Thermochemistry and Thermodynamics Test 4

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:The temperature of the system decreases in an

Answers Choices:

Adiabatic compression

Isothermal compression

Isothermal expansion

Adiabatic expansion

Questions 2 of 50

Question:For the isothermal expansion of an ideal gas

Answers Choices:

E and H increases

E increases but H decreases

H increases but E decreases

E and H are unaltered

Questions 3 of 50

Question:Which of the following is not a state function

Answers Choices:

Internal energy

Enthalpy

Work

Entropy

Questions 4 of 50

Question:Among them intensive property is

Answers Choices:

Mass

Volume

Surface tension

Enthalpy

Questions 5 of 50

Question:Hess law is applicable for the determination of heat of

Answers Choices:

Reaction

Formation

Transition

All of these

Questions 6 of 50

Question:Enthalpy for the reaction \(C + {O_2} \to C{O_2}\) is

Answers Choices:

Positive

Negative

Zero

None

Questions 7 of 50

Question:In which of the following \(\Delta E = \Delta H\)

Answers Choices:

\({N_2}{O_4}(g)\) \( \leftrightarrow \) \(2N{O_2}(g)\)

\(2S{O_2}(g) + {O_2}(g)\) \( \leftrightarrow \) \(2S{O_3}(g)\)

\({H_2}(g) + {I_2}(g)\) \( \leftrightarrow \) \(2HI(g)\)

\({H_2}(g) + \frac{1}{2}{O_2}(g)\) \( \leftrightarrow \) \({H_2}O(l)\)

Questions 8 of 50

Question:In an adiabatic expansion of an ideal gas

Answers Choices:

\(W = - \Delta E\)

\(W = \Delta E\)

\(\Delta E = 0\)

\(W = 0\)

Questions 9 of 50

Question:Enthalpy \((H)\) is equal to

Answers Choices:

Internal energy

Product of pressure (P) and volume (V) of gas

Internal energy +PV

Work (W) done by a system

Questions 10 of 50

Question:\(\Delta {E^o}\) of combustion of isobutylene is \( - X\,kJ\,mo{l^{ - 1}}\). The value of \(\Delta {H^o}\) is

Answers Choices:

\( = \Delta {E^o}\)

\( > \Delta {E^o}\)

\( = 0\)

\( < \Delta {E^o}\)

Questions 11 of 50

Question:The entropy values (in JK\(^{ - {\rm{1}}}\) mol\(^{ - {\rm{1}}}\)) of H\(_{{\rm{2}}\left( g \right)}\) = 130.6, Cl\(_{{\rm{2}}\left( g \right)}\) = 223.0 and HCl\(_{\left( g \right)}\) = 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

Answers Choices:

540.3

727.3

166.9

19.8

Questions 12 of 50

Question:Which of the following is the least random state of water

Answers Choices:

Ice

Liquid water

Steam

All present same random state

Questions 13 of 50

Question:For chemical reactions, the calculation of change in entropy is normally done

Answers Choices:

At constant pressure

At constant temperature

At constant temperature and pressure both

At constant volume

Questions 14 of 50

Question:When the value of entropy is greater, then the ability of work

Answers Choices:

Is maximum

Is minimum

Is medium

None of these

Questions 15 of 50

Question: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

Answers Choices:

147.7 J

157.75 J

165.85 J

169.95 J

Questions 16 of 50

Question:The entropy of a perfectly crystalline solid at absolute zero is

Answers Choices:

Positive

Negative

Zero

Not definite

Questions 17 of 50

Question:Which one of the following has \(\Delta {S^o}\) greater than zero

Answers Choices:

\(CaO + C{O_2}(g)\) \( \leftrightarrow \) \(CaC{O_3}(s)\)

\(NaCl\,(aq)\) \( \leftrightarrow \) \(NaCl(s)\)

\(NaN{O_3}(s)\) \( \leftrightarrow \) \(N{a^ + }(aq) + NO_3^ - (aq)\)

\({N_2}(g) + 3{H_2}(g)\) \( \leftrightarrow \) \(2N{H_3}(g)\)

Questions 18 of 50

Question: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

Answers Choices:

6.6 K

1.2 K

2.4 K

4.8 K

Questions 19 of 50

Question:Molar heat of vaporisation of a liquid is \(6kJ\,mo{l^{ - 1}}\). If the entropy change is \(16J\,mo{l^{ - 1}}\,{K^{ - 1}}\), the boiling point of the liquid is

Answers Choices:

\({375^o}C\)

\(375K\)

\(273K\)

\({102^o}C\)

Questions 20 of 50

Question:The enthalpy of fusion of ice per mole

Answers Choices:

18 kJ

8 kJ

80 kJ

6 kJ

Questions 21 of 50

Question:If \(\Delta H_f^o\) for \({H_2}{O_2}\) and \({H_2}O\) are \( - 188\,kJ/mole\) and \( - 286\,kJ/mole\). What will be the enthalpy change of the reaction \(2{H_2}{O_2}(l) \to 2{H_2}O(l) + {O_2}(g)\)

Answers Choices:

\( - 196\,kJ/mole\)

\(146\,kJ/mole\)

\( - 494\,kJ/mole\)

\( - 98\,kJ/mole\)

Questions 22 of 50

Question:The heat of transition \((\Delta {H_t})\) of graphite into diamond would be, where \(C({\rm{graphite}}) + {O_2}(g) \to C{O_2}(g);\,\,\Delta H = x\,kJ\) , \(C({\rm{diamond}})\, + {C_2}(g) \to C{O_2}(g);\,\,\Delta H = y\,kJ\)

Answers Choices:

\((x + y)\,kJ\,mo{l^{ - 1}}\)

\((x - y)\,kJ\,mo{l^{ - 1}}\)

\((y - x)\,kJ\,mo{l^{ - 1}}\)

None of these

Questions 23 of 50

Question:Heat of neutralisation of a strong acid by a strong base is a constant value because

Answers Choices:

Salt formed does not hydrolyse

Only \({H^ + }\) and \(O{H^ - }\) ions react in every case

The strong base and strong acid react completely

The strong base and strong acid react in aqueous solution

Questions 24 of 50

Question:Heat of neutralisation of an acid by a base is highest when

Answers Choices:

Both the acid and base are weak

Both the acid and base are strong

The acid is strong and the base is weak

The acid is weak and the base is strong

Questions 25 of 50

Question:Which is the best definition of “heat of neutralization”

Answers Choices:

The heat set free when one gram molecule of a base is neutralized by one gram molecule of an acid in dilute solution at a stated temperature

The heat absorbed when one gram molecule of an acid is neutralized by one gram molecule of a base in dilute solution at a stated temperature

The heat set free or absorbed when one gram atom of an acid is neutralized by one gram atom of a base at a stated temperature

The heat set free or absorbed when a normal solution containing one gram equivalent of an acid is neutralized by a normal solution containing one gram equivalent of a base at a stated

The heat set free when one gram equivalent of an acid is neutralized by one gram equivalent of a base in dilute solution at a stated temperature

Questions 26 of 50

Question:The compound with negative heat of formation are known as

Answers Choices:

Endothermic compound

Exothermic compound

Heat of formation compound

None of the above

Questions 27 of 50

Question:If \({H^ + } + O{H^ - } \to {H_2}O + 13.7\,kcal\), then the heat of neutralization for complete neutralization of one mole of \({H_2}S{O_4}\) by base will be

Answers Choices:

13.7 kcal

27.4 kcal

6.85 kcal

3.425 kcal

Questions 28 of 50

Question:The enthalpy of formation of ammonia is \( - 46.0\,kJ\,mo{l^{ - 1}}\). The enthalpy change for the reaction \(2N{H_3}(g) \to 2{N_2}(g) + 3{H_2}(g)\) is

Answers Choices:

46.0 kJ \(mo{l^{ - 1}}\)

92.0 kJ \(mo{l^{ - 1}}\)

23.0 kJ \(mo{l^{ - 1}}\)

92.0 kJ \(mo{l^{ - 1}}\)

Questions 29 of 50

Question:The heat of combustion of benzene determined in a bomb calorimeter is \( - 870\,kcal\,mo{l^{ - 1}}\) at \({25^o}C\). The value of \(\Delta E\) for the reaction is

Answers Choices:

\( - 1740\,kcal\)

\( - 870\,kcal\)

\( - 872\,kcal\)

\( - 874\,kcal\)

Questions 30 of 50

Question:The formation of water from \({H_2}(g)\) and \({O_2}(g)\) is an exothermic reaction because

Answers Choices:

The chemical energy of \({H_2}(g)\) and \({O_2}(g)\) is more than that of water

The chemical energy of \({H_2}(g)\) and \({O_2}(g)\) is less than that of water

Not dependent on energy

The temperature of \({H_2}(g)\) and \({O_2}(g)\) is more than that of water

Questions 31 of 50

Question:The energy evolved is highest for which of the following reactions

Answers Choices:

\(F + {e^ - } \to {F^{ - 1}}\)

\(Cl + {e^ - } \to C{l^ - }\)

\(S + 2{e^ - } \to {S^{2 - }}\)

\(O + 2{e^ - } \to {O^{2 - }}\)

Questions 32 of 50

Question:In the combustion of \(2.0\,gm\) of methane \(25\,kcal\) heat is liberated, heat of combustion of methane would be

Answers Choices:

\(100\,kcal\)

\(200\,kcal\)

\(300\,kcal\)

\(400\,kcal\)

Questions 33 of 50

Question:Complete combustion of \(C{H_4}\) gives

Answers Choices:

\(C{O_2} + {H_2}O\)

\(C{O_2} + {H_2}\)

\(COC{l_2}\)

\(CO + C{O_2} + {H_2}O\)

Questions 34 of 50

Question:In the complete combustion of butanol \({C_4}{H_9}OH(l)\), if \(\Delta H\) is enthalpy of combustion and \(\Delta E\) is the heat of combustion at constant volume, then

Answers Choices:

\(\Delta H < \Delta E\)

\(\Delta H = \Delta E\)

\(\Delta H > \Delta E\)

\(\Delta H,\,\Delta E\)

Questions 35 of 50

Question:\(C + {O_2} \to C{O_2};\,\Delta H = X\) , \(CO + \frac{1}{2}{O_2} \to C{O_2};\,\Delta H = Y\) . Then the heat of formation of \(CO\) is

Answers Choices:

\(X - Y\)

\(Y - 2X\)

\(X + Y\)

\(2X - Y\)

Questions 36 of 50

Question:The values of heat of formation of \(S{O_2}\) and \(S{O_3}\) are \( - 298.2\,kJ\) and \( - 98.2\,kJ\). The heat of reaction of the following reaction will be \(S{O_2} + \frac{1}{2}{O_2} \to S{O_3}\)

Answers Choices:

\( - 200\,kJ\)

\( - 356.2\,kJ\)

\( + 200\,kJ\)

\( - 396.2\,kJ\)

Questions 37 of 50

Question:Given that \(C(s) + {O_2}(g) \to C{O_2}(g),\Delta H = - 394kJ\), \(2{H_2}(g) + {O_2}(g) \to 2{H_2}O(l),\,\Delta H = 568kJ\), \(C{H_4}(g) + 2{O_2}(g)\,\, \to \,\,C{O_2}(g) + 2{H_2}O(l)\)\(\Delta H = - 892\,kJ\). Heat of formation of \(C{H_4}\) is

Answers Choices:

70 kJ

71.8 kJ

244 kJ

+ 782 kJ

Questions 38 of 50

Question:Calculate the heat of formation of \(PC{l_5}(s)\) from the following data \(2P(s) + 3C{l_2}(g)\,\, \to \,\,2PC{l_3}(l);\,\Delta H = - 151.8\,kcal\), \(PC{l_3}(l) + C{l_2}(g)\,\, \to \,\,PC{l_5}(s);\,\,\Delta H = - 32.8\,kcal\)

Answers Choices:

108.7 kcal

+ 108.7 kcal

184.6 kcal

+ 184.6 kcal

Questions 39 of 50

Question:The heat of formation of methane \(C(s) + 2{H_2}(g)\, \to \,C{H_4}(g)\) at constant pressure is 18500 cal at \({25^o}C\). The heat of reaction at constant volume would be

Answers Choices:

17904 cal

18202 cal

18798 cal

19096 cal

Questions 40 of 50

Question:The enthalpy of combustion of \({C_6}{H_{6(l)}}\) is -3250 kJ. When 0.39 g of benzene is burnt excess of oxygen in an open vessel, the amount of heat evolved is

Answers Choices:

16.25 J

16.25 kJ

32.5 J

32.5 kJ

Questions 41 of 50

Question:A cylinder of gas is assumed to contain 11.2 kg of butane \(({C_4}{H_{10}})\). If a normal family needs 20000 kJ of energy per day. The cylinder will last: (Given that \(\Delta H\) for combustion of butane is -2658 kJ)

Answers Choices:

20 days

25 days

26 days

24 days

Questions 42 of 50

Question:Compounds with high heat of formation are less stable because

Answers Choices:

High temperature is required to synthesise them

Molecules of such compounds are distorted

It is difficult to synthesis them

Energy rich state leads to instability

Questions 43 of 50

Question:What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene?

Answers Choices:

9.6 kg

96.0 kg

6.4 kg

2.8 kg

Questions 44 of 50

Question:For complete neutralization of \(HCl\) with \(NaOH,\) the heat of neutralization is

Answers Choices:

\( + 13.70\,kJ\,mo{l^{ - 1}}\)

\( - 13.70\,kJ\,mo{l^{ - 1}}\)

\( - 57.32\,kJ\,mo{l^{ - 1}}\)

\( + 57.32\,kJ\,mo{l^{ - 1}}\)

Questions 45 of 50

Question:The bond dissociation energies of gaseous \({H_2},\,C{l_2}\) and \(HCl\) are 104, 58 and 103 kcal respectively. The enthalpy of formation of \(HCl\) gas would be

Answers Choices:

44 kcal

44 kcal

22 kcal

22 kcal

Questions 46 of 50

Question:The first ionization energy for Li is 5.4 eV and electron affinity of Cl is 3.61eV. The \(\Delta H\) (in kJ/mol) for the reaction \(Li(g) + Cl(g) \to L{i^ + } + C{l^ - }\) is (if resulting ions do not combine with each other) \((1\,eV = 1.6 \times {10^{ - 19}}J)\)

Answers Choices:

70

100

170

270

Questions 47 of 50

Question:What is the free energy change \(\Delta G\) when \(1.0\,mole\) of water at \({100^o}C\) and \(1\,atm\) pressure is converted into steam at \({100^o}C\) and \(1\,atm\) pressure

Answers Choices:

\(540\,cal\)

\( - 9800\,cal\)

\(9800\,cal\)

\(0\,cal\)

Questions 48 of 50

Question:\(\Delta {G^o}\) for the reaction \(X + Y\) \( \leftrightarrow \) Z is -4.606 kcal . The value of equilibrium constant of the reaction at \({227^o}C\) is \((R = 2.0\,cal.\,mo{l^{ - 1}}{K^{ - 1}})\)

Answers Choices:

100

10

2

0.01

Questions 49 of 50

Question:The free energy for a reaction having \(\Delta H = 31400\,ca;\). \(\Delta S = 32\,cal\,{K^{ - 1}}\,mo{l^{ - 1}}\) at \({1000^o}C\) is

Answers Choices:

9336 cal

7386 cal

1936 cal

+ 9336 cal

Questions 50 of 50

Question:The \(\Delta H\) and \(\Delta S\) for a reaction at one atmospheric pressure are +30.558 kJ and \(0.066\,kJ{k^{ - 1}}\) respectively. The temperature at which the free energy change will be zero and below of this temperature the nature of reaction would be

Answers Choices:

483 K, spontaneous

443 K, non spontaneous

442 K, spontaneous

443 K, spontaneous

463 K, spontaneous