Thermochemistry and Thermodynamics Test 5

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:If a refrigerator's door is opened, then we get

Answers Choices:

Room heated

Room cooled

More amount of heat is passed out

No effect on room

Questions 2 of 50

Question:The cooling in refrigerator is due to

Answers Choices:

Reaction of the refrigerator gas

Expansion of ice

The expansion of the gas in the refrigerator

The work of the compressor

Questions 3 of 50

Question:The first law of thermodynamics is only

Answers Choices:

The law of conservation of energy

The law of conservation of mass

The law of conservation of momentum

Both 1 and 2

Questions 4 of 50

Question:A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If \(\Delta H\) is the enthalpy change and \(\Delta E\) is the change in internal energy, then

Answers Choices:

\(\Delta H > \Delta E\)

\(\Delta H < \Delta E\)

\(\Delta H = \Delta E\)

The relationship depends on the capacity of the vessel

Questions 5 of 50

Question:During an isothermal expansion of an ideal gas its

Answers Choices:

Internal energy increases

Enthalpy decreases

Enthalpy remains unaffected

Enthalpy reduces to zero

Questions 6 of 50

Question:The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at \({25^o}C\) is

Answers Choices:

\(2.303 \times 298 \times 0.082\,\log \,2\)

\(298 \times {10^7} \times 8.31 \times 2.303\,\log \,2\)

\(2.303 \times 298 \times 0.082\,\log \,0.5\)

\(8.31 \times {10^7} \times 298 - 2.303\,\log \,0.5\)

Questions 7 of 50

Question:For the reaction \(C{H_3}COOH(l) + 2{O_2}(g)\) \( \leftrightarrow \) \(2C{O_2}(g) + 2{H_2}O(l)\) at \({25^o}C\) and 1 atm. pressure, \(\Delta H = - 874\,kJ.\) Then the change in internal energy \((\Delta E)\) is

Answers Choices:

874 kJ

871.53 kJ

876.47 kJ

+ 874 kJ

Questions 8 of 50

Question:In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true

Answers Choices:

\(\Delta E = W = Q = 0\)

\(\Delta E \ne 0,\,Q = W = 0\)

\(\Delta E = W \ne 0,\,Q = 0\)

\(\Delta E = Q \ne 0,\,W = 0\)

Questions 9 of 50

Question:One mole of an ideal gas is allowed to expand reversibly and adibatically from a temperature of \({27^o}C\). If the work done during the process is \(3\,kJ\), then final temperature of the gas is \(({C_V} = 20\,J/K)\)

Answers Choices:

100 K

150 K

195 K

255 K

Questions 10 of 50

Question:Which of the following is correct regarding the internal energy of a substance

Answers Choices:

It is a state function

It increases with increase in temperature

It can be calculated by experiment

It remains unaffected with change in temperature

Questions 11 of 50

Question:Which one of the following process is non-spontaneous

Answers Choices:

Dissolution of \(CuS{O_4}\) in water

Reaction between \({H_2}\) and \({O_2}\) to form water

Water flowing down hill

Flow of electric current from low potential to high potential

Questions 12 of 50

Question:Which of the following is zero during adiabatic expansion of the gas

Answers Choices:

\(\Delta T\)

\(\Delta S\)

\(\Delta E\)

None of these

Questions 13 of 50

Question:Which of the following is true for the reaction \({H_2}O(l)\)\( \leftrightarrow \)\({H_2}O(g)\) at \({100^o}C\) and 1 atmosphere

Answers Choices:

\(\Delta E = 0\)

\(\Delta H = 0\)

\(\Delta H = \Delta E\)

\(\Delta H = T\Delta S\)

Questions 14 of 50

Question: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

Answers Choices:

\(111.9\,J\,mo{l^{ - 1}}{K^{ - 1}}\)

\(37.3\,J\,mo{l^{ - 1}}\,{K^{ - 1}}\)

\(100\,J\,mo{l^{ - 1}}{K^{ - 1}}\)

\(74.6\,J\,mo{l^{ - 1}}{K^{ - 1}}\)

Questions 15 of 50

Question:Which of the following conditions will always lead to a non-spontaneous change

Answers Choices:

Positive \(\Delta H\) and positive \(\Delta S\)

Negative \(\Delta H\) and negative \(\Delta S\)

Positive \(\Delta H\) and negative \(\Delta S\)

Negative \(\Delta H\) and positive \(\Delta S\)

Questions 16 of 50

Question: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

Answers Choices:

736 K

1050 K

\(1150\,K\)

\({1150^o}C\)

Questions 17 of 50

Question: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

Answers Choices:

+ 590 joules

334 joules

+ 334 joules

590 joules

Questions 18 of 50

Question:Highest entropy is in

Answers Choices:

Hydrogen

Water

Graphite

Mercury

Questions 19 of 50

Question:In which of the following neutralisation reactions, the heat of neutralisation will be highest

Answers Choices:

\(N{H_4}OH\) and \(C{H_3}COOH\)

\(N{H_4}OH\) and \(HCl\)

\(NaOH\) and \(C{H_3}COOH\)

\(NaOH\) and \(HCl\)

Questions 20 of 50

Question:If \(S + {O_2} \to S{O_2};\,(\Delta H = - 298.2)\) , \(S{O_2} + \frac{1}{2}{O_2} \to S{O_3};\,(\Delta H = - 98.2)\), \(S{O_3} + {H_2}O \to {H_2}S{O_4};\,(\Delta H = - 130.2)\) , \({H_2} + \frac{1}{2}{O_2} \to {H_2}O;\,(\Delta H = - 287.3)\), then the enthalpy of formation of \({H_2}S{O_4}\) at 298K will be

Answers Choices:

\( - 433.7\,kJ\)

\( - 650.3\,kJ\)

\( + 320.5\,kJ\)

\( - 813.9\,kJ\)

Questions 21 of 50

Question:Correct relationship between heat of fusion \((\Delta {H_{fus}})\), heat of vaporization \((\Delta {H_{vap}})\) and heat of sublimation \((\Delta {H_{sub}})\) is

Answers Choices:

\(\Delta {H_{fus}} = \Delta {H_{vap}} + \Delta {H_{sub}}\)

\(\Delta {H_{vap}} = \Delta {H_{fus}} + \Delta {H_{sub}}\)

\(\Delta {H_{sub}} = \Delta {H_{vap}} + \Delta {H_{fus}}\)

\(\Delta {H_{sub}} = \Delta {H_{vap}} - \Delta {H_{fus}}\)

Questions 22 of 50

Question:Which of the following is an example of endothermic reaction

Answers Choices:

\({C_2}{H_2} + 2{H_2} \to {C_2}{H_6};\,\,\Delta E = - 314.0\,kJ\)

\(C + {O_2} \to C{O_2};\,\,\Delta E = - 393.5\,kJ\)

\({N_2} + {O_2} \to 2NO;\,\,\Delta E - 180.5\,kJ\)

\(2{H_2} + {O_2} \to 2{H_2}O;\,\,\Delta E + 571.8\,kJ\)

Questions 23 of 50

Question:The standard molar heat of formation of ethane, \(C{O_2}\) and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be

Answers Choices:

372 kcal

162 kcal

240 kcal

183.5 kcal

Questions 24 of 50

Question:Which of the following reaction is endothermic

Answers Choices:

\(CaC{O_3} \to CaO + C{O_2}\)

\(Fe + S \to FeS\)

\(NaOH + HCl \to NaCl + {H_2}O\)

\(C{H_4} + 2{O_2} \to C{O_2} + 2{H_2}O\)

Questions 25 of 50

Question:The lowest value of heat of neutralization is obtained for

Answers Choices:

\(HCl + NaOH\)

\(C{H_3}COOH + N{H_4}OH\)

\(N{H_4}OH + HCl\)

\(NaOH + C{H_3}COOH\)

Questions 26 of 50

Question:Heat of neutralisation for the given reaction \(NaOH + HCl \to NaCl + {H_2}O\) is \(57.1\,kJ\,mo{l^{ - 1}}\). What will be the heat released when \(0.25\,mole\) of \(NaOH\) is titrated against \(0.25\,mole\) of \(HCl\)

Answers Choices:

\(22.5\,kJ\,mo{l^{ - 1}}\)

\(57.1\,kJ\,mo{l^{ - 1}}\)

\(14.3\,kJ\,mo{l^{ - 1}}\)

\(28.6\,kJ\,mo{l^{ - 1}}\)

Questions 27 of 50

Question:In the reaction for the transition of carbon in the diamond form to carbon in the graphite form, \(\Delta H\) is \( - 453.5\,cal\). This points out that

Answers Choices:

Graphite is chemically different from diamond

Graphite is as stable as diamond

Graphite is more stable than diamond

Diamond is more stable than graphite

Questions 28 of 50

Question:In the combustion of hydrocarbons, \(\Delta H\) is

Answers Choices:

Negative

Zero

Positive

Undeterminate

Questions 29 of 50

Question:If enthalpies of formation of \({C_2}{H_4}(g),\,C{O_2}(g)\) and \({H_2}O(l)\) at \({25^o}C\) and \(1\,atm\) pressure be 52, -394 and \( - 286\,kJ\,mo{l^{ - 1}}\) respectively, the enthalpy of combustion of \({C_2}{H_4}(g)\) will be

Answers Choices:

\( + 1412\,kJ\,mo{l^{ - 1}}\)

\( - 1412\,kJ\,mo{l^{ - 1}}\)

\( + 141.2\,kJ\,mo{l^{ - 1}}\)

\( - 141.2\,kJ\,mo{l^{ - 1}}\)

Questions 30 of 50

Question:Carbon and carbon monoxide burn in oxygen to form carbon dioxide according to the following reactions \(C + {O_2} \to C{O_2};\,\Delta H = - 394\,kJ\,mo{l^{ - 1}}\) , \(2CO + {O_2} \to 2C{O_2};\,\Delta H = - 569\,kJ\,mo{l^{ - 1}}\) . The heat of formation of \(1\,mol\)of carbon monoxide is thus

Answers Choices:

\( - 219.0\,kJ\,mo{l^{ - 1}}\)

\( - 109.5\,kJ\,mo{l^{ - 1}}\)

\( - 175.0\,kJ\,mo{l^{ - 1}}\)

\( - 87.5\,kJ\,mo{l^{ - 1}}\)

Questions 31 of 50

Question:Calculate the standard heat of formation of carbon disulphide \((l)\), given that the standard heat of combustion of carbon \((s)\), sulphur \((s)\) and carbon disulphide \((l)\) are \( - 393.3,\, - 293.72\) and \( - 1108.76\,kJ\,mo{l^{ - 1}}\) respectively

Answers Choices:

\( - 128.02\,kJ\,mo{l^{ - 1}}\)

\( + 12.802\,kJ\,mo{l^{ - 1}}\)

\( + 128.02\,kJ\,mo{l^{ - 1}}\)

\( - 12.802\,kJ\,mo{l^{ - 1}}\)

Questions 32 of 50

Question:Fermentation is a reaction called

Answers Choices:

Endothermic

Exothermic

Isotemperature

Reversible

Questions 33 of 50

Question:When \(50\,c{m^3}\) of a strong acid is added to \(50\,c{m^3}\) of an alkali, the temperature rises by \({5^o}C\). If \(250\,c{m^3}\) of each liquid are mixed, the temperature rise would be

Answers Choices:

\({5^o}C\)

\({10^o}C\)

\({25^o}C\)

\({20^o}C\)

Questions 34 of 50

Question:\({H_2}(g) + \frac{1}{2}{O_2}(g)\,\, \to \,\,{H_2}O(l)\); , \(\Delta H\) at 298 K = -285.8 kJ . The molar enthalpy of vaporisation of water at 1 atm and \({25^o}C\) is 44 kJ. The standard enthalpy of formation of 1 mole of water vapour at \({25^o}C\) is

Answers Choices:

241.8 kJ

241.8 kJ

329.8 kJ

329.8 kJ

Questions 35 of 50

Question:When 4 g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat is evolved. What is the enthalpy of formation of ferric oxide (At. Wt. of Fe = 56)

Answers Choices:

81.98 kJ

819.8 kJ

40.99 kJ

+ 819.8 kJ

Questions 36 of 50

Question:\(C(s) + {O_2}(g)\, \to \,C{O_2};\,\,\,\,\Delta H = - 94\,kcal\), \(CO(g) + \frac{1}{2}{O_2}(g)\, \to \,C{O_2};\,\,\,\Delta H = 135.2\,kcal\). Then heat of formation of \(CO(g)\) is

Answers Choices:

26.4 kcal

41.2 kcal

26.4 kcal

229.2 kcal

Questions 37 of 50

Question:The heat of neutralization of \(HCl\) and \(NaOH\) is

Answers Choices:

Zero

57.3 kJ

+ 57.3 kJ

None of these

Questions 38 of 50

Question:The following thermochemical reactions are given \(M + \frac{1}{2}{O_2}\,\, \to \,\,MO + 351.4\,kJ\), \(X + \frac{1}{2}{O_2}\,\, \to \,\,XO + 90.8\,kJ\). It follows that the heat of reaction for the following process \(M + XO\) \( \leftrightarrow \) \(MO + X\) is given by

Answers Choices:

422.2 kJ

268.7 kJ

442.2 kJ

260.6 kJ

Questions 39 of 50

Question:The heat evolved in the combustion of methane is given by the following equations: \(C{H_4}(g) + 2{O_2}(g)\, \to \,C{O_2}(g) + {H_2}O(l);\)\(\Delta H = - 890.3\,kJ\). How many grams of methane would be required to produce 445.15 kJ of heat of combustion

Answers Choices:

4 g

8 g

12 g

16 g

Questions 40 of 50

Question:Heats of combustion \((\Delta {H^o})\) for \(C(s),\,{H_2}(g)\) and \(C{H_4}(g)\) are \( - 94,\, - 68\) and \( - 213\,kcal/mol.\) respectively. The value of \(\Delta {H^o}\) for the reaction, \(C(s) + 2{H_2}(g)\, \to \,C{H_4}(g)\) is

Answers Choices:

85 kcal

111 kcal

17 kcal

170 kcal

Questions 41 of 50

Question:If the value of \(\Delta H\) in a reaction is positive, then the reaction is called

Answers Choices:

Exothermic

Endothermic

Polymorphic

Polytropic

Questions 42 of 50

Question:The heat of combustion of carbon to \(C{O_2}\) is \( - 393.5\,kJ/mol\). The heat released upon formation of 35.2 g of \(C{O_2}\) from carbon and oxygen gas is

Answers Choices:

\( + \,315\,kJ\)

\( - \,31.5\,kJ\)

\( - 315\,kJ\)

\( + 31.5\,kJ\)

Questions 43 of 50

Question:Which of the following equations correctly represents the standard heat of formation \((\Delta H_f^o)\) of methane

Answers Choices:

\(C\)(diamond) \( + 4{H_{(g)}} \to C{H_{4\,(g)}}\)

\(C\) (diamond) \( + 2{H_{2\,(g)}} \to C{H_{4\,(g)}}\)

\(C\) (graphite) \( + 2{H_{2\,(g)}} \to C{H_{4\,(g)}}\)

\(C\) (graphite) \( + 4{H_{(g)}} \to C{H_{4\,(g)\,}}\)

Questions 44 of 50

Question:If the heat of formation of \(C{O_2}\) is\( - 393\,kJ\). The amount of heat evolved in the formation of 0.156 kg of \(C{O_2}\) is

Answers Choices:

\( - 1357.9\,\,kJ\)

\( - 1275.9\,kJ\)

\( - 1572.0\,kJ\)

\( - 1165.5\,kJ\)

Questions 45 of 50

Question:Given that \(C(g) + 4H(g)\, \to \,C{H_4}(g);\,\Delta H = - 166\,kJ\). The bond energy \(C - H\) will be

Answers Choices:

208 kJ/mole

41.6 kJ/mole

832 kJ/mole

None of these

Questions 46 of 50

Question:The \(H - H\) bond energy is 430 kJ \(mol\) and \(Cl - Cl\) bond energy is \(240\,kJ\,mo{l^{ - 1}}.\,\,\Delta H\) for \(HCl\) is \( - 90\,kJ\). The \(H - Cl\) bond energy is about

Answers Choices:

\(180\,kJ\,mo{l^{ - 1}}\)

\(360\,kJ\,mo{l^{ - 1}}\)

\(213\,kJ\,mo{l^{ - 1}}\)

\(425\,kJ\,mo{l^{ - 1}}\)

Questions 47 of 50

Question:If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of \(C - C\) bond is

Answers Choices:

80 calories

40 calories

60 calories

120 calories

Questions 48 of 50

Question:The standard enthalpy of the decomposition of \({N_2}{O_4}\) to \(N{O_2}\) is 58.04 kJ and standard entropy of this reaction is 176.7 J/K. The standard free energy change for this reaction at \({25^o}C\) is

Answers Choices:

539 kJ

539 kJ

5.39 kJ

5.39 kJ

Questions 49 of 50

Question:Spontaneity of a chemical reaction is decided by the negative change in

Answers Choices:

Internal energy

Enthalpy

Entropy

Free energy

Questions 50 of 50

Question:For a reaction at \({25^o}C\) enthalpy change and entropy changes are \( - 11.7 \times {10^3}J\,mo{l^{ - 1}}\) and \( - 105\,J\,mo{l^{ - 1}}{K^{ - 1}}\) respectively. What is the Gibbs free energy

Answers Choices:

15.05 kJ

19.59 kJ

2.55 kJ

22.55 kJ