Thermodynamics Test

Result

Thermodynamics Test - 70

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following processes are spontaneous

A
Melting of ice at $$2$$ atm and $$273K$$

B
Melting point of ice at $$1/2$$ atm and$$273K$$

C
Boiling of water at $$1/2$$ atm and $$373K$$

D
Boiling of water at $$2$$ atm and $$373K$$

Solution
Question 2
1 / -0

Consider the following processes $$\triangle H(KJ/mol)$$
$$\frac { 1 }{ 2 } A\rightarrow B$$ $$+150$$
$$3B\rightarrow 2C+D$$ $$-125$$
$$E+A\rightarrow D$$ $$+350$$
For $$B+D\rightarrow E+2C$$, $$\triangle H$$ will be :

A
$$325 kJ/ mol$$

B
$$525 kJ/ mol$$

C
$$-175 kJ/mol$$

D
$$-325 kJ/mol$$

Solution
Question 3
1 / -0

$$\triangle H$$ = - 336.2 kcal. What is the value of $$\triangle U$$ approximately at 300 K for the same reaction (R = 2 cal $$degre{ e }^{ -1 }$$ $$mo{ l }^{ -1 }$$)?

A
- 320.0 kcal

B
- 335.0 kcal

C
- 337.2 kcal

D
- 353.0 kcal
Question 4
1 / -0

Which of the following is/are correct ?

A
$$\Delta H=\Delta U+\Delta $$ (PV) when P and V both changes

B
$$\Delta H=\Delta U+P\Delta V$$ when pressure is constant

C
$$\Delta H=\Delta U+V\Delta P$$ when volume is constant

D
all are correct

Solution
Question 5
1 / -0

The reaction $$2A(g)\rightarrow A_{2}(g)$$, will be spontaneous

A
At high temperature

B
At low temperature

C
At all temperature

D
Never at any temperature
Question 6
1 / -0

Which of the following is/are not correct if reaction quotient (Q)=1?

A
$$\Delta G=0$$

B
$$\Delta G^{0}=0$$

C
$$\Delta S^{0}=0$$

D
$$\Delta G=\Delta G^0$$
Question 7
1 / -0

Given the following data:
Substance   $$\Delta H$$(KJ/mol) $${S^ \circ }$$(J/mol K) $$\Delta G\,\,\,$$(KJ/mol)
FeO(s) -266.3        57.49 -245.12
C(Graphite)   0 5.74 0
Fe(s) 0 27.28 0
CO(g) -110.5 197.6 -137.15
Determine at what temperature the following reaction is spontaneous ?
$${\text{FeO}}\left( {\text{s}} \right){\text{ + C}}\left( {{\text{Graphite}}} \right) \to {\text{Fe}}\left( {\text{s}} \right){\text{ + CO}}\left( {\text{g}} \right)$$

A
289 K

B
668 K

C
966 K

D
$${{\text{G}}^{\text{o}}}$$ is $${\text{ + ve}}$$. hence the reaction will never be spontaneous

Solution
Question 8
1 / -0

For the process,$${\text{C}}{{\text{O}}_{\text{2}}}\left( s \right) \to \,{\text{C}}{{\text{O}}_{\text{2}}}\left( g \right)$$

A
Both $${{\Delta H}}\,\,\,\,$$ and $${{\Delta S}}$$ are negative

B
$${{\Delta H}}\,\,\,\,$$ is negative and $${{\Delta S}}$$ is positive

C
$${{\Delta H}}\,\,\,\,$$ is +Ve and $${{\Delta S}}$$ is negative

D
Both $${{\Delta H}}\,\,\,\,$$ and $${{\Delta S}}$$ are positive

Solution
Question 9
1 / -0

Spontaneity may be observed in following conditions

A
$$\triangle H$$ = -ve, $$\triangle S$$ = +ve

B
$$\triangle H$$ = +ve, $$\triangle S$$ = +ve

C
$$\triangle H$$ = -ve, $$\triangle S$$ = -ve

D
All of these

Solution

When the process is exothermic $$ (\triangle H _{system} < 0 ),$$
and the entropy of the system increases
($$ \triangle $$ system $$ > 0), \triangle G $$ will be negative at
all temperatures. Thus, the process is always
spontaneous.
Question 10
1 / -0

The correct thermodynamic conditions for the spontaneous reaction at all temperature is:

A
$$\Delta H < 0$$ and $$\Delta S = 0$$

B
$$\Delta H > 0$$ and $$\Delta S < 0$$

C
$$\Delta H < 0$$ and $$\Delta S > 0$$

D
$$\Delta H < 0$$ and $$\Delta S < 0$$

Solution