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CBSE Class 12-science Answered

A hydride of gr 16 element is a gas and acts as a reducing agent when reacted with SO2. It has a smell of rotten eggs and is used in qualitative analysis. It forms a black ppt with Ni2+ in basic medium. It also forms a black ppt with lead acetate solution. Identify the gas and write the equations involved.

Asked by lekhakarthikeyan | 28 Aug, 2018, 04:01: AM
Expert Answer
1) A hydride of gr 16 elements is a gas and acts as a reducing agent when reacted with SO2. It has a smell of rotten eggs and is used in qualitative analysis.
 
 There is only one hydride which has rotten eggs smell and is used in the qualitative analysis is H2S.
 
2 straight H subscript 2 straight S subscript left parenthesis straight g right parenthesis end subscript space plus space SO subscript 2 left parenthesis straight g right parenthesis end subscript space rightwards arrow 2 straight H subscript 2 straight O subscript left parenthesis straight l right parenthesis end subscript space plus space 3 space straight S subscript left parenthesis straight s right parenthesis end subscript
 
2)  It forms a black ppt with Ni2+ in basic medium. It also forms a black ppt with lead acetate solution
 
 
Pb left parenthesis OAc right parenthesis subscript 2 left parenthesis aq right parenthesis space end subscript space plus space space straight H subscript 2 straight S subscript left parenthesis straight g right parenthesis end subscript space rightwards arrow space PbS subscript left parenthesis straight s right parenthesis end subscript downwards arrow space plus space space 2 space HOAc subscript left parenthesis aq right parenthesis end subscript
Answered by Ramandeep | 29 Aug, 2018, 11:46: AM
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