EASY
11th CBSE
IMPORTANT
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In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system
(a) will be negative
(b) will be negative
(c)will be positive
(d) will be positive

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Important Questions on Thermodynamics
MEDIUM
11th CBSE
IMPORTANT
The spontaneity means, having the potential to proceed without the assistance of external agency. The processes which occur spontaneously are

MEDIUM
11th CBSE
IMPORTANT
For an ideal gas, the work of reversible expansion under isothermal condition can be calculated by using the expression. A sample containing mol of an ideal gas is expanded isothermally and reversibly to ten times of its original volume, in two separate experiments. The expansion is carried out at and at respectively. Choose the correct option.

EASY
11th CBSE
IMPORTANT
Consider the following reaction between zinc and oxygen and choose the correct options out of the options given below :
.

MEDIUM
11th CBSE
IMPORTANT

EASY
11th CBSE
IMPORTANT

MEDIUM
11th CBSE
IMPORTANT
Standard molar enthalpy of formation, is just a special case of enthalpy of reaction, . Is the for the following reaction same as ? Give reason for your answer.
.

EASY
11th CBSE
IMPORTANT
The value of for is . Calculate the enthalpy change for the following reaction :

EASY
11th CBSE
IMPORTANT
