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First Law of Thermodynamics

1st law of Th...

Question

1st law of Thermodynamics can explain

A

Spontaneity of process

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B

Perpetual machine of 2nd kind

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C

Perpetual machine of 3rd kind

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D

The total energy of an isolated system remains constant

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Solution

The correct option is C The total energy of an isolated system remains constant
The first law of thermodynamics states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed.
E=Q+W

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Q. Ionization energy is defined as 'the energy required for removing the most loosely bound electron from an isolated gaseous atom or ion'. Identify element A.

Molar ionization energy for element 'A'	$1^{s t}$	$2^{n d}$	$3^{r d}$	$4^{t h}$	$5^{t h}$	$6^{t h}$
(kJ/mol)	1086.5	2352.6	4620.5	6222.7	37831	47277

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