important question of redox reaction with answer for aieee 2010
umesh kumar singh , 15 Years ago
Grade 12
Physical Chemistry> redox reaction...
1 AnswersSuraj Prasad
Last Activity: 10 Years ago
Three reactions involvingH2PO-4 are given below :
(i) H3PO4
+ H2O ® H3O+ + H PO-
(ii) H PO-
+ H2O ® HPO2
- + H3O+
2
4
2
4
4
(iii) H2PO-4 + OH- ® H3PO4 + O2-
In which of the above does H2PO-4 act as an acid ?
(1) (ii) only
(2) (i) and (ii)
(3) (iii) only
(4) (i) only
(1)
Sol :
(i)
H PO
4
+ H ® H O+ + H PO-
3
2
3
2
4
acid
conjugate base
(ii)
H PO-
+ H2O ® HPO-2
+ H O+
2
4
4
3
acid
conjugate base
(iii) H PO-
+ OH-
® H PO
4
+ O–2
2
4
acid
3
acid
conjugate acid
Only in reaction (ii) H2PO-4 acids as ‘acid’.
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