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CBSE Class 12-science Answered

Two gases A and B are allotropes. A is paramagnetic and B is diamagnetic. B is a powerful oxidizing agent than A. A is converted to B by silent electrical discharge. A is colorless while B is a pale blue gas. B reacts with blackened lead paintings to make them white. B converts colorless NO gas to brown gas C and A is also formed.  Identify A,B and C and write the reactions involved.
Asked by lekhakarthikeyan | 28 Aug, 2018, 03:43: AM
answered-by-expert Expert Answer

1) A is an oxygen gas which is paramagnetic and B is an ozone gas which is the powerful oxidizing agent than A oxygen.

2) oxygen is converted to ozone by silent electrical discharge to avoid its decomposition.
 
3 straight O subscript 2 space rightwards arrow with sunlight on top space 2 straight O subscript 3
 
3) ozone reacts with blackened lead paintings to make them white.
 
4 straight O subscript 3 space plus space PbS space rightwards arrow 4 straight O subscript 2 space plus space PbSO subscript 4
4) Ozone (B) converts colorless NO gas to brown gas C and A is also formed. 
 
straight O subscript 3 space plus space NO space rightwards arrow space NO subscript 2 space plus space straight O subscript 2 straight B space space space space space space space space space space space space space space space space space space space straight C space space space space space space space space space space straight A
 
 
Therefore,
A = Oxygen O2
B= Ozone O3
C= Nitrogen dioxide NO2
Answered by Ramandeep | 29 Aug, 2018, 11:12: AM

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