A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the
reaction which element undergoes a maximum change in the oxidation number?
1. S
2. H
3. Cl
4. C
The oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively -
1. | +3, +5, +4 | 2. | +5, +3, +4 |
3. | +5, +4, +3 | 4. | +3, +4, +5 |
Oxidation numbers of P in , of S in and that of Cr in are respectively,
1. +5, +6 and +6
2. +3, +6 and +5
3. +5, +3 and +6
4. -3, +6 and +6
The number of moles of MnO-4 required to oxidise one mole of ferrous oxalate completely in an acidic medium is-
1. 0.6 mole
2. 0.4 mole
3. 7.5 moles
4. 0.2 mole
Which of the following oxidation states are the most characteristics for lead and tin respectively?
1. +4, +2
2. +2, +4
3. +4, +4
4. +2, +2
Which one of the following orders correctly represents the increasing acid strengths of the given acids?
(1) HOCl <HOClO <HOClO2 < HOClO3
(2) HOClO <HOCl <HOClO3 <HOClO2
(3) HOClO2 <HOClO3 <HOClO <HOCl
(4) HOClO3> HOClO2 <HOClO <HOCl
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. It is due to their .
(1) Solubility ability
(2) Maximum oxidation number
(3) Minimum oxidation number
(4) Minimum number of valence electrons
The valency of Cr in the complex [Cr(H2O)4Cl2]+ [MP PMT 2000]
(1) 1
(2) 3
(3) 5
(4) 6
In the conversion the oxidation state of bromine changes from -
(1) – 1 to – 1
(2) 0 to – 1
(3) 0 to + 5
(4) 0 to – 5
Oxidation number of cobalt in K[Co(CO)4] is
(1) + 1
(2) + 3
(3) – 1
(4) – 3