561.Why do noble gases have comparatively large atomic sizes?
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562.List the uses of neon and argon gases.
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563.State reasons for each of the following happenings: (i) Sulphur vapour exhibits some paramagnetism. (ii) Unlike phosphorus nitrogen shows little tendency for catenation.
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564.Give reasons for the following: CN– ion is known but CP– is not known.
565.Give reasons for the following: NO2 demerises to form N2O4
NO2 is an odd electron molecule i.e., it has one unpaired electron. Such molecules are highly reactive and tend to form a dimer by pairing of the unpaired electrons. Thus get stablity, Therefore NO2, dimerises to form N2O4 which contains a N-N single bond.
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566.Give reasons for the following: ICl is more reactive than I-I
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567.SF6 is a well known compond but SCl6 is not known. Explain?
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568.Assign an appropriate reason for each of the following statements: SiF62– is known but SiCl62– is not known.
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569.Assign an appropriate reason for each of the following statements: More metal fluorides are ionic in nature than metal chlorides.
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570.Assign an appropriate reason for each of the following statements: Solid phosphorus pentachloride exhibits some ionic character.
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