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Published on: 29/08/2019
Redox Reactions
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Questions + Answers key
Take MCQ Chemistry Test
1.
Represent a galvanic cell in electrode and ions containing Cu electrode dipped in molar solution of copper sulphate and silver electrode dipped in molar solution of silver nitrate.
2.
What are spectator ions? Give one example
3.
Find the value of n in 4MnO4-+8H+ +ne- \(\rightarrow\) Mn2+ +4H2O
4.
What is the most essential conditions that must be satisfied in a redox reaction?
5.
In the ethylene molecule the two carbon atoms have the oxidation numbers.
-1, -1
-2, -2
-1, -2
+2,-2
6.
Which one among the following is not example of autoredox reaction?
\({ P }_{ 4 }+{ OH }^{ - }\longrightarrow { H }_{ 2 }{ PO }_{ 4 }^{ - }+{ PH }_{ 3 }\)
\({ H }_{ 2 }{ O }_{ 2 }\longrightarrow { H }_{ 2 }{ O+O }_{ 2 }\)
\({ S }_{ 2 }{ O }_{ 3 }^{ 2- }\longrightarrow S{ O }_{ 4 }^{ 2- }+S\)
\(AgCl+{ NH }_{ 3 }\longrightarrow [Ag({ NH }_{ 3 })_{ 2 }]Cl\)
7.
Which of the following are not redox reactions?
Mg + N2 \(\rightarrow\) Mg3N2
K4[Fe (CN)6] + H2S04 + H20 \(\rightarrow\) K2S04 + CO + FeS04 + (NH4)2S04
\({ S }_{ 2 }{ O }_{ 3 }^{ 2- }\longrightarrow S{ O }_{ 4 }^{ 2- }+S\)
\(AgCl+{ NH }_{ 3 }\longrightarrow [Ag\left( { NH }_{ 3 } \right) 2]Cl\)
8.
The oxidation number of carbon 'is zero in ______.
HCHO
CH2Cl2
C12H22O11
All the above
9.
When methane is burnt in oxygen to produce CO2 and H20 the oxidation number of carbon changes by ______.
-8
Zero
+8
+4
10.
The oxidation number of the carboxylic carbon atom in CH3 COOH is ______.
+2
+4
+1
+3
11.
On the reaction 2Ag + 2H2SO4 \(\rightarrow\) Ag2So4 + 2H2O+SO2 sulphuric acid acts as ______.
an oxidizing agent
a reducing agent
a catalyst
an acid as well as an oxidant
12.
Which of the following is most powerful oxidizing agent in the following
O3
KMnO4
H2O2
K2Cr2O7
13.
Which of the following halogens do not exhibit a positive oxidation number in their compounds?
F
Br
I
Cl
14.
Among the following molecules, in which does bromine show the maximum oxidation number?
Hg2 (Br03)2
Br - Cl
KBrO4
Br2
1.
Since, the reduction potential of copper is less than that of Ag, so Cu electrode behave as anode and Ag electrode as cathode Cu ICu2+ (aq) II Ag+ (aq) I Ag
2.
Spectator ions are ions that stay unaffected during a chemical reaction. They appear both as reactant and as product in an ionic equation, eg. in the following ionic equation, the sodium and nitrate ions are spectator ions
Ag+ (aq) +NO-3 (aq) +Na+ (aq) +CI- (aq) → AgCI(s) +Na+ (aq) + NO-3 (aq)
3.
4MnO4-+8H+ +ne- → Mn2+ +4H2O
-1 + 8 + n = +2
-1 - 2+ 8 + n = 0
n = - 5 or 5e-
4.
In a redox reaction, the total number of electrons lost by reducing agent must be equal to the number of electrons gained by the oxidising agent.
5.
(b)
-2, -2
6.
(d)
\(AgCl+{ NH }_{ 3 }\longrightarrow [Ag({ NH }_{ 3 })_{ 2 }]Cl\)
7.
(d)
\(AgCl+{ NH }_{ 3 }\longrightarrow [Ag\left( { NH }_{ 3 } \right) 2]Cl\)
8.
(d)
All the above
9.
(d)
+4
10.
(d)
+3
11.
(d)
an acid as well as an oxidant
12.
(a)
O3
13.
(a)
F
14.
(c)
KBrO4
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