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Statement -1 . Entropy of all element...

Statement -1 . Entropy of all elements is zero at 0K.
Statement -2. Standard entropy of all elements is greater than zero.

A

Statement -1 is True, Statement-2 is True, Statement-2 is a correct explanation of Statement-1

B

Statement-1 is True Statement-2 is True, Statement-2 is NOT a correct explanation for Statement -1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is False

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the two statements about entropy, we will analyze each statement step by step. ### Step 1: Analyze Statement 1 **Statement 1:** "Entropy of all elements is zero at 0K." - **Explanation:** The third law of thermodynamics states that the entropy of a perfect crystalline substance approaches zero as the temperature approaches absolute zero (0 K). However, this applies specifically to perfect crystalline solids. Not all elements are in a crystalline state at 0 K, and thus, the statement is too broad. Therefore, this statement is **incorrect**. ### Step 2: Analyze Statement 2 **Statement 2:** "Standard entropy of all elements is greater than zero." - **Explanation:** Standard entropy refers to the entropy of a substance at a standard state (1 bar pressure and a specified temperature, usually 298 K). While many substances have positive standard entropies, it is not universally true for all elements, particularly those in their most stable forms at low temperatures. For example, some elements can have a standard entropy of zero at absolute zero, but this does not mean they are greater than zero at all temperatures. Therefore, this statement is also **incorrect**. ### Conclusion Both statements are incorrect. Therefore, the correct answer is that both Statement 1 and Statement 2 are false. ### Final Answer Both Statement 1 and Statement 2 are false. ---
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Knowledge Check

  • Statement-1 : Entropy of all elements is zero at zero Kelvin. Statement-2 : Standard entropy of all elements is greater than zero. Statement-3 : Entropy of all elements and compounds decreases with decrease of temperature and becomes zero at absolute zero temperature.

    A
    F F F
    B
    T T T
    C
    T F F
    D
    F T F

  • The enthalpies of all elements in their standard state are

    A
    Unity
    B
    Zero
    C
    `lt 0`
    D
    Different for each element

  • The enthalpies of all elements in their standard states are

    A
    unity
    B
    zero
    C
    `lt 0`
    D
    different for each element.