decays into polonium wit t1/2 of nearly (a) 4 days (b) 8 days (c) 16 days (d) 1622 days 4. The noble gases were discovered by the combined efforts of (a) Rayleigh and Ramsay (b) Doron (c) Rayeigh, Ramsay, Traver and Doron (d) Lockyers and Ruther ford 5. The separation of noble gases by Fractional distillation of liquid air is based upon (a) the difference in their B.P (b) the difference in their spectra (c) the difference in their densities (d) none of these 6. The noble gas atoms in the liquid or solid state are held by (a) H-bonds (b) covalent bonds (c) Vander waal’s fores (d) all of these 7. Noble gases are mono-atomic because (a) Their densities are lass than one (b) The C p /C r ratio ius 1.67 (c) The C p /C r ratio ius 1.41 (d) They are unreactive 8. In which noble gas are the vander waal’s forces strongest? (a) Ne
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This note was uploaded on 10/05/2011 for the course CHEM 1201 taught by Professor Darcy during the Spring '11 term at St. Mary NE.

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Unit20 Group18 - Noble gases qns - 1 UNIT 20 Noble gases...

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