GATE MT concept:enthalpy PYQs & Answers — Page 2

Questions 11–16 of 16. Imported answers require independent review unless marked reviewed.

Topic practice 16 questionsPage 2 of 2

Elements A and B have the same crystal structure. For a dilute solution of B in A, which one of the following is true?

(Given:

– Mixing enthalpy,

– Activity of B and

– Mole fraction of B)

Your answerChoose one option.

, then

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Melting point of Cu is 1358 K and its enthalpy of melting is 13400 J mol

. The value of free energy change (in J mol

) for liquid to solid transformation at 1058 K is: __________ (round off to nearest integer).

Assume:

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The vacancy concentration in a crystal doubles upon increasing the temperature from 27 °C to 127 °C. The enthalpy (in kJ mol

) of vacancy formation is: ______ (round off to 2 decimal places). Given:

J mol

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The condition for getting the binary phase diagram of A-B (shown below) is:

Given:

– Enthalpy of mixing of solid

– Enthalpy of mixing of liquid

Your answerChoose one option.

and

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If liquid copper is cooled to 1353 K, magnitude of the driving force for liquid to transform to solid is ______ J·mol

(round off to one decimal place).

Given, melting temperature and enthalpy of melting of copper are 1356 K and 13 kJ·mol

respectively.

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For the reaction: 4Ag(s, pure) + O

(g) → 2Ag

O(s, pure), the standard enthalpy change,

, and the standard entropy change,

, in the temperature range from 298 K to 500 K. The temperature above which Ag

O decomposes in an atmosphere containing oxygen at a partial pressure

is ______ (in K to one decimal place). Given: Gas constant R = 8.314 J K

mol

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GATE MT concept:enthalpy PYQs