The pair of compounds that can exist together is
1. FeCl3, SnCl2
2. HgCl2, SnCl2
3. FeCl2, SnCl2
4. FeCl3, KI
In which of the following compounds, nitrogen exhibits highest oxidation state?
1. N2H4
2. NH3
3. N3H
4. NH2OH
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