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11th Chemistry Weekly Test - 3 ( Thermodynamics )

MABS Institution

11th Chemistry Weekly Test - 3 ( Thermodynamics )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

For an exothermic reaction, ΔH_r value will be------

+Ve
-Ve
Zero
infinity

Hess's law can be applied to calculate -------- of reactions.

enthalpy
entropy
free energy
internal energy

All naturally occurring processes are ----- process

reversible
irreversible
cyclic process
isochoric process

For a cyclic process involving isothermal expansion of an ideal gas.

∆U=qV
∆U=w
∆U= q + w
∆U=0

Which among the following is a path function?

Enthalpy
Free energy
Internal energy
Work

-----is an intensive property

internal energy
volume
temperature
mass

The branch of science associated with determining the changes in energy of a system by measuring the heat exchanges with the surrounding is called-----

Mechanics
aerodynamics
Kinetics
Thermodynamics

Which is true about cyclic process?

ΔU=0; ΔH=0
ΔU>0; ΔH<0
ΔH=0; ΔU<0
ΔU=0; ΔH<0

Heat of combustion of methane is ------- KJ/mol.

-87.78
+87.78
-394.55
+394.55

Internal energy is denoted by the symbol------

H
S
G
U

Which of the following does not result in an increase in the entropy?

crystallisation of sucrose from solution
rusting of iron
conversion of ice to water
Vapourisation of camphor

Which of the following processes are accompanied by an increase of entropy.
(i) Dissolution of iodine in solvent
(ii) HCI added to AgNO₃ solution and precipitate of AgCI is obtained.
(iii) A partition is removed to allow two gases to mix.

(i) & (ii)
(ii) & (iii)
(i) & (iii)
all the above

Identify the suitable condition(s) which helps the adiabatic process to occur?
(i) ΔT = 0 (ii)ΔP = 0 (iii) q = 0 (iv) w = 0

Only (i)
Only (iii)
(i) and (ii)
(i), (ii) and (iv)

The intensive property among the quantities below is

mass
volume
enthalpy
\(\frac { mass }{ volume } \)

1KJ=-----J

1000
100
10
10,000

The SI unit of entropy is ______

JK
JK^-1
KJ K^-1
KJ / mole

If the heat flows out of the system into the surrounding, the q value becomes -------

+Ve
-Ve
equal to zero
maximum

The values of ΔH and ΔS for a reaction are respectively 30 kJ mol^-1 and 100 JK^-1 mol^-1. Then the temperature above which the reaction will become spontaneous is

300 K
30 K
100 K
200 C

The heat of neutralisation of strong acid and strong base is ------

+57.32 KJ
+75.32 KJ
-75.32 KJ
-57.32 KJ

The gravitational work done by an object is -------

Qv
fx
PV
mgh

The enthalpies of all elements in their standard states are ____

1
0
<0
different for each elements

An ideal gas expands from the volume of 1 x 10^-3 m³to 1 x 10^-2m³ at 300 K against a constant pressure at 1 x 10⁵ Nm^-2. The work done is

- 900 J
900 kJ
270 kJ
-900 kJ

The standard free energy change ΔG⁰ is related to k (equilibrium constant) as

ΔG⁰=RT log k
ΔG⁰=RT log k
ΔG⁰=-2.303 RT log k
ΔG⁰=2.303 RT log k

Pick out the true statement(s).
(i) q and ware path functions
(ii) q + w is a state function

Only (i)
Only (ii)
Both (i) and (ii)
Both are incorrect statements

The process in which no heat can flow into or out of the system are called ----- process.

isothermal
isobasic
isochoric
adiabatic

Molar heat of vapourization of a liquid is 4.8 kJ mol-1. If the entropy change is 16 J mol^-1 K^-1, the boiling point of the liquid is

323 K
27° C
164 K
0.3 K

The heat of formation of CO and CO₂ are - 26.4 kcal and - 94 kcal, respectively. Heat of combustion of carbon monoxide will be

+ 26.4 kcal
- 67.6 kcal
- 120.6 kcal
+ 52.8 kcal

Given that C_(g)+ O_2(g)⟶ CO_2(g)ΔH^o =-akJ;2CO_(g)+O_2(g) ⟶ 2CO_2(g)ΔH^o=-bkJ; Calculate the AHo for the reaction C_(g)+ 1/2O_2(g)⟶ CO_(g)

\(\frac{b+2a}{2}\)
2a-b
\(\frac{2a-b}{2}\)
\(\frac{b-2a}{2}\)

Match the list I with list II and select the correct answer using the code given below the list.

List-I List-II

A ΔS<0 1 I2(s)⟶I2(g)

B ΔG<0 2 \(Ice\overset { 273\quad K }{ \rightleftharpoons } Water\)

C ΔG=0 3 2O_3(g)⟶3O_2(g)

D ΔS>0 4 \(H_{ 2 }O_{ (I) }\overset { 270K }{ \longrightarrow } { H }_{ 2 }O_{ (s) }\)

A B C D

1 2 3 4
A B C D

3 4 1 2
A B C D

1 2 4 3
A B C D

4 3 2 1

Which among the following is not an extensive property?

Volume
internal energy
Mass
temperature

The enthalpy and entropy change for a chemical reactions are -5.3 x 10³ cal and 4.7 cal K^-1 respectively. Predict the nature of the reaction at 298 k.

Non feasible
Reversible
Non-spontaneous
Spontaneous

In an adiabatic process, which of the following is true?

q = w
q = 0
ΔE = q
PΔV= 0

The work done by the liberated gas when 55.85 g of iron (molar mass 55.85 g mol^-1) reacts with hydrochloric acid in an open beaker at 25°C

- 2.48 kJ
-2.22 kJ
+2.22 kJ
+ 2.48 kJ

Change in enthalpy is

Heat absorbed at constant pressure
The total energy change at constant pressure and temperature
Equal to change in internal energy at constant volume
All the above

SI unit of molar heat capacity is------

J mol^-1
KJ mol^-1
JK^-1 mol^-1
JK^-1

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