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Thermochemistry & Electrochemistry

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Strong reducing agents have large negative value of

a)

Oxidation potential

b)

Redox potential

c)

Reduction potential

d)

Emf of cell

2.

Which of the following is true in the case of Zn-Cu cell?

a)

The flow of electrons takes place from copper to zinc

b)

E°red of copper electrode is less than that of zinc electrode

c)

Zinc acts as an anode and copper as cathode

d)

All are correct

3.

In a galvanic cell

a)

Chemical energy is converted into electrical energy

b)

Chemical energy is converted into heat

c)

Electrical energy is converted into chemical energy

d)

Electrical energy is converted into heat

4.

Salt bridge transfers

a)

Electrons

b)

Current

c)

Anion

d)

Ions

5.

Temperature for the measurement of standard electrode potential is

a)

298K

b)

273K

c)

25K

d)

310K

6.

The element that act as cathode always have ______ position in electrochemical

series

a)

Higher

b)

In middle

c)

Lower

d)

No effect of position

7.

Reference electrode of _______ is used in the determination of electrode potential of different elements

a)

Hydrogen

b)

Carbon

c)

Lead

d)

Copper

8.

Zn + FeSO4 → ZnSO4 + Fe , in the given reaction which of the following is reduced

a)

Zn

b)

Fe^+2

c)

Zn^+2

d)

Fe

9.

When fused PbBr2 is electrolysed

a)

Br2 is liberated at cathode

b)

Pb deposited at anode

c)

Pb deposited at cathode

d)

PbBr2 is not electrolyzed

10.

Electrolysis is the process in which a chemical reaction takes place at the expense of

a)

Chemical energy

b)

Electrical energy

c)

Heat energy

d)

Potential energy

11.

Which of the following will form the cathode with respect to iron anode in

an electrolyte?

a)

Mg

b)

Al

c)

Cu

d)

Zn

12.

Aqueous solution of caustic soda on electrolysis produce _____ and _____ at anode and cathode respectively

a)

H2 and O2

b)

O2 and H2

c)

Na and O2

d)

O2 and Na

13.

Smaller is the value of standard reduction potential of substance

a)

Greater is the oxidizing power of the substance

b)

Greater is the reducing power of the substance

c)

Lesser will be its tendency to combine with oxygen

d)

Lesser will be its tendency to displace hydrogen from acid

14.

Which one of the following elements occurs only in one oxidation state?

a)

Fluorine

b)

Chlorine

c)

Nitrogen

d)

Oxygen

15.

Which of the following is a redox reaction?

a)

KOH + HCl → KCl + H2O

b)

AgNO3 + NaCl → AgCl + NaNO3

c)

BaCl2 + H2SO4 → BaSO4 + 2HCl

d)

Zn + 2HCl → ZnCl2 + H2

16.

To balance oxygen in ion electron method in acidic medium, we add

a)

H+ion

b)

OH−ion

c)

H2O

d)

O2

17.

___________can displace Hydrogen from acid more easily

a)

Au

b)

Al

c)

Pb

d)

Ca

18.

Which value of heat of formation indicates that the product is the least stable?

a)

– 94 kCals

b)

– 231.6 kCals

c)

+ 21.4 kCals

d)

+ 64.8 kCals

19.

Absorption of heat occurs when

a)

Carbon burns in air

b)

NH4Cl dissolved in water

c)

SO2 is oxidized to SO3

d)

CH4 gas is burnt

20.

Identify the state function among the following

a)

q

b)

q / W

c)

q x W

d)

q + W

21.

For the neutralization of 1 mole of H2SO4 with 2 moles of NaOH in dilute solution, the heat liberated is

a)

=57 kJ

b)

< 57 kJ

c)

> 57kJ

d)

=28.5 kJ

22.

The enthalpy change of a reaction does not depend on

a)

Initial and final enthalpy change of reaction

b)

Different intermediate reactions

c)

State of reactants and products

d)

Nature of reactant and product

23.

Which enthalpy change (∆H) is relevant in the following equation. H2 → H + H ∆H = +436kJmol–1

a)

Enthalpy of formation

b)

Enthalpy of solution

c)

Bond dissociation energy

d)

Bond dissociation energy

24.

Heat of formation of MgO is given below:

Mg( s) + 1/2O2( g ) → MgO( s) ∆ H f = −692KJ / mol

This equation shows that

a)

The reaction is endothermic

b)

The product is very stable

c)

The product is highly unstable

d)

The reactants are very stable

25.

In exothermic reaction heat transfer from

a)

Surrounding to system

b)

System to surrounding

c)

System to system

d)

Surrounding to surrounding

26.

Enthalpy change during the formation of one mole of atoms from its elements is

called enthalpy of atomization. The element in this change is in

a)

Solid state

b)

Liquid state

c)

Gaseous state

d)

Any of the above state

27.

Which of the following formula cannot be used in Hess’s law?

a)

H = H1 + H2

b)

Hf° = Hl° + Hx

c)

H(cycle) = 0

d)

Hl° = Hf° + Hx

28.

Oxidation state of “P” in phosphonium ion (PH4+) is

a)

+3

b)

-3

c)

+5

d)

-4

29.

Arrange Mg, K and Na in the order of their decreasing reduction potentials

a)

K, Na, Mg

b)

Mg, K, Na

c)

Na, K, Mg

d)

Mg, Na, K

30.

Which of the following metal can liberate hydrogen from halogen acid?

a)

Ag

b)

Cu

c)

Zn

d)

Hg

31.

Which of the following element act as inert electrode?

a)

Cu

b)

Pt

c)

Ag

d)

Zn

32.

Which one of the following metals will make a layer on other three metals when

dipped in its aqueous solution?

a)

Cr

b)

Al

c)

Cu

d)

Zn

33.

The standard reduction potential of two electrodes are given as

A=+1.36V B = -0.44 V the emf of the cell is

a)

+1.36V

b)

+0.92V

c)

-1.36V

d)

+ 1.80V

34.

° Standard enthalpy of combustion of carbon (ΔHc ) is

a)

–393.7 kJ/mol

b)

+393.7 kJ/mol

c)

–57.4 kJ/mol

d)

+787 kJ/mol

35.

Correct decreasing order of energy is

a)

1 erg > 1 Joule > 1 Cal

b)

1 Cal > 1 Joule > 1 erg

c)

1 erg > 1 Cal > 1 Joule

d)

1 Joule > 1 Cal > 1 erg

36.

Lesser the energy of a system

a)

Greater is its stability

b)

Lesser is its stability

c)

Greater is its un-stability

d)

None of these

37.

For the melting of ice H is

a)

Negative

b)

Positive

c)

Zero

d)

Cannot be predicted

38.

When an exothermic reaction is reversed it

a)

Becomes another exothermic reaction

b)

Becomes an endothermic reaction

c)

Show no heat change at all

d)

Attains equilibrium

39.

For a given reaction

CH3COOH+NaOH → CH3COONa+H2O

The change in enthalpy under standard conditions is called?

a)

Standard enthalpy change of solution

b)

Standard enthalpy change of neutralization

c)

Standard enthalpy change of hydration

d)

Standard enthalpy change of formation

40.

All types of energies of particles forming a system is called

a)

Enthalpy

b)

Kinetic energy

c)

Potential energy

d)

Internal energy

41.

Smaller is the value of standard reduction potential of substance

a)

Greater is the oxidizing power of the substance

b)

Greater is the reducing power of the substance

c)

Lesser will be its tendency to combine with oxygen

d)

Lesser will be its tendency to displace hydrogen from acid

42.
a)

A

b)

B

c)

C

d)

D

43.
a)

A

b)

B

c)

C

d)

D

44.
a)

A

b)

B

c)

C

d)

D

45.
a)

A

b)

B

c)

C

d)

D

46.
a)

A

b)

B

c)

C

d)

D

47.
a)

A

b)

B

c)

C

d)

D

48.
a)

A

b)

B

c)

C

d)

D

49.
a)

A

b)

B

c)

C

d)

D

50.
a)

A

b)

B

c)

C

d)

D

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