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Q137) The boiling points of the following hydrides follow the order. [EAMCET 1999]




SOLUTION


Answer: (a)


Q138) Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to ... [ Tamilnadu CET 2001]




SOLUTION

Due to inert pair effect +5 oxidation state becomes less stable and +3 oxidation state becomes more stable down the group
Answer: (b)


Q139) What may be expected to happen when phosphine gas is mixed with chlorine gas [ AIEEE 2003]



SOLUTION

PH3 + 3Cl2 → PCl3 + 3HCl ( exothermic reaction)
Answer:(a)



Q140) Nitrogen shows different oxidation states in the range [ Kerala MEE 2003]



SOLUTION


Answer: (b)


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