-
question_answer1)
For a reversible spontaneous change \[\Delta S\] is
A)
\[\frac{\Delta E}{T}\] done
clear
B)
\[\frac{P\,\Delta V}{T}\] done
clear
C)
\[\frac{q}{T}\] done
clear
D)
RT log K done
clear
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question_answer2)
When disorder of a system increases, the change is said to be
A)
Exothermic done
clear
B)
Non-spontaneous done
clear
C)
Endothermic done
clear
D)
Spontaneous done
clear
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question_answer3)
The spontaneous flow of heat is always
A)
From low to high pressure done
clear
B)
From high to high pressure done
clear
C)
Unidirectional from lower temperature to higher temperature done
clear
D)
Unidirectional from the higher to lower temperature done
clear
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question_answer4)
Mixing of non-reacting gases is generally accompanied by
A)
Decrease in entropy done
clear
B)
Increase in entropy done
clear
C)
Change in enthalpy done
clear
D)
Change in free energy done
clear
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question_answer5)
An irreversible process occuring isothermally in an isolated system leads to
A)
Zero entropy done
clear
B)
An increase in the total entropy of the system done
clear
C)
A decrease in the total entropy of the system done
clear
D)
None of these done
clear
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question_answer6)
The entropy values (in JK-1 mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and HCl(g) = 186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction \[{{H}_{2(g)}}+C{{l}_{2(g)}}\to 2HC{{l}_{(g)}}\] is [BHU 2005]
A)
+ 540.3 done
clear
B)
+ 727.3 done
clear
C)
? 166.9 done
clear
D)
+ 19.8 done
clear
View Solution play_arrow
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question_answer7)
Which of the following is the least random state of water
A)
Ice done
clear
B)
Liquid water done
clear
C)
Steam done
clear
D)
All present same random state done
clear
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question_answer8)
Which one of the following process is non-spontaneous
A)
Dissolution of \[CuS{{O}_{4}}\] in water done
clear
B)
Reaction between \[{{H}_{2}}\] and \[{{O}_{2}}\] to form water done
clear
C)
Water flowing down hill done
clear
D)
Flow of electric current from low potential to high potential done
clear
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question_answer9)
Which of the following is zero during adiabatic expansion of the gas
A)
\[\Delta T\] done
clear
B)
\[\Delta S\] done
clear
C)
\[\Delta E\] done
clear
D)
None of these done
clear
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question_answer10)
The entropy of crystalline substances at absolute zero going by the third law of thermodynamics should be taken as [J & K 2005]
A)
100 done
clear
B)
50 done
clear
C)
Zero done
clear
D)
Different for different substances done
clear
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question_answer11)
In which state, the matter have highest entropy
A)
Solid done
clear
B)
Liquid done
clear
C)
Gas done
clear
D)
Equal in all done
clear
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question_answer12)
Which of the following pairs of a chemical reaction is certain to result in spontaneous reaction ? [CBSE PMT 2005]
A)
Exothermic and decreasing disorder done
clear
B)
Endothermic and increasing disorder done
clear
C)
Exothermic and increasing disorder done
clear
D)
Endothermic and decreasing disorder done
clear
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question_answer13)
When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in Kelvin would be [IIT 2005]
A)
\[\frac{T}{{{2}^{(2/3)}}}\] done
clear
B)
T + \[\frac{2}{3\times 0.0821}\] done
clear
C)
T done
clear
D)
T - \[\frac{2}{3\times 0.0821}\] done
clear
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question_answer14)
9.0 gm of \[{{H}_{2}}O\] is vaporised at \[{{100}^{o}}C\] and 1 atm pressure. If the latent heat of vaporisation of water is \[x\,J/gm\], then \[\Delta S\] is given by
A)
\[\frac{x}{373}\] done
clear
B)
\[\frac{18x}{100}\] done
clear
C)
\[\frac{18x}{373}\] done
clear
D)
\[\frac{1}{2}\times \frac{18x}{373}\] done
clear
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question_answer15)
The \[\Delta S\] for the vaporisation of 1 mol of water is 88.3 J/mole K. The value of \[\Delta S\] for the condensation of 1 mol of vapour will be
A)
88.3 J/mol K done
clear
B)
\[{{(88.3)}^{2}}\] J/mol K done
clear
C)
? 88.3 J/mol K done
clear
D)
\[\frac{1}{88.3}\] J/mol K done
clear
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question_answer16)
For which reaction from the following, \[\Delta S\] will be maximum [AlIMS 1982, 83, 94; AMU 2000]
A)
\[Ca(s)+\frac{1}{2}{{O}_{2}}(g)\to CaO(s)\] done
clear
B)
\[CaC{{O}_{3}}(s)\to CaO(s)+C{{O}_{2}}(g)\] done
clear
C)
\[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] done
clear
D)
\[{{N}_{2}}(g)+{{O}_{2}}(g)\to 2NO(g)\] done
clear
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question_answer17)
The occurrence of a reaction is impossible if [AIIMS 1982, 91; MP PET 1997; MP PMT 1999; DPMT 2002]
A)
\[\Delta H\] is +ve ; \[\Delta S\] is also + ve but \[\Delta H<T\Delta S\] done
clear
B)
\[\Delta H\] is ? ve ; \[\Delta S\] is also ? ve but \[\Delta H\,>\,T\Delta S\] done
clear
C)
\[\Delta H\] is ? ve ; \[\Delta S\] is + ve done
clear
D)
\[\Delta H\] is + ve ; \[\Delta S\] is ? ve done
clear
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question_answer18)
If the enthalpy of vaporization for water is 186.5 kJ \[mo{{l}^{-1}}\], the entropy of its vaporization will be [CPMT 1988; DCE 2000]
A)
\[0.5\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
B)
\[1.0\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
C)
\[1.5\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
D)
\[2.0\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
View Solution play_arrow
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question_answer19)
Which of the following statement is true. The entropy of the universe [MP PMT 1993; CET Pune 1998]
A)
Increases and tends towards maximum value done
clear
B)
Decreases and tends to be zero done
clear
C)
Remains constant done
clear
D)
Decreases and increases with a periodic rate done
clear
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question_answer20)
When enthalpy and entropy change for a chemical reaction are \[-2.5\,\times {{10}^{3}}\,cal\] and \[7.4\,cal\] \[{{\deg }^{-1}}\] respectively. Predict the reaction at \[298\,K\] is [AFMC 1998; MH CET 1999; CBSE PMT 2000]
A)
Spontaneous done
clear
B)
Reversible done
clear
C)
Irreversible done
clear
D)
Non-spontaneous done
clear
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question_answer21)
The total entropy change for a system and its surroundings increases, if the process is
A)
Reversible done
clear
B)
Irreversible done
clear
C)
Exothermic done
clear
D)
Endothermic done
clear
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question_answer22)
For chemical reactions, the calculation of change in entropy is normally done
A)
At constant pressure done
clear
B)
At constant temperature done
clear
C)
At constant temperature and pressure both done
clear
D)
At constant volume done
clear
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question_answer23)
When the value of entropy is greater, then the ability of work
A)
Is maximum done
clear
B)
Is minimum done
clear
C)
Is medium done
clear
D)
None of these done
clear
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question_answer24)
Which of the following is true for the reaction \[{{H}_{2}}O(l)\]⇌\[{{H}_{2}}O(g)\] at \[{{100}^{o}}C\] and 1 atmosphere [KCET 1991; AIIMS 1996]
A)
\[\Delta E=0\] done
clear
B)
\[\Delta H=0\] done
clear
C)
\[\Delta H=\Delta E\] done
clear
D)
\[\Delta H=T\Delta S\] done
clear
View Solution play_arrow
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question_answer25)
The enthalpy change for the transition of liquid water to steam, \[\Delta {{H}_{vap}}=37.3\,kJ\,mo{{l}^{-1}}\] at \[373\,K\]. The entropy change for the process is [MP PET 1994]
A)
\[111.9\,J\,mo{{l}^{-1}}{{K}^{-1}}\] done
clear
B)
\[37.3\,J\,mo{{l}^{-1}}\,{{K}^{-1}}\] done
clear
C)
\[100\,J\,mo{{l}^{-1}}{{K}^{-1}}\] done
clear
D)
\[74.6\,J\,mo{{l}^{-1}}{{K}^{-1}}\] done
clear
View Solution play_arrow
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question_answer26)
When a solid is converted into liquid, entropy [MP PET 1993, 95; MP PMT 1996]
A)
Becomes zero done
clear
B)
Remains the same done
clear
C)
Decreases done
clear
D)
Increases done
clear
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question_answer27)
In a spontaneous process, the entropy of the system and its surroundings [MP PET 1996; NCERT 1975]
A)
Equals zero done
clear
B)
Decreases done
clear
C)
Increases done
clear
D)
Remains constant done
clear
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question_answer28)
The positive value of \[\Delta S\] indicates that [MP PMT 1997]
A)
The system becomes less disordered done
clear
B)
The system becomes more disordered done
clear
C)
The system is in equilibrium position done
clear
D)
The system tends to reach at equilibrium position done
clear
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question_answer29)
For reaction \[2Cl(s)\to C{{l}_{2}}(s)\], the signs of \[\Delta H\] and \[\Delta S\] respectively are [KCET 1996]
A)
+, ? done
clear
B)
+, + done
clear
C)
?, ? done
clear
D)
?, + done
clear
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question_answer30)
The enthalpy of water is \[386\,kJ\]. What is entropy of water [BHU 1997]
A)
0.5 kJ done
clear
B)
1.03 kJ done
clear
C)
1.5 kJ done
clear
D)
22.05 kJ done
clear
View Solution play_arrow
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question_answer31)
For which of the processes is \[\Delta S\] negative [Pb. PMT 1998]
A)
\[{{H}_{2}}(g)\to 2H(g)\] done
clear
B)
\[{{N}_{2}}(g)\,1atm\to {{N}_{2}}(g)\,8\,atm\] done
clear
C)
\[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] done
clear
D)
\[{{C}_{(diamond)}}\to {{C}_{(graphite)}}\] done
clear
View Solution play_arrow
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question_answer32)
Identify the correct statement regarding entropy [CBSE PMT 1998; BHU 2001]
A)
At \[{{0}^{o}}C\], the entropy of a perfectly crystalline substance is taken to be zero done
clear
B)
At absolute zero of temperature, the entropy of a perfectly crystalline substance is \[+ve\] done
clear
C)
At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero done
clear
D)
At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero done
clear
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question_answer33)
One mole of an ideal gas at \[300K\] is expanded isothermally from an initial volume of 1 litre to 10 litres. The change in energy for this process is \[(R=2\,cal\,mo{{l}^{-1}}{{K}^{-1}})\] [CBSE PMT 1998]
A)
163.7 cal done
clear
B)
850.2 cal done
clear
C)
1381.1 cal done
clear
D)
Zero done
clear
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question_answer34)
If \[900\,J/g\] of heat is exchanged at boiling point of water, then what is increase in entropy [BHU 1998]
A)
43.4 J/mole done
clear
B)
87.2 J/mole done
clear
C)
900 J/mole done
clear
D)
Zero done
clear
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question_answer35)
A container has hydrogen and oxygen mixture in ratio of 4 : 1 by weight, then [BHU 1998]
A)
Internal energy of the mixture decreases done
clear
B)
Internal energy of the mixture increases done
clear
C)
Entropy of the mixture increases done
clear
D)
Entropy of the mixture decreases done
clear
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question_answer36)
If 0.75 mole of an ideal gas expands isothermally at \[{{27}^{o}}C\] from 15 litres to 25 litres, the maximum work obtained is [AFMC 1999]
A)
8.40 J done
clear
B)
9.34 J done
clear
C)
10.86 J done
clear
D)
10.43 J done
clear
View Solution play_arrow
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question_answer37)
In which of the following conditions a chemical reaction can not occur [AMU 1999]
A)
\[\Delta H\] and\[\Delta S\] increase and \[T\Delta S>\Delta H\] done
clear
B)
\[\Delta H\] and \[\Delta S\] decrease and \[\Delta H>T\Delta S\] done
clear
C)
\[\Delta H\] increases and \[\Delta S\] decreases done
clear
D)
\[\Delta H\] decreases and \[\Delta S\] increases done
clear
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question_answer38)
An engine operating between \[{{150}^{o}}C\] and \[{{25}^{o}}C\] takes 500 J heat from a higher temperature reservoir if there are no frictional losses, then work done by engine is [MH CET 1999]
A)
147.7 J done
clear
B)
157.75 J done
clear
C)
165.85 J done
clear
D)
169.95 J done
clear
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question_answer39)
The entropy of a perfectly crystalline solid at absolute zero is [AMU 2000]
A)
Positive done
clear
B)
Negative done
clear
C)
Zero done
clear
D)
Not definite done
clear
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question_answer40)
Which of the following conditions will always lead to a non-spontaneous change [AMU 2000; KCET (Med.) 2000]
A)
Positive \[\Delta H\] and positive \[\Delta S\] done
clear
B)
Negative \[\Delta H\] and negative \[\Delta S\] done
clear
C)
Positive \[\Delta H\] and negative \[\Delta S\] done
clear
D)
Negative \[\Delta H\] and positive \[\Delta S\] done
clear
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question_answer41)
Following data is known about melting of a compound AB. \[\Delta H=9.2\,kJ\,mo{{l}^{-1}}\], \[\Delta S=0.008\,kJ\,{{K}^{-1}}mo{{l}^{-1}}\]. Its melting point is [Pb. PMT 2000; AIIMS 2000]
A)
736 K done
clear
B)
1050 K done
clear
C)
\[1150\,K\] done
clear
D)
\[{{1150}^{o}}C\] done
clear
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question_answer42)
The volume of a gas decreases from \[500\,cc\] to \[300\,cc\] when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is [Pb. PMT 2000]
A)
? 2.16 J done
clear
B)
12.156 J done
clear
C)
2.16 J done
clear
D)
101.3 J done
clear
View Solution play_arrow
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question_answer43)
The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.690 and \[205\,J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}(g)\] is [CPMT 2001]
A)
\[1.86\,J{{K}^{-1}}\] done
clear
B)
\[1.96\,J{{K}^{-1}}\] done
clear
C)
\[2.81\,J{{K}^{-1}}\] done
clear
D)
\[2.86\,J{{K}^{-1}}\] done
clear
View Solution play_arrow
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question_answer44)
Which of the following endothermic processes are spontaneous [CBSE PMT 2001]
A)
Melting of ice done
clear
B)
Evaporation of water done
clear
C)
Heat of combustion done
clear
D)
Both A and B done
clear
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question_answer45)
For the reaction \[{{H}_{2}}O(s)\] ⇌ \[{{H}_{2}}O(l)\] at \[{{0}^{o}}C\] and normal pressure [KCET 2001]
A)
\[\Delta H>T\Delta S\] done
clear
B)
\[\Delta H=T\Delta S\] done
clear
C)
\[\Delta H=\Delta G\] done
clear
D)
\[\Delta H<T\Delta S\] done
clear
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question_answer46)
One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of \[{{27}^{o}}C\]. If the work done during the process is 3 kJ, the final temperature will be equal to \[({{C}_{v}}=20\,J{{K}^{-1}})\] [KCET 2000; AFMC 2000; AIIMS 2001]
A)
150 K done
clear
B)
100 K done
clear
C)
\[{{26.85}^{o}}C\] done
clear
D)
295 K done
clear
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question_answer47)
The entropy change, in the conversion of one mole of liquid water at 373 K to vapour at the same temperature is (Latent heat of vaporization of water, \[\Delta {{H}_{vap}}=2.257\,kJ/g)\] [AFMC 2002; KCET 2002]
A)
105.9\[J{{k}^{-1}}\] done
clear
B)
\[107.9\,\,J{{k}^{-1}}\] done
clear
C)
\[108.9\,\,J{{k}^{-1}}\] done
clear
D)
\[109.9\,\,J{{k}^{-1}}\] done
clear
View Solution play_arrow
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question_answer48)
A heat engine absorbs heat \[{{Q}_{1}}\] at temperature \[{{T}_{1}}\] and heat \[{{Q}_{2}}\] at temperature \[{{T}_{2}}\]. Work done by the engine is \[({{Q}_{1}}+{{Q}_{2}})\]. This data [AIEEE 2002]
A)
Violates Ist law of thermodynamics done
clear
B)
Violates Ist law of thermodynamics if \[{{Q}_{1}}\] is ?ve done
clear
C)
Violates Ist law of thermodynamics if \[{{Q}_{2}}\] is ?ve done
clear
D)
Does not violate Ist law of thermodynamics done
clear
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question_answer49)
Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. The ratio of specific heats of the mixture \[({{C}_{p}}/{{C}_{v}})\] will be [AFMC 2002]
A)
1 done
clear
B)
2 done
clear
C)
1.67 done
clear
D)
1.5 done
clear
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question_answer50)
The law formulated by Dr. Nernst is [Kerala (Med.) 2002]
A)
First law of thermodynamics done
clear
B)
Second law of thermodynamics done
clear
C)
Third law of thermodynamics done
clear
D)
Both A and B done
clear
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question_answer51)
The unit of entropy is [CBSE PMT 2002]
A)
\[J\,mo{{l}^{-1}}\] done
clear
B)
\[JK\,mo{{l}^{-1}}\] done
clear
C)
\[J\,mo{{l}^{-1}}{{K}^{-1}}\] done
clear
D)
\[{{J}^{-1}}{{K}^{-1}}mo{{l}^{1}}\] done
clear
View Solution play_arrow
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question_answer52)
The entropy changed involved in the conversion of 1 mole of liquid water at 373 K to vapour at the same temperature will be \[[\Delta {{H}_{\text{vap}}}=2.257kJ/gm]\] [MP PET 2002]
A)
0.119 kJ done
clear
B)
0.109 kJ done
clear
C)
0.129 kJ done
clear
D)
0.120 kJ done
clear
View Solution play_arrow
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question_answer53)
When a liquid boils, there is [JIPMER 2002]
A)
An increase in entropy done
clear
B)
A decrease in entropy done
clear
C)
An increase in heat of vaporization done
clear
D)
An increase in free energy done
clear
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question_answer54)
Which one of the following has \[\Delta {{S}^{o}}\] greater than zero [AIIMS 2003]
A)
\[CaO+C{{O}_{2}}(g)\]⇌ \[CaC{{O}_{3}}(s)\] done
clear
B)
\[NaCl\,(aq)\] ⇌ \[NaCl(s)\] done
clear
C)
\[NaN{{O}_{3}}(s)\] ⇌ \[N{{a}^{+}}(aq)+NO_{3}^{-}(aq)\] done
clear
D)
\[{{N}_{2}}(g)+3{{H}_{2}}(g)\] ⇌ \[2N{{H}_{3}}(g)\] done
clear
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question_answer55)
The molar heat capacity of water at constant pressure is \[75\,\,J{{K}^{-1}}mo{{l}^{-1}}\]. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand the increase in temperature of water is [CBSE PMT 2003]
A)
6.6 K done
clear
B)
1.2 K done
clear
C)
2.4 K done
clear
D)
4.8 K done
clear
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question_answer56)
The work done to contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process [MP PMT 2003]
A)
+ 590 joules done
clear
B)
? 334 joules done
clear
C)
+ 334 joules done
clear
D)
? 590 joules done
clear
View Solution play_arrow
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question_answer57)
Highest entropy is in [BVP 2003]
A)
Hydrogen done
clear
B)
Water done
clear
C)
Graphite done
clear
D)
Mercury done
clear
View Solution play_arrow
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question_answer58)
\[\underset{{{S}^{o}}(298\,K)\,{{K}^{-1}}mo{{l}^{-1}}}{\mathop{{{H}^{+}}(aq)}}\,+\underset{-10.7}{\mathop{O{{H}^{-}}(aq)}}\,\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O(l)}}\,\] Standard entropy change for the above reaction is [DPMT 2004]
A)
\[60.3\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
B)
\[80.7\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
C)
\[-70\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
D)
\[+10.7\,J{{K}^{-1}}mo{{l}^{-1}}\] done
clear
View Solution play_arrow
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question_answer59)
One mole of water at \[{{100}^{o}}C\] is converted into steam at \[{{100}^{o}}C\] at a constant pressure of 1 atm. The change in entropy is [heat of vaporisation of water at \[{{100}^{o}}C=540\,cal/gm\]] [Pb. PMT 2004]
A)
8.74 done
clear
B)
18.76 done
clear
C)
24.06 done
clear
D)
26.06 done
clear
View Solution play_arrow
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question_answer60)
For a car not engine, the source is at \[500K\] and the sink at \[300K\]. What is efficiency of this engine [BHU 2004]
A)
0.2 done
clear
B)
0.4 done
clear
C)
0.6 done
clear
D)
0.3 done
clear
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question_answer61)
Heat require to raise the temperature of 1 mol of a substance by \[{{1}^{o}}C\] is called [DCE 2002]
A)
Specific heat done
clear
B)
Molar heat capacity done
clear
C)
Water equivalent done
clear
D)
Specific gravity done
clear
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question_answer62)
Maximum entropy will be in which of the following [DCE 2004]
A)
Ice done
clear
B)
Liquid water done
clear
C)
Snow done
clear
D)
Water vapours done
clear
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question_answer63)
The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.740 and 205 \[J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}\] is [Pb. CET 2001]
A)
\[2.76\,J{{K}^{-1}}\] done
clear
B)
\[2.12\,J{{K}^{-1}}\] done
clear
C)
\[1.12\,J{{K}^{-1}}\] done
clear
D)
\[1.40\,J{{K}^{-1}}\] done
clear
View Solution play_arrow
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question_answer64)
Which law of thermodyanamics help in calculating entropy at different temperatures [Pb. CET 2003]
A)
First law done
clear
B)
Second law done
clear
C)
Third law done
clear
D)
Zeroth law done
clear
View Solution play_arrow
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question_answer65)
Entropy is maximum in case of [BVP 2004]
A)
Steam done
clear
B)
Water at \[{{0}^{o}}C\] done
clear
C)
Water at \[{{4}^{o}}C\] done
clear
D)
Ice done
clear
View Solution play_arrow
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question_answer66)
Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is [CBSE PMT 2004]
A)
\[\Delta {{S}_{system}}>0\] only done
clear
B)
\[\Delta {{S}_{surroundings}}>0\] only done
clear
C)
\[\Delta {{S}_{system}}+\Delta {{S}_{surroundings}}>0\] done
clear
D)
\[\Delta {{S}_{system}}-\Delta {{S}_{surroundings}}>0\] done
clear
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question_answer67)
A process is taking place at constant temperature and pressure. Then [KCET 2004]
A)
\[\Delta H=\Delta E\] done
clear
B)
\[\Delta H=T\Delta S\] done
clear
C)
\[\Delta H=0\] done
clear
D)
\[\Delta S=0\] done
clear
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question_answer68)
The enthalpy of vapourization of a liquid is \[30\,kJ\,mo{{l}^{-1}}\] and entropy of vapourization is \[75\,J\,mo{{l}^{-1}}K\]. The boiling point of the liquid at 1 atm is [IIT JEE (Screening) 2004]
A)
250K done
clear
B)
400K done
clear
C)
450K done
clear
D)
600K done
clear
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