Redox Reaction Test

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Redox Reaction Test - 6

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Question 1
1 / -0

The electron releasing tendency of the metals, zinc, copper and silver is in the order:

A
Cu>Ag>Zn

B
Zn>Ag>Cu

C
Zn>Cu>Ag

D
Ag>Cu>Zn

Solution

The electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag
Question 2
1 / -0

In Daniell cell, direction of current is

A
towards centre

B
towards anode

C
in the same direction of electron flow

D
opposite to the direction of electron flow

Solution

In Daniel cell direction of current is opposite to the direction of electron flow.
Question 3
1 / -0

The oxidation number of hydrogen in LiH, NaH and CaH₂ is

A
1and 2

B
-2

C
-1 and -2

D
-1.0

Solution

alkaline earth metal have +2 oxidation state.
Question 4
1 / -0

A metal in a compound can be displaced by another metal in the uncombined state. Which metal is a better reducing agent in such a case?

A
better reducing agent is the one that loses more electrons

B
better reducing agent is the one that loses less electrons

C
Both are same in reducing capacity

D
the reduced metal is a better reducing agent than the reducing metal

Solution

Reducing agent is one in which element undergo oxidation itself and make the other substance reduce.
Question 5
1 / -0

In the reaction of metallic cobalt placed in nickel sulphate solution, therein is a competition for release of electrons At equilibrium, chemical tests reveal that both Ni⁺₂ (aq) and Co⁺₂ (aq) are present at moderate concentrations. The result is that:

A
Only one reactant and one product is greatly favoured.

B
Only [Co(s) and Ni⁺₂ (aq)] are favoured

C
Only Co⁺₂ (aq) and Ni (s)] are favoured

D
neither the reactants nor the products [are greatly favoured.

Solution

Reaction will not go to completion. It will remain at equilibrium.
Question 6
1 / -0

The flow of current is possible in Daniel cell only

A
if the transfer of electrons does take place directly from Zn to Cu2+

B
if there is a potential difference between the copper and zinc electrodes

C
if the zinc and copper rods are connected by a salt bridge only

D
if the zinc and copper rods are connected by the platinum wire only

Solution

The flow of current is possible only due to potential difference.
Question 7
1 / -0

Chlorine, bromine and iodine when combined with oxygen, have oxidation numbers

A
-1

B
-1 or any negative number

C
+1 or any positive number

D
-2

Solution

If H is attached to metal then its oxidation state of H is -1.
Question 8
1 / -0

The decomposition of hydrogen peroxide to form water and oxygen is an example of

A
displacement reactions

B
decomposition reactions

C
disproportionation reaction

D
combination reactions

Solution
Question 9
1 / -0

Hydrogen is prepared from H₂O by adding

A
Ag, which acts as reducing agent

B
Ca, which acts as reducing agent

C
Au, which acts as oxidising agent

D
AI, which acts as oxidising agent

Solution

Ag and Au are less reactive than H( from reactivity series. So they can’t be considered). To form H₂ from H₂O, we need a reducing agent.
Question 10
1 / -0

Oxidation number denotes the oxidation state of an element in a compound ascertained on the basis that electron in a covalent bond belongs

A
entirely to more electronegative element

B
entirely to transition elements if present

C
entirely to halogens in a compound

D
None of the above

Solution

Oxidation number basically defines the charge present on element in combined form.
Question 11
1 / -0

In oxygen difluoride (OF₂) and dioxygen difluoride(O₂F₂), the oxygen is assigned an oxidation number of

A
+2

B
+2 and +1

C
+2 and +4

D
+4 and +3

Solution

Oxidation state of O in OF₂ is +2 and O₂F₂ is +1.
Question 12
1 / -0

The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?

A
The algebraic sum of all the oxidation numbers in a compound is zero.

B
In all its compounds, the oxidation number of fluorine is – 1.

C
An element in the free or the uncombined state bears oxidation number zero.

D
The oxidation number of hydrogen is always +1.

Solution

as oxygen is more electronegative than Cl,Br and I. So they have positive oxidation state.
Question 13
1 / -0

Identify the correct statements with reference to the given reaction

A
Phosphorus is undergoing oxidation as well as reduction.

B
Phosphorus is undergoing oxidation only.

C
Phosphorus is undergoing reduction only.

D
Hydrogen is undergoing oxidation as well as reduction

Solution

P4 is undergoing oxidation as well as reduction. As oxidation number of P₄ is 0 in reactant and it increases to +3 in H₂PO₂₋ and decreases to -3 in PH₃
Question 14
1 / -0

In the conversion of Br₂ to Bro_3- , the oxidation number of Br changes from

A
zero to +5

B
+1 to +5

C
zero to -3

D
+2 to +5

Solution

In Br₂ oxidation number of Br is 0 while in BrO₃₋ Br has oxidation number of +5 as each O carries -2 charge and net charge is -1.
Question 15
1 / -0

The highest value of oxidation number changes from 1 to 7

A
in the atoms of transition elements

B
the first three groups

C
In alkaline earth metals

D
across the third period in the periodic table

Solution

Across the 3^rd period in the periodic table, oxidation n changes from K(19, +1) to Mn(25, +7).
Question 16
1 / -0

Oxidation number of 1/2 is assigned to oxygen atom in

A
superoxides

B
when oxygen is bonded to fluorine

C
when oxygen is bonded to metals

D
peroxidesperoxides

Solution

Superoxides have O₂₋
Question 17
1 / -0

The more positive the value of E0, the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.
E0values : Fe3 + / Fe2+ = +0.77; I2(s)/l^- = +0.54; cu²⁺/ Cu = +0.34; Ag⁺ / Ag = +0.80V

A
Ag⁺

B
Fe³⁺

C
I2 (s)

D
Cu²⁺

Solution

Oxidation number of H is not always +1 . It can be -1 , 0.
Question 18
1 / -0

The electron releasing tendency of the metals, zinc, copper and silver is in the order:

A
Zn>Cu>Ag

B
Zn>Ag>Cu

C
Cu>Ag>Zn

D
Ag>Cu>Zn

Solution

The electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag
Question 19
1 / -0

In the reaction
2H₂O₂ → 2H₂O +O₂

A
Oxygen is oxidised only

B
Oxygen is neither oxidised nor reduced

C
Oxygen is both oxidised and reduced

D
Oxygen is reduced only

Solution

This is a dispropotionation reaction.
Question 20
1 / -0

The oxidation number of oxygen in most compounds is

A
-3

B
1

C
4

D
-2.0

Solution

Common oxidation state of oxygen is -2
Question 21
1 / -0

Assign oxidation number to P in NaH₂PO₄

A
+6

B
+1

C
+4

D
5.0

Solution

Oxidation state of P in NaH₂PO₄
Question 22
1 / -0

The oxidizing power of halogens increase in the order of

A
I₂< Br₂< Cl₂< F₂

B
F₂< I₂< Br₂< Cl₂

C
Cl₂< F₂< I₂< Br₂

D
Br₂< Cl₂< F₂< I₂

Solution

I₂< Br₂< Cl₂< F₂
is the order of oxidising power.
Question 23
1 / -0

Identify the correct statement (s) in relation to the following reaction: Zn+ 2HCl → ZnCl₂ +H₂

A
Hydrogen ion is acting as an oxidant

B
Zinc is acting as an oxidant

C
Chlorine is acting as a reductant

D
Hydrogen ion is acting as a reductant

Solution

Zn is oxidized to Zn⁺² while H+ is reduced to H₂. So H⁺ is acting as oxidant and Zn is acting as reductant.
Question 24
1 / -0

Consider the elements: Cs, Ne, I and F. Identify the element(s) that exhibits only negative oxidation state

A
F

B
I

C
s

D
Cs and F

Solution

F has negative oxidation state as it is very electro negative.

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Redox Reaction Test - 6

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Redox Reaction Test - 6

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Question 1

Cu>Ag>Zn

Zn>Ag>Cu

Zn>Cu>Ag

Ag>Cu>Zn

Solution

Question 2

towards centre

towards anode

in the same direction of electron flow

opposite to the direction of electron flow

Solution

Question 3

1and 2

-2

-1 and -2

-1.0

Solution

Question 4

better reducing agent is the one that loses more electrons

better reducing agent is the one that loses less electrons

Both are same in reducing capacity

the reduced metal is a better reducing agent than the reducing metal

Solution

Question 5

Only one reactant and one product is greatly favoured.

Only [Co(s) and Ni+2 (aq)] are favoured

Only Co+2 (aq) and Ni (s)] are favoured

neither the reactants nor the products [are greatly favoured.

Solution

Question 6

if the transfer of electrons does take place directly from Zn to Cu2+

if there is a potential difference between the copper and zinc electrodes

if the zinc and copper rods are connected by a salt bridge only

if the zinc and copper rods are connected by the platinum wire only

Solution

Question 7

-1

-1 or any negative number

+1 or any positive number

-2

Solution

Question 8

displacement reactions

decomposition reactions

disproportionation reaction

combination reactions

Solution

Question 9

Ag, which acts as reducing agent

Ca, which acts as reducing agent

Au, which acts as oxidising agent

AI, which acts as oxidising agent

Solution

Question 10

entirely to more electronegative element

entirely to transition elements if present

entirely to halogens in a compound

None of the above

Solution

Question 11

+2

+2 and +1

+2 and +4

+4 and +3

Solution

Question 12

The algebraic sum of all the oxidation numbers in a compound is zero.

In all its compounds, the oxidation number of fluorine is – 1.

An element in the free or the uncombined state bears oxidation number zero.

The oxidation number of hydrogen is always +1.

Solution

Only [Co(s) and Ni⁺₂ (aq)] are favoured

Only Co⁺₂ (aq) and Ni (s)] are favoured

Ag⁺

Fe³⁺

Cu²⁺

I₂< Br₂< Cl₂< F₂

F₂< I₂< Br₂< Cl₂

Cl₂< F₂< I₂< Br₂

Br₂< Cl₂< F₂< I₂