Home
Class 12
MATHS
Assertion(A): Na^(o+) ions are discharge...

Assertion`(A): Na^(o+)` ions are discharged in preference to `H^(o+)` ions at `Hg` cathode.
Reason `(R) : ` The nature of the cathode can affect the order of discharge of ions.
(a)If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.
(b)If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.
(c)If `(A)` is correct, but `(R)` is incorrect.
(d) If `(A)` is incorrect, `(R)` is correct.

A

Both A, R are true and R explain Assertion

B

Both A, R are true but R does't explain A

C

A is true R is false

D

A is false R is true

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion (A): Sodium ions are discharged in preference to hydrogen ions at a mercury cathode. Reason (R ): The nature of cathode can affect the order of discharge of cations.

Assertion (A) : Galvanized iron is protected from Rusting. Reason (R): Zn is less reactive than Fe . (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) . (b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A) . (c)If (A) is correct, but (R) is incorrect. (d)If (A) is incorrect, (R) is correct.

Assertion (A): The flourine has lower reactivity. Reason (R ): F-F bond has low bond dissociation energy. If both (A) and (R) are correct, and (R) is the correct explanation of (A) If both (A) and (R) are correct, but (R) is not the correct explanation of (A). If (A) is correct, but (R) is incorrect. If (A) is incorrect, but (R) is correct.

Assertion(A): Physical adsorption of milecules on the surface requires activation energy. Reason(R): Because the bonds of adsorbed molecules are broken. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) (b)If both (A) and (R) are correct, but (R) is the correct explanation of (A). (c)If (A) is correct, but (R) is incorrect. (d)If (A) is incorrect, but (R) is correct. S

Assertion (A) : in CsCl crystal, Cs^(o+) ions asopt bcc arragement. Reason (R ) : For N atoms adopting bcc arragement, there are 2N OVs . a.If both (A) and (R) are correct, and (R) is the correct explanation of (A) b.If both (A) and (R) are correct, but (R) is not the correct explanation of (A) c.If (A) is correct, but (R) is incorrect. d.If both (A) is incorrect, but (R) is correct.

Assertion (A): I_(2) can displace Cl_(2) form NaClO_(3) . Reason (R ): I is more electronegative than CI. If both (A) and (R) are correct, and (R) is the correct explanation of (A) If both (A) and (R) are correct, but (R) is not the correct explanation of (A). If (A) is correct, but (R) is incorrect. If (A) is incorrect, but (R) is correct.

Assertion: A reaction cannot become fast by itself unless a catalyst is added. Reason: A catalyst always increases the speed of a reaction. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) (b)If both (A) and (R) are correct, but (R) is the correct explanation of (A). (c)If (A) is correct, but (R) is incorrect. (d)If (A) is incorrect, but (R) is correct.

Assertion (A): Cu liberates H_(2)(g) from a dilute solution of HCl . Reason (R): Hydrogen is below Cu in the electrochemical series. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) . (b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A) . (c)If (A) is correct, but (R) is incorrect. (d)If both (A) and (R) are incorrect.

Assertion (A) : Group- 15 -doped crystal of Si are called n -type semiconductors. Reason (R ) : Neutrons are responsible for the semi-conducting properties. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) (b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A) (c)If (A) is correct, but (R) is incorrect. (d)If both (A) is incorrect, but (R) is correct.

Assertion (A) : Cu gets readily corroded in acidic aqueous solution. Reason (R) : Free energy of the process is positive. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) . (b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A) . (c)If (A) is correct, but (R) is incorrect. (d)If both (A) and (R) are incorrect.