EASY

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What will be the value of $Δ G$ for ice at $8^{o} C$ temperature?

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Important Questions on Chemical Thermodynamics

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

For a spontaneous process,

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

At what temperature, a chemical reaction will have following values?

$ΔG = 4 kJ, ΔH = - 60 kJ, ΔS = - 160 J$

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Consider the following reactions occurring in an automobile, $C_{8} H_{18} (g) + \frac{25}{2} O_{2} (g) \to 8 {CO}_{2} (g) + 9 H_{2} O (g)$

The sign of $ΔH, ΔS$ and $ΔG$ respectively would be,

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Which reaction either endothermic or exothermic characteristics has the greater chance of occuring spontaneously?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

For a reaction,

Δ H = 9.08 k J m o l^{- 1}

and

Δ S = 35.7 J K^{- 1} m o l^{- 1}

.

Which of the following statements is correct regarding the reaction?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In a reaction,

ΔH

and

ΔS

, both are more than zero. In which of the following cases would the reaction be spontaneous?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In conversion of limestone to lime,

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

the values of

∆ H ° a n d ∆ S °

are +179.1 KJ/mol ,160.2J/K respectively at 298 K and 1 bar. Assuming that

∆ H ° a n d ∆ S °

do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Assertion: Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason: Entropy of the system increases with increase in temperature.

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In which of the following reactions, standard reaction entropy change

({ΔS}^{o})

is positive and standard Gibb's energy change

({ΔG}^{o})

decreases sharply with increasing temperature?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

For a reaction

Δ H = - 9.08 k J m o l^{- 1}

and

Δ S = 35.7 J K^{- 1} m o l^{- 1}

Which of the following statements is correct for the reaction?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

If a process is both endothermic and spontaneous , then :

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Considering entropy

(∆ S)

as a thermodynamic parameter, the criterion for the spontaneity of any process is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Which of the following processes is a non-spontaneous process?

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In an irreversible process taking place at constant

T

and

p

and in which only pressure-volume work is being done, the change in Gibbs free energy (

d G

) and change in entropy (

d S

), satisfy the criteria.

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In the process of ice melting at

- 15 ° C

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

In an irreversible process taking place at constant T and P and in which only pressure volume work is being done, the change in Gibb's free energy

(∆ G)

and change in entropy

(∆ S)

, satisfy the criteria

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

A change that can occur on its own is called

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

The factor of

Δ G

values is important in metallurgy. The

Δ G

values for the following reactions at

800^{o} C

are given as:

S_{2} (g) + 2 O_{2} (g) \to 2 S O_{2} (g); Δ G = - 544 k J

2 Z n (s) + S_{2} (g) \to 2 Z n S (s); Δ G = - 293 k J

2 Z n (s) + O_{2} (g) \to 2 Z n O (s); Δ G = - 480 k J

The

Δ G

for the reaction,

2 Z n S (g) + 3 O_{2} (g) \to 2 Z n O (g) + 2 S O_{2} (g)

; will be

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Cotyledons are also called-

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Spontaneity

Identify the correct statement regarding a spontaneous process :

What will be the value of ΔG for ice at 8oC temperature?

Important Questions on Chemical Thermodynamics

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What will be the value of $Δ G$ for ice at $8^{o} C$ temperature?