Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.

Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.
by

1 Answer

Answer :

Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction ... D. If both Assertion & Reason are false.
by

Related questions

Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason (R ) : Entropy of

Description : Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason (R ) : Entropy of

Last Answer : Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous ... . If both Assertion & Reason are false.

For a spontaneous process, free energy (A) Is zero (B) Increases (C) Decreases whereas the entropy increases (D) And entropy both decrease

Description : For a spontaneous process, free energy (A) Is zero (B) Increases (C) Decreases whereas the entropy increases (D) And entropy both decrease

Last Answer : C) Decreases whereas the entropy increases

Assertion: The enthalpy of formation of gaseous oxygen molecules at `298K` and under1 atm is zero. Reason: The entropy of formation of gaseous oxygen

Description : Assertion: The enthalpy of formation of gaseous oxygen molecules at `298K` and under1 atm is zero. Reason: The entropy of formation of gaseous oxygen

Last Answer : Assertion: The enthalpy of formation of gaseous oxygen molecules at `298K` and under1 atm is zero. ... D. If both Assertion & Reason are false.

Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.

Description : Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.

Last Answer : Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of ... False. D. If both Assertion & Reason are false.

Pick out the wrong statement. (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point (B) Entropy of a system decreases with the evolution of heat (C) Change of internal energy is negative for exothermic reactions (D) The eccentric factor for all materials is always more than one

Description : Pick out the wrong statement. (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point (B) Entropy of ... is negative for exothermic reactions (D) The eccentric factor for all materials is always more than one

Last Answer : (D) The eccentric factor for all materials is always more than one

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always (A) Increases (B) Decreases (C) Remain constant (D) Increases to a maximum before decreasing

Description : For a spontaneous natural process at constant temperature and pressure, the free energy of the system always (A) Increases (B) Decreases (C) Remain constant (D) Increases to a maximum before decreasing

Last Answer : : Option A

Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

Description : Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

Last Answer : Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The ... D. If both Assertion & Reason are false.

In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s energy change`(DeltaG^(@))`decreases

Description : In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s energy change`(DeltaG^(@))`decreases

Last Answer : In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s ... (2)O_(2)(g)rarr CO_(2)(g)`

In which of the following reactions, standard reaction entropy change (S°) is positive and standard Gibb’s energy change (G°) decreases sharply with increasing temperature? (1) 2 2 1 1 1 C graphite O (g) CO (g) 2 2 2   (2) 2 1 C graphite O (g) CO(g) 2   (3) 2 2 1 CO(g) O (g) CO (g) 2   (4) 2 1 Mg(s) O (g) MgO(s) 2  

Description : In which of the following reactions, standard reaction entropy change (S°) is positive and standard Gibb's energy change (G°) decreases sharply with increasing temperature? (1) 2 2 1 1 1 C graphite O (g) CO (g) 2 2 2   (2) 2 1 C ... CO(g) O (g) CO (g) 2   (4) 2 1 Mg(s) O (g) MgO(s) 2  

Last Answer : C graphite O (g) CO(g)

Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. Reason (R ) : For photochemical reaction, `DeltaG` is

Description : Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. Reason (R ) : For photochemical reaction, `DeltaG` is

Last Answer : Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. ... False. D. If both Assertion & Reason are false.

Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Description : Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Last Answer : Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always ... D. If both Assertion & Reason are false.

Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy increases.

Description : Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy increases.

Last Answer : Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy ... D. If both Assertion & Reason are false.

__________ decreases during adiabatic throttling of a perfect gas. (A) Entropy (B) Temperature (C) Enthalpy (D) Pressure

Description : __________ decreases during adiabatic throttling of a perfect gas. (A) Entropy (B) Temperature (C) Enthalpy (D) Pressure

Last Answer : (D) Pressure

Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant increases. Reason :- Oxidant gains electron(s)

Description : Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant increases. Reason :- Oxidant gains electron(s)

Last Answer : Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant ... D. If both Assertion & Reason are False.

Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on

Description : Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on

Last Answer : Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of ... D. A is incorrect but R is correct

The enthalpy change for a given reaction at `298 K` is `-x cal mol^(-1)`. If the reaction occurs spontaneously at `298 K`, the entropy change at that

Description : The enthalpy change for a given reaction at `298 K` is `-x cal mol^(-1)`. If the reaction occurs spontaneously at `298 K`, the entropy change at that

Last Answer : The enthalpy change for a given reaction at `298 K` is `-x cal mol^(-1)`. If the reaction occurs ... (-1)` C. Cannot be negative D. Cannot be positive

The enthalpy and entropy change for the reaction, `Br_(2)(l)+Cl_(2)(g)rarr2BrCl(g)` are `30KJmol^(-1)` and `105JK^(-1)mol^(-1)` respectively. The temp

Description : The enthalpy and entropy change for the reaction, `Br_(2)(l)+Cl_(2)(g)rarr2BrCl(g)` are `30KJmol^(-1)` and `105JK^(-1)mol^(-1)` respectively. The temp

Last Answer : The enthalpy and entropy change for the reaction, `Br_(2)(l)+Cl_(2)(g)rarr2BrCl(g)` are `30KJmol^(-1)` and ` ... 285.7 K B. 273 K C. 450 K D. 300 K

If a reaction has an enthalpy of -54.32 kJ/mol and an entropy of -354.2 J/(K*mol), what is the Gibbs free Energy at 54.3(degrees c)?

Description : If a reaction has an enthalpy of -54.32 kJ/mol and an entropy of -354.2 J/(K*mol), what is the Gibbs free Energy at 54.3(degrees c)?

Last Answer : DeltaG = DeltaH - TDeltaS dG = -54.32 kJ/mol - (54'32+273)K(-354.2J/molK) NB Thevtemperature is quoted in Kelvin(K) and the Entropy must be converted to kJ by dividing by '1000'/ Hence dG = ... 115.94 kJ/mol dG = (+)61.61 kJ/mol Since dG is positive, the reaction is NOT thermodynamically feasible.

What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

Description : What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

Last Answer : Ans.The free energy change of a reaction is given by ΔG = ΔH - TΔS For a reaction to be spontaneous, ΔG should be -ve. If both ΔH and ΔS are positive ΔG can be -ve if TΔS>ΔH in magnitude. Thus, entropy ... is low, TΔS should be greater than ΔH (ii) If ΔS is small, T should be so large that TΔS>ΔH.

Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of (A) Solution (B) Vaporisation (C) Formation (D) Sublimation

Description : Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of (A) Solution (B) Vaporisation (C) Formation (D) Sublimation

Last Answer : (B) Vaporisation

The first law of thermodynamics is based on which of the following principles?  a. conservation of mass  b. the enthalpy-entropy relationship  c. action – reaction  d. conservation of energy

Description : The first law of thermodynamics is based on which of the following principles?  a. conservation of mass  b. the enthalpy-entropy relationship  c. action – reaction  d. conservation of energy

Last Answer : conservation of energy

What is the energy absorbed during chemical reaction under constant volume conditions?  A. Entropy  B. Ion exchange  C. Enthalpy  D. Enthalpy of reaction

Description : What is the energy absorbed during chemical reaction under constant volume conditions?  A. Entropy  B. Ion exchange  C. Enthalpy  D. Enthalpy of reaction

Last Answer : Enthalpy

In any chemical reaction, a quantity that decrease to a minimum is: w) free energy x) entropy y) temperature z) enthalpy

Description : In any chemical reaction, a quantity that decrease to a minimum is: w) free energy x) entropy y) temperature z) enthalpy

Last Answer : ANSWER: W -- FREE ENERGY

The reactions with low activation energy are (A) Always spontaneous (B) Slow (C) Fast (D) Non-spontaneous

Description : The reactions with low activation energy are (A) Always spontaneous (B) Slow (C) Fast (D) Non-spontaneous

Last Answer : (C) Fast

Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, `DeltaG^(@)` is negative and the process is spontaneous

Description : Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, `DeltaG^(@)` is negative and the process is spontaneous

Last Answer : Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, ... ^(@)` is negative and the process is spontaneous.

A 47-year-old patient undergoing a complicated laparotomy for bowel obstruction develops a postoperative enterocutaneous fistula. Which of the following statement(s) is/are true concerning parenteral nutritional support in the postoperative period? a. Oral intake can result in severe dehydration, electrolyte abnormalities, and perifistula skin injury b. Total parenteral nutrition increases the spontaneous closure rate of intestinal fistula c. Total parenteral nutrition decreases mortality rate in patients with intestinal fistulas d. The use of TPN better prepares the patient for surgery if surgical intervention proves necessary

Description : A 47-year-old patient undergoing a complicated laparotomy for bowel obstruction develops a postoperative enterocutaneous fistula. Which of the following statement(s) is/are true concerning parenteral ... use of TPN better prepares the patient for surgery if surgical intervention proves necessary

Last Answer : Answer: a, b, d Patients with gastrointestinal-cutaneous fistulas represent the classical indication for TPN. In such patients, oral intake of food almost invariably results in increased ... treated more aggressively surgically after a defined period of nutritional support (unless closure occurs)

In a spontaneous irreversible process the total entropy of the system and surroundings

Description : In a spontaneous irreversible process the total entropy of the system and surroundings

Last Answer : In a spontaneous irreversible process the total entropy of the system and surroundings A. Remains constant B. Increases C. Decreases D. Zero

Pick out the wrong statement. (A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom (B) The heat capacity of solid inorganic substance is exactly equal to the heatcapacity of the substance in the molten state(C) There is an increase in entropy, when a spontaneous change occurs in anisolated system(D) At absolute zero temperature, the heat capacity for many pure crystallinesubstances is zero

Description : Pick out the wrong statement. (A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom (B) The heat capacity of solid inorganic substance is exactly equal to the ... isolated system (D) At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

Last Answer : (C) There is an increase in entropy, when a spontaneous change occurs in an isolated system

For spontaneous changes in an isolated system (S = entropy) (A) ds = 0 (B) ds <0 (C) ds > 0 (D) ds = Constant

Description : For spontaneous changes in an isolated system (S = entropy) (A) ds = 0 (B) ds 0 (D) ds = Constant

Last Answer : (C) ds > 0

Assertion :- Metallic character increases on going down the group Reason :- I.E. decreases on going down the group

Description : Assertion :- Metallic character increases on going down the group Reason :- I.E. decreases on going down the group

Last Answer : Assertion :- Metallic character increases on going down the group Reason :- I.E. decreases on going ... . D. If both Assertion & Reason are false

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system (A) its internal energy (U) decreases and its entropy (S) increases (B) U and S both decreases (C) U decreases but S is constant (D) U is constant but S decreases

Description : A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system (A) its internal energy (U) decreases and its entropy (S) increases (B) U and S both decreases (C) U decreases but S is constant (D) U is constant but S decreases

Last Answer : (B) U and S both decreases

Velocity of a chemical reaction (A) Decreases with increase in temperature (B) Increases with increase of pressure of reactants for all reactions (C) Decreases with increase of reactant concentration (D) None of these

Description : Velocity of a chemical reaction (A) Decreases with increase in temperature (B) Increases with increase of pressure of reactants for all reactions (C) Decreases with increase of reactant concentration (D) None of these

Last Answer : (D) None of these

The total change in the enthalpy of a system is independent of the (A) Number of intermediate chemical reactions involved (B) Pressure and temperature (C) State of combination and aggregation in the beginning and at the end of the reaction (D) None of these

Description : The total change in the enthalpy of a system is independent of the (A) Number of intermediate chemical reactions involved (B) Pressure and temperature (C) State of combination and aggregation in the beginning and at the end of the reaction (D) None of these

Last Answer : (A) Number of intermediate chemical reactions involved

Spontaneous change is one in there is: (1) A lowering of entropy (2) A lowering of free energy (3) Increase in free energy (4) An increase in Internal energy

Description : Spontaneous change is one in there is: (1) A lowering of entropy (2) A lowering of free energy (3) Increase in free energy (4) An increase in Internal energy

Last Answer : (2) A lowering of free energy Explanation: Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.

A change in state involving a decrease in entropy can be spontaneous, only if (A) It is exothermic (B) It is isenthalpic (C) It takes place isothermally (D) It takes place at constant volume

Description : A change in state involving a decrease in entropy can be spontaneous, only if (A) It is exothermic (B) It is isenthalpic (C) It takes place isothermally (D) It takes place at constant volume

Last Answer : (A) It is exothermic

Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative

Description : Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative

Last Answer : (B) An isometric process is a constant pressure process

Spontaneous change is one in there is: (1) A lowering of entropy (2) A lowering of free energy (3) Increase in free energy (4) An increase in Internal energy

Description : Spontaneous change is one in there is: (1) A lowering of entropy (2) A lowering of free energy (3) Increase in free energy (4) An increase in Internal energy

Last Answer : A lowering of free energy

Assertion :- Absolute value of enthalpy can not be determined. Reason :- Enthalpy is defined as H = E + PV, and value of internal energy can not be de

Description : Assertion :- Absolute value of enthalpy can not be determined. Reason :- Enthalpy is defined as H = E + PV, and value of internal energy can not be de

Last Answer : Assertion :- Absolute value of enthalpy can not be determined. Reason :- Enthalpy is defined as H = ... . D. If both Assertion & Reason are false.

Assertion :- Water in liquid state is more stable than ice at room temperature. Reason :- Water in liquid from has higher entropy than ice.

Description : Assertion :- Water in liquid state is more stable than ice at room temperature. Reason :- Water in liquid from has higher entropy than ice.

Last Answer : Assertion :- Water in liquid state is more stable than ice at room temperature. Reason :- Water in ... . D. If both Assertion & Reason are false.

For an ideal gas, the enthalpy (A) Increases with rise in pressure (B) Decreases with rise in pressure (C) Is independent of pressure (D) Is a path function

Description : For an ideal gas, the enthalpy (A) Increases with rise in pressure (B) Decreases with rise in pressure (C) Is independent of pressure (D) Is a path function

Last Answer : (C) Is independent of pressure

When a salt dissolves in water (a) Entropy decreases (b) Entropy increases (c) Free energy increases (d) Heat is liberated

Description : When a salt dissolves in water (a) Entropy decreases (b) Entropy increases (c) Free energy increases (d) Heat is liberated

Last Answer : Ans:(b)

When ice cubes are made, the entropy of water – (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Description : When ice cubes are made, the entropy of water – (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Last Answer : (2) decreases Explanation: When water is frozen into ice, the temperature drops below 0°C. Since the entropy of the solid is less than that of the liquid, the entropy of the water (the system ... decrease is found by dividing the heat of fusion of ice by the temperature for the reversible pathway.

Pick out the wrong statement. (A) A refrigeration cycle violates the second law of thermodynamics (B) Refrigeration cycle is normally represented by a temperature vs. entropy plot (C) In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases (D) One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

Description : Pick out the wrong statement. (A) A refrigeration cycle violates the second law of thermodynamics (B) Refrigeration cycle is normally represented by a temperature vs. entropy plot (C) In a refrigerator, ... (D) One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

Last Answer : (A) A refrigeration cycle violates the second law of thermodynamics

When liquid water is converted to steam at 100˚C, the entropy of water  a. increases  b. decreases  c. remains the same  d. none of the above

Description : When liquid water is converted to steam at 100˚C, the entropy of water  a. increases  b. decreases  c. remains the same  d. none of the above

Last Answer : increases

The entropy __________ in an irreversible cyclic process.  A. remains constant  B. decreases  C. increases

Description : The entropy __________ in an irreversible cyclic process.  A. remains constant  B. decreases  C. increases

Last Answer : Answer: C

When ice cubes are made, the entropy of water (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Description : When ice cubes are made, the entropy of water (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Last Answer : decreases

_____ is the amount of uncertainty in a system of symbols A. Bandwidth B. Enthalpy C. Entropy D. Quantum

Description : _____ is the amount of uncertainty in a system of symbols A. Bandwidth B. Enthalpy C. Entropy D. Quantum

Last Answer : C. Entropy

Pick out the correct statement. (A) Entropy and enthalpy are path functions (B) In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged (C) All the natural processes are reversible in nature (D) Work is a state function

Description : Pick out the correct statement. (A) Entropy and enthalpy are path functions (B) In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged (C) All the natural processes are reversible in nature (D) Work is a state function

Last Answer : (C) All the natural processes are reversible in nature

For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot? (A) Temperature - entropy (B) Temperature - pressure (C) Enthalpy - entropy

Description : For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot? (A) Temperature - entropy (B) Temperature - pressure (C) Enthalpy - entropy

Last Answer : (A) Temperature - entropy