Chemistry
Assertion (A): The volume occupied by a gas is negligible at zero degree centigrade temperature.
Reason (R): Molecular motion ceases at 0 K.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is false but R is true.
Explanation— Gases follow charles's law, volume of given mass of gas is directly proportional to its absolute temperature. At 0°C, a gas still behaves mostly like an ideal gas under standard pressure, and its volume is not negligible. Hence, the assertion (A) is false.
Molecular motion increases with rising temp and decreases with lowering temperature. When the temperature is zero on kelvin scale, the molecular motion ceases. Hence, the reason (R) is true.
Related Questions
The term used for the graph of volume vs pressure for the verification of Boyle's law is :
P — Isobar
Q — Isotherm
R — Isotope
- Only P
- Only Q
- Only R
- Both P and Q
Assertion (A): Inflating a balloon seems to violate Boyle's law.
Reason (R): Boyle's law is valid for a fixed mass. Here, the mass of gas is changing.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Gases exert pressure on the walls of the container they are kept in.
Reason (R): Gas molecules have a large kinetic energy. They strike the walls of the container in which they are kept with a certain force. The force per unit area is responsible for the pressure of the gas.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The volumes of gases are first converted into STP conditions and then compared.
Reason (R): Volume does not vary with temperature and pressure in gases.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.