Related InterviewSolutions

• For the percipitation reaction of `Ag^(o+)` ions with `NaCI`, which of the following statements is true?A. `DeltaH` is zero for the reactionB. `DeltaG` is zero for the reactionC. `DeltaG` is negative for the negativeD. `DeltaG` should be equal to `DeltaH`
• Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. Reason (R ) : For photochemical reaction, `DeltaG` is negative.A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false.
• Which statement (s) is/are true? 1. `S^(Theta)` values for all elements in their states are positive. 2. `S^(Theta)` values for all aqueous ions are positive. 3. `DeltaS^(Theta)` values for all spontaneous reactions are positive.A. 1 onlyB. 1 and 2 onlyC. 2 and 3 onlyD. all of these
• The enthalpy changes at 298 K in successive breaking of `O-H` bonds of water, are `H_(2)O(g) rarr H(g)+OH(g),DeltaH=498kJ mol^(-1)` `OH(g) rarr H(g)+O(g), DeltaH =428 kJ mol^(-1)` The bond energy of the O-H bond isA. 498 kJ `mol^(-1)`B. 463 kJ `mol^(-1)`C. 428 kJ `mol^(-1)`D. 70 kJ `mol^(-1)`
• Assertion (A): The Joules -Thomon coefficient for an ideal gas is zero. Reason (R ) : There are no intermlecular attactive forces in an ideal gas.A. If both (A) and (R) are correct and (R) is the correct explanation for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct.
• Bond energies can be obtained by using the following relation: `DeltaH (reaction) = sum`Bond energy of bonds, broken in the reactants `-sum` Bond energy fo bonds, formed in the products Bond enegry depends on three factors: a. Greater is the bond length, lesser is the bond enegry. b. Bond energy increases with the bond multiplicity. c. Bond enegry increases with electronegativity difference between the bonding atoms. In `CH_(4)` molecule, which of the following statement is correct about the `C -H` bond enegry?A. All C-H bonds of methane have same energyB. Average of all C-H bond energies is consideredC. Fourth C-H bond requires highest energy to breakD. none of the above
• 3 moles of `CO_(2)` gas expands isothermally against external pressure of 1 bar. Volume increases from 10 L to 30 L respectively. The system is in thermal contact of surroundings at temperature `15^(@)C`. Entropy change in isotehrmal process is: `DeltaS=2.303nR" log "((V_(2))/(V_(1)))`. Q. If `CO_(2)` behaves like an ideal gas, then entropy change of system `(DeltaS_("system"))` will be:A. `+27.4JK^(-1)`B. `9.1JK^(-1)`C. `-27.4JK^(-1)`D. `-9.1JK^(-1)`
• 3 moles of `CO_(2)` gas expands isothermally against external pressure of 1 bar. Volume increases from 10 L to 30 L respectively. The system is in thermal contact of surroundings at temperature `15^(@)C`. Entropy change in isotehrmal process is: `DeltaS=2.303nR" log "((V_(2))/(V_(1)))`. Q. Select the correct relation:A. `DeltaS_("system")gt0,DeltaS_(surr).=0`B. `DeltaS_(surr)lt0,DeltaS_("system")gt0`C. `DeltaS_("system")=0,DeltaS_(surr).=0`D. `DeltaS_(surr)gt0,DeltaS_("system")lt0`
• For an ideal gas Joule-Thomon coefficient is:A. zeroB. positiveC. negativeD. depends on atomicity of gas
• Statement -1 in the following reaction : `C(s)+O_(2)(g)to CO_(2) (g), DeltaH=DeltaU-RT` Statement -2: `DeltaH` Is related to `DeltaU ` by the equation , `DeltaH=Delta+Deltan_(g)RT`A. If both (A) and (R) are correct and (R) is the correct reason for (A).B. If both (A) and (R) are correct but (R) is not the correct explanation for (A).C. If (A) is true but (R) is falseD. If both (A) and (R) are false.