IIT-JEE Exam

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are
option
(A) O2 and CO respectively
(B) O2 and Zn dust respectively
(C) HNO3 and Zn dust respectively.
(D) HNO3 and COrespectively

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IIT-JEE Other Question
The reaction of white phosphorous with aqueous NaOH gives phosphine along with another phosphorus
containing compound. The reaction type; the oxidation states of phosphorous in phosphine and the other
product are respectively
(A) redox reaction; – 3 and –5
(B) redox reaction ; 3 and + 5
(C) disproportionation reaction ; – 3 and + 5
(D) disproportionation reaction; – 3 and + 3 The shape of XeO2F2molecule is
option
(A) trigonal bipyramidal
(B) square plannar
(C) tetrahedral
(D) see-saw