Home
Class 12
PHYSICS
Statement-1: Specific heat capacities of...

Statement-1: Specific heat capacities of all substance approach zero as `T to O`
Statement-2: Molecular motion ceases at very low temperature.

A

a. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1

B

b. Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1

C

c. Statement-1 is true, statement-2 is false

D

d. Statement-1 is false, statement-2 is true

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements given in the question, we will break down each statement and assess their validity step by step. ### Step 1: Analyze Statement-1 **Statement-1:** "Specific heat capacities of all substances approach zero as T tends to 0." - **Explanation:** The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius. As the temperature approaches absolute zero (0 Kelvin), the molecular motion of the particles in a substance decreases significantly. At absolute zero, the particles are in their lowest energy state, and thus, the amount of heat required to change their temperature becomes negligible. Therefore, the specific heat capacity approaches zero. ### Step 2: Analyze Statement-2 **Statement-2:** "Molecular motion ceases at very low temperature." - **Explanation:** At very low temperatures, the kinetic energy of the molecules decreases, leading to reduced molecular motion. According to the third law of thermodynamics, as the temperature approaches absolute zero, the entropy of a perfect crystal approaches zero, which implies that molecular motion effectively ceases. Thus, this statement is also true. ### Step 3: Conclusion Both statements are true. Furthermore, Statement-2 provides a valid explanation for Statement-1. The decrease in molecular motion at low temperatures leads to a decrease in specific heat capacity as the temperature approaches zero. ### Final Answer Both Statement-1 and Statement-2 are correct, and Statement-2 is the correct explanation for Statement-1. ---
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-E) Match the columns|3 Videos

  • THERMAL PROPERTIES OF MATTER

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-E) Integer Answer Type Questions|3 Videos

  • THERMAL PROPERTIES OF MATTER

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-D) Linked Comprehension Type Questions|9 Videos

  • TEST2

    AAKASH INSTITUTE ENGLISH|Exercise EXERCISE|2 Videos

  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION -D) (Assertion - Reason Type Questions)|10 Videos

Similar Questions

Explore conceptually related problems

In variation of specific heat capcity of a substance with temperature is given by C =A + BT ^(2) , where A and B are constnts and T is the temperature, Calculate the mean specific heat in a temperature range T = 0 to T =T and the specific heat at the mid-point T//2.

Statement-1: Specific heat for adiabatic compression is negative. Statement-2: Specific heat capacity for a gaseous system can have infinite values.

Statement-1: Machine parts are jammed in winter. Statement-2: The viscosity of lubricant used in machine part decrease at low temperature.

Statement-I: At low temperature, DH is the dominant factor for spontaneity of a reaction. Statement-II: The opposing factor TDS remains very small, at low temperature.

Statement-1 : Strength of H-bonding depends upon temperature . Statement-2 : H-bonding has no effect on specific heat of a substance . Statement-3 : One hydrogen atom bonded to an electronegative element can form only one H-bond .

Statement-1: A refrigerator transfers heat from lower temperature to higher temperature. Statement-2: Heat can be transferred from lower temperature to higher temperature by itself according to first law of thermodynamics.

Statement-1: Work and Heat are two equivalent form of energy. Statement-2: Work is transfer of mechanical energy irrespective of temperature-differene whereas heat is transfer of thermal energy because of temperature difference only.

Statement 1: A gas has a unique value of specific heat. Statement 2: Specific heat is defined as the amount of heat required to raise the temperature of unit mass of the substance through unit degree.

Statement- 1 : Absolute zero temperature is not the temperature of zero energy. Statement- 2 : Only the intenal kinetic energy of the molecules is represented by temperature.

Statement -1: Enthalpy and entropy of any elements substance in the standard states are taken as zero . Statement-2: At absolute zero , particles of the perfectly crystalline substance become completely motionless. (a)If both the statements are TRUE and STATEMENT-2 is the correct explanation of STATEMENT-9 (b)If both the statements are TRUE but STATEMENT-2 is NOT the correct explanation of STATEMENT-9 (c)If STATEMENT-1 is TRUE and STATEMENT-2 is FALSE (d)If STATEMENT-1 is FALSE and STATEMENT-2 is TRUE