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Worksheetsredox reaction
Total questions: 30
Worksheet time: 27mins
Oxidation involves
Loss of electrons
Gain of electrons
Increase in the valency of negative part
Decrease in the valency of positive part
Which halide is not oxidised by MnO2
F
Cl
Br
I
Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is
HClO4
HClO
HClO3
HClO2
Strongest reducing agent is
F-
Cl-
Br-
I-
The valency of Cr in the complex [Cr(H2O)4Cl2]+
1
3
4
6
In which of the following compound transition metal has zero oxidation state
CrO5
NH2NH2
[Fe(CO)5]
NOClO4
Phosphorus has the oxidation state of +3 in
Orthophosphoric acid
Phosphorus acid
Metaphosphoric acid
Pyrophosphoric acid
Oxidation numbers of two Cl atoms in bleaching powder, CaOCl2 are
– 1, – 1
+ 1, – 1
+ 1, + 1
0, – 1
A compound is in its low oxidation state. Then its will be
Highly acidic
Highly basic
Highest oxidising property
Half acidic, half basic
Nitrogen show different oxidation states in the range
0 to +5
– 3 to + 5
– 5 to + 3
– 3 to + 3
For H3PO3 and H3PO4 the correct choice is
H3PO3 is dibasic and reducing
H3PO3 is dibasic and non-reducing
H3PO4 is tribasic and reducing
H3PO3 is tribasic and non-reducing
The compound which could not act both as oxidising as well as reducing agent is
SO2
MnO2
Al2O3
CrO
Find out the oxidation state of Cr in CrO5
+5
+10
+6
+8
Arrange increasing order of their acidic strength of following
(i) HClO3 (ii) HBrO3 (iii) HIO3
i>ii>iii
i<ii<iii
i<iii<ii
iii<ii<i
Which one is not a ortho oxy acid?
Boric acid
phosphouric acid
phosphorous acid
Sulphuric acid
Which of the following species, do not
show disproportionation reaction
ClO–
ClO2–
ClO3–
ClO4–
Several blocks of magnesium are fixed to the bottom of a ship to
Keep away the sharks
Make the ship lighter
Prevent action of water and salt
Prevent puncturing by under-sea rocks
Solution of sodium metal in liquid ammonia is strongly reducing due to the presence of the following in the solution
Sodium atoms
Solvated electrons
Sodium hydride
Sodium amide
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. It is due to their
Solubility ability
Maximum oxidation number
Minimum oxidation number
Minimum number of valence electrons
The brown ring complex compound is formulated as [Fe(H2O)5NO]SO4 The oxidation state of iron is
1
2
3
0
In which of the following compounds the oxidation number of carbon is maximum
HCHO
CHCl3
CH3OH
C12H22O11
The process in which oxidation number increases is known as
Oxidation
Reduction
Auto-oxidation
None of the above
Assertion : SO2 and Cl2 both are bleaching agents
Reason : Both are reducing agents
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true.
1. Fluorine exists only in –1 oxidation state.
Reason : Fluorine has 2S22P5configuration.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true.
Assertion : HClO4is a stronger acid than HClO3 .
Reason : Oxidation state of in is HClO4 +VII and in HClO3 +V
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true.
1. Assertion : Oxidation number of carbon in CH2O is zero.
Reason : CH2O formaldehyde, is a covalent compound.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true.
1. Assertion : The oxidation numbers are artificial, they are useful as a ‘book-keeping’ device of electrons in reactions.
Reason : The oxidation numbers do not usually represent real charges on atoms, they are simply conventions that indicate what the maximum charge could possibly be on an atom in a molecule
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true.
1. Assertion : H 2SO4cannot act as reducing agent.
Reason : Sulphur cannot increase its oxidation number beyond + 6.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.
If assertion is false but reason is true
Oxidation number of nitrogen in NaNO2 is
+2
+3
+4
+5
Oxidation number of S in H2SO5 is
+4
+5
+6
+8
