Question
✓
Answer
(b) Both A and R are true but R is not the correct explanation of A .
Explanation: Both A and R are true but R is not the correct explanation of A .
Explanation: Both A and R are true but R is not the correct explanation of A .
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In the following questions a statement of assertion $(A)$ followed by a statement of reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : Among isomeric pentanes, $2, 2-$ dimethylpentane has highest boiling point.
Reason $(R)$ : Branching does not affect the boiling point.
→Assertion $(A)$ : Among isomeric pentanes, $2, 2-$ dimethylpentane has highest boiling point.
Reason $(R)$ : Branching does not affect the boiling point.
Assertion (A): Splitting of the spectral lines in the presence of a magnetic field is known as the Stark effect.
Reason (R): The line spectrum is simplest for the hydrogen atoms.
Reason (R): The line spectrum is simplest for the hydrogen atoms.
Assertion $(A)$ : At constant temperature, $pV$ vs $V$ plot for real gases is not a straight line.
Reason $(R)$ : At high pressure all gases have $Z > 1$ but at intermediate pressure most gases have $Z < 1.$
→Reason $(R)$ : At high pressure all gases have $Z > 1$ but at intermediate pressure most gases have $Z < 1.$
Assertion (A): Each side of a cube is measured to be 7.203 m . What is the volume of the cube to appropriate significant figure $373.7 m^3$.
Reason (R): The mass of one mole of a substance in grams is called its average atomic mass.
→Reason (R): The mass of one mole of a substance in grams is called its average atomic mass.
Assertion (A): In Sommerfeld's model, circular orbit is possible for the electron in K shell.
Reason (R): Electron present in $K$ shell corresponds to principal quantum number $n =1$.
→Reason (R): Electron present in $K$ shell corresponds to principal quantum number $n =1$.
Assertion: A spectral line will be seen for a $2 p_x \rightarrow 2 p_y$ transition.
Reason: Energy is released in the form of waves of light when the electron drops from $2 p_{ v }$ to 2 p orbital.
→Reason: Energy is released in the form of waves of light when the electron drops from $2 p_{ v }$ to 2 p orbital.
Note : In the following question a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given below question.
Assertion $(A)$ : Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason $(R)$ : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.
→Assertion $(A)$ : Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason $(R)$ : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.
Note : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : Black body is an ideal body that emits and absorbs radiations of all frequencies.
Reason $(R)$ : The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
→Assertion $(A)$ : Black body is an ideal body that emits and absorbs radiations of all frequencies.
Reason $(R)$ : The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
Notes : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the Choices given below each question.
Assertion $(A)$ : Combustion of all organic compounds is an exothermic reaction.
Reason $(R)$ : The enthalpies of all elements in their standard state are zero.
→Assertion $(A)$ : Combustion of all organic compounds is an exothermic reaction.
Reason $(R)$ : The enthalpies of all elements in their standard state are zero.
Assertion (A): Both cyclopropane and propene give addition reactions readily.
Reason (R): Cyclopropane and propene are isomers of each other.
Reason (R): Cyclopropane and propene are isomers of each other.