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, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion : $\mathrm{Cu}_2 \mathrm{Cl}_2$ is more covalent than $\text{NaCl} .$
Reason : $\mathrm{Cu}^{+}$has more polarising power than $\mathrm{Na}^{+}$con..
→Assertion : $\mathrm{Cu}_2 \mathrm{Cl}_2$ is more covalent than $\text{NaCl} .$
Reason : $\mathrm{Cu}^{+}$has more polarising power than $\mathrm{Na}^{+}$con..
Assertion (A): A certain element X, forms three binary compounds with chlorine-containing 59.68 %, 68.95 % and 74.75 % chlorine respectively. These data illustrate the law of multiple proportions.
Reason (R): According to law of multiple proportions, the relative amounts of an element combining with some fixed amount of a second element in a series of compounds are the ratios of small whole numbers.
Reason (R): According to law of multiple proportions, the relative amounts of an element combining with some fixed amount of a second element in a series of compounds are the ratios of small whole numbers.
Assertion $(A)$ : Some metals like platinum and palladium, can be used as storage media for hydrogen.
Reason $(R)$ : Platinum and palladium can absorb large volumes of hydrogen.
→Reason $(R)$ : Platinum and palladium can absorb large volumes of hydrogen.
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 :
Assertion $(A)$ : Ozone is destroyed by solar radiation in upper stratosphere.
Reason $(R)$ : Thinning of the ozone layer allows excessive $\text{UV}$ radiations to reach the surface of earth.
→Assertion $(A)$ : Ozone is destroyed by solar radiation in upper stratosphere.
Reason $(R)$ : Thinning of the ozone layer allows excessive $\text{UV}$ radiations to reach the surface of earth.
Assertion (A): Ozonolysis of alkynes are faster than ozonolysis of alkenes.
Reason (R): Reaction proceed by cyclic transition state are faster on alkynes.
Reason (R): Reaction proceed by cyclic transition state are faster on alkynes.
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 $(A)$ : Pent $- 1-$ ene and pent $- 2 -$ ene are position isomers.
Reason $(R)$ : Position isomers differ in the position of functional group or a substituent.
→Assertion $(A)$ : Pent $- 1-$ ene and pent $- 2 -$ ene are position isomers.
Reason $(R)$ : Position isomers differ in the position of functional group or a substituent.
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 $n =1$.
Directions : In the following questions, the Assertions $(A)$ and Reason $(s) (R)$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion : In $p -$ block elements a lot of variation in properties of elements in a group is observed.
Reason : Difference in inner core of electronic configuration greatly influences the physical and chemical properties of elements. In $p - $ block elements a lot of variation in properties of elements in a group is observed.
→Assertion : In $p -$ block elements a lot of variation in properties of elements in a group is observed.
Reason : Difference in inner core of electronic configuration greatly influences the physical and chemical properties of elements. In $p - $ block elements a lot of variation in properties of elements in a group is observed.
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 $(A)$ : A liquid crystallises into a solid and is accompanied by decrease in entropy.
Reason $(R)$ : In crystals, molecules organise in an ordered manner.
→Assertion $(A)$ : A liquid crystallises into a solid and is accompanied by decrease in entropy.
Reason $(R)$ : In crystals, molecules organise in an ordered manner.
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 $(A)$ : Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.
Reason $(R)$ : The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, $\text{NO}_2^+$.
→Assertion $(A)$ : Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.
Reason $(R)$ : The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, $\text{NO}_2^+$.