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An element A occupies group number 15 an...

An element A occupies group number 15 and period number 3, exhibits allotropy and it is tetra atomic. A reacts with caustic soda to give B which is having rotten fish odour. A reacts with chlorine to give C which has a pungent odour. Identify A, B and C. Write the reactions.

Text Solution

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(i) The element which occupies group number 15 and period number 3 is phosphorus. Hence , A is phosphorus. This is further supported by the fact the A exhibits allotropy and A is tetra atomic.
(ii) Phosphorus reacts with caustic soda to form phosphine as below :
`4P+3NaOH+3H_(2)O rarr PH_(3)+3NaH_(2)PO_(2)`
Hence, B is phosphine, `PH_(3)` which has rotten fish odour.
(iii) Phosphorus reacts with dry chlorine to form phosphorus trichloride which has a pungent odour.
`P_(4)+6Cl_(2) rarr 4PCl_(3)`
Thus, A = Phosphorus
`" "`B = Phosphine
`" "` C = Phosphorus trichloride
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