Chemistry-
General
Easy
Question
Assertion: At constant pressure for the change H2O(s)→H2O(g) work done is negative.
Reason: During phase transition work done is always negative.
- If both Assertion and Reason are true and the Reason is correct explanation of the Asser- tion.
- If both Assertion and Reason are true but Rea- son is not correct explanation of the Asser- tion.
- If Assertion is true but the Reason is false.
- If Assertion & Reason both are false
The correct answer is: If Assertion is true but the Reason is false.
Related Questions to study
chemistry-
In view of the signs of DG° or the following reactions:
PbO2 +Pb→2PbO,DrG°<0
SnO2 +Sn→2SnO,DrG°>0, which oxidation states are more characteristic for lead and tin?
In view of the signs of DG° or the following reactions:
PbO2 +Pb→2PbO,DrG°<0
SnO2 +Sn→2SnO,DrG°>0, which oxidation states are more characteristic for lead and tin?
chemistry-General
chemistry-
Considerthereaction:4NO2(g) O2(g) →2N2O5(g) ,DH=–111kJ IfN2O5(s)isformedinsteadofN2O5(g)intheabove reaction,theDHvaluewillbe:(given,DHofsublimationfor N2O5is54kJmol )</span
Considerthereaction:4NO2(g) O2(g) →2N2O5(g) ,DH=–111kJ IfN2O5(s)isformedinsteadofN2O5(g)intheabove reaction,theDHvaluewillbe:(given,DHofsublimationfor N2O5is54kJmol )</span
chemistry-General
chemistry-
Thevalueofenthalpychange(DH)forthe reactionC2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) at 27°Cis–1366.5kJmol–1.The valueofinter- nalenergychangefortheabovereactionat this temperaturewillbe-
Thevalueofenthalpychange(DH)forthe reactionC2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) at 27°Cis–1366.5kJmol–1.The valueofinter- nalenergychangefortheabovereactionat this temperaturewillbe-
chemistry-General
chemistry-
Fromthethermochemicalreactions,C(graphite)+½O2 →CO;DH=–110.5KJ CO+1/2O2 →CO2;DH=–83.2KJ Theheatofreactionof C(graphite)+O2 →CO2is-
Fromthethermochemicalreactions,C(graphite)+½O2 →CO;DH=–110.5KJ CO+1/2O2 →CO2;DH=–83.2KJ Theheatofreactionof C(graphite)+O2 →CO2is-
chemistry-General
chemistry-
TheDH° for CO2(g) ,CO(g) and H2O(g) are –393.5,–110.5and–241.8Kjmol–1respectively the standard enthalpychange (in KJ) for the reactionCO2(g)+H2(g)→CO(g)+H2O(g)is-
TheDH° for CO2(g) ,CO(g) and H2O(g) are –393.5,–110.5and–241.8Kjmol–1respectively the standard enthalpychange (in KJ) for the reactionCO2(g)+H2(g)→CO(g)+H2O(g)is-
chemistry-General
chemistry-
Which of the followingequationsrespresents standardheatofformationofCH4 ?
Which of the followingequationsrespresents standardheatofformationofCH4 ?
chemistry-General
chemistry-
2molesof COaremixedwith 1moleofO2ina containerof1l.Theycompletelytoform2moles ofCO2.Ifthe pressurein the vesselchanges from70atmto40atm,whatwill bethevalue of DU in kJat500K(The gasesdeviateappreciably from idealbehaviour.) 2CO+O2→2CO2;DH=-560kJ/mol, 1Latm=0.1kJ For theprocessH2O(l)(1 bar,373K)→H2O(g) (1bar,373K),thecorrect setofthermodynamic parametersis-
2molesof COaremixedwith 1moleofO2ina containerof1l.Theycompletelytoform2moles ofCO2.Ifthe pressurein the vesselchanges from70atmto40atm,whatwill bethevalue of DU in kJat500K(The gasesdeviateappreciably from idealbehaviour.) 2CO+O2→2CO2;DH=-560kJ/mol, 1Latm=0.1kJ For theprocessH2O(l)(1 bar,373K)→H2O(g) (1bar,373K),thecorrect setofthermodynamic parametersis-
chemistry-General
chemistry-
The conversion A to B is carried out by the following path:
Given: DS(A→C) =50e.u.,DS(C→D) =30 e.u., DS(B→D) =20e.u. Where e.u.is entropy unit then DS(A→B) is
The conversion A to B is carried out by the following path:
Given: DS(A→C) =50e.u.,DS(C→D) =30 e.u., DS(B→D) =20e.u. Where e.u.is entropy unit then DS(A→B) is
chemistry-General
physics-
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are and respectively, then
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are and respectively, then
physics-General
Maths-
When does the current flow through the following circuit ?
When does the current flow through the following circuit ?
Maths-General
Maths-
The following circuit when expressed in symbolic form of logic is :
The following circuit when expressed in symbolic form of logic is :
Maths-General
chemistry-
Onemoleofanon-idealgasundergoesachange ofstate(2.0atm,3.0L,95K)→(4.0atm,5.0L,245 K)with achangein internalenergy,DU=30.0L atm.Thechangeinenthalpy(DH)oftheprocessinLatmis-
Onemoleofanon-idealgasundergoesachange ofstate(2.0atm,3.0L,95K)→(4.0atm,5.0L,245 K)with achangein internalenergy,DU=30.0L atm.Thechangeinenthalpy(DH)oftheprocessinLatmis-
chemistry-General
chemistry-
Inconversion oflime-stonetolime,CaCO3(s)→CaO(s)+CO2(g)thevalues ofDHºandDSºare+179.1kJmol–1and160.2J/Krespectivelyat298Kand1bar.AssumingthatDHºandDSºdonotchange withtemperature,temperatureabovewhich conversionoflimestonetolimewillbespontaneous is-
Inconversion oflime-stonetolime,CaCO3(s)→CaO(s)+CO2(g)thevalues ofDHºandDSºare+179.1kJmol–1and160.2J/Krespectivelyat298Kand1bar.AssumingthatDHºandDSºdonotchange withtemperature,temperatureabovewhich conversionoflimestonetolimewillbespontaneous is-
chemistry-General
chemistry-
Consider the reaction:N2+ 3H2→2NH3carried out at constant temperature and pressure. If DH and DU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?
Consider the reaction:N2+ 3H2→2NH3carried out at constant temperature and pressure. If DH and DU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?
chemistry-General
Physics-
Consider a disc rotating in the horizontal plane with a constant angular speed about its centre . The disc has a shaded region on one side of the diameter and an unshanded region on the other side as shown in the figure. When the disc is in the orientation as shown, two pebbles and are simultaneously projected at an angle towards . The velocity of projection is in the plane and is same for both pebbles with respect to the disc. Assume that i) they land back on the disc before the disc has completed rotation. ii) their range is less than half the disc radius, and (iii) remains constant throughout. Then
Consider a disc rotating in the horizontal plane with a constant angular speed about its centre . The disc has a shaded region on one side of the diameter and an unshanded region on the other side as shown in the figure. When the disc is in the orientation as shown, two pebbles and are simultaneously projected at an angle towards . The velocity of projection is in the plane and is same for both pebbles with respect to the disc. Assume that i) they land back on the disc before the disc has completed rotation. ii) their range is less than half the disc radius, and (iii) remains constant throughout. Then
Physics-General