Thermodynamics Test

Result

Thermodynamics Test - 59

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Weekly Quiz Competition

Question 1
4 / -1

In reaction X → y ∆H = 4 kcal/mol and ∆S = 10 cal/mol K^–1 then at what temperature reaction will be spontaneously ?

A
500 K

B
350 K

C
200 K

D
250 K

Solution
Question 2
4 / -1

For the reaction A + B = C, the values of standard free energy charge for A, B and C are –10, –15 and –25K. cal mol^–1 respectively, then what is the value of equilibrium constant ?

A
Zero

B
One

C
More than one

D
Less than one

Solution
Question 3
4 / -1

If is the change in enthalpy and the change in internal energy accompanying a gaseous reaction

A
∆H is always greater than

B
∆H < ∆E only if the number of moles of the products in greater than the number of the reactants

C
∆H is always less than ∆E

D
∆H < ∆E only if the number of moles of the products is less than the number of moles of the reactants
Question 4
4 / -1

A schematic plot of versus inverse of temperature for a reaction is shown below. The reaction must be

A
Exothermic

B
Endothermic

C
One with neligible enthalpy change

D
Highly spontaneous at ordinary temperature at ordinary temperature
Question 5
4 / -1

The heat of reaction at constant pressure is given by

A

B

C

D
Question 6
4 / -1

2.2016 gm of acetaldehyde produced 13.95 kcal of heat on combustion in O₂. Calculate the heat of combustion of CH₃CHO

A
279 Kcal

B
972 Kcal

C
27.9 Kcal

D
2.79 Kcal

Solution
Question 7
4 / -1

A

B

C

D
Question 8
4 / -1

A
-14.6 kJ mol^-1

B
-16.8 kJ mol^-1

C
+16.8 kJ mol^-1

D
+244.8 kJ mol^-1

Solution
Question 9
4 / -1

A
∆H₁ < ∆H₂

B
∆H₁ + ∆H₂ = 0

C
∆H₁ > ∆H₂

D
∆H₁ = ∆H₂
Question 10
4 / -1

Consider the following Ellingham's diagram for carbon.

A
Upto 710°C, the reaction of formation of CO₂ is energetically more favourable but above 710°C, the formation of CO is preferred

B
Carbon can be used to reduce any metal oxide at a sufficiently high temperature

C
Carbon reduces many oxides at elevated temperature because ∆G° vs temperature line has a negative slope

D

Solution