Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively
+3, +5, +4
+5, +3, +4
+5, +4,+3
+5, +4,+3
D.
+5, +4,+3
Oxidation state of H is +1 and that of O is -2
Let the oxidation state of P in the given compound x.
In H4P2O5,
(+1) x 4 +2 X x + (-2) x 5 = 0
4 + 2x -10 = 0
2x = 6
x = 3
In H4P2O6,
(+1) X 4 + 2 X x + (-2) x6 = 0
4 x + 2x-12 = 0
2x = 8
x =4
In H4P2O7,
(+1) x 4 x 2 X x + (-2) x 7 = 0
4 + 2x -14 = 0
2x = 10
x = +5
Thus oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are +3, +4 and +5.
which of the following oxides is not expected to react with sodium hydroxide?
B2O3
CaO
SiO2
SiO2
The correct order of increasing bond angles in
Cl2O < ClO2 < ClO2-
ClO2 <Cl2O< ClO2-
Cl2O < ClO2- < ClO2
Cl2O < ClO2- < ClO2
The stability of +1 oxidation state increases in the sequence
Al < Ga <In < Tl
Tl < In <Ga< Al
In < Tl < Ga < Al
In < Tl < Ga < Al
The variation of the boiling point of the hydrogen halides in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?
The electronegativity of fluorine is much higher than for other elements in the group
There is strong hydrogen bonding between HF molecules
The bond energy of HF molecules is greater than in other hydrogens halides
The bond energy of HF molecules is greater than in other hydrogens halides
Match (I) substances with List (II) processes employed in the manufacture of the substances and select the correct option.
|
List I |
List II |
||
|
A |
Sulphuric acid |
1 |
Haber’s process |
|
B |
Steel |
2 |
Bessemer’s process |
|
C |
Sodium |
3 |
Lablanc process |
|
D |
Ammonia |
4 |
Contact process |
|
A |
B |
C |
D |
|
1 |
4 | 2 |
3 |
|
A |
B |
C |
D |
|
1 |
2 |
3 |
4 |
|
A |
B |
C |
D |
|
4 |
3 | 2 | 1 |
|
A |
B |
C |
D |
|
4 |
3 | 2 | 1 |
The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence
Ga<In< Al<Tl
Al<Ga<In<Tl
Tl<In<Ga<Al
Tl<In<Ga<Al
Strong reducing behaviour of H3PO4 is due to
the presence of one -OH group and two P-H bonds
high electron gain enthalpy of phosphorous
the high oxidation state of phosphorus
the high oxidation state of phosphorus
