JEE Main 2021 (Online) 31st August Morning Shift | Periodic Table & Periodicity Question 58 | Chemistry

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.

Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.

In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is false but (R) is true.

(A) is true but (R) is false

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)

-1

The correct order of ionic radii for the ions, P^3$$-$$, S^2$$-$$, Ca²⁺, K⁺, Cl^$$-$$ is :

P^3$$-$$ > S^2$$-$$ > Cl^$$-$$ > K⁺ > Ca²⁺

Cl^$$-$$ > S^2$$-$$ > P^3$$-$$ > Ca²⁺ > K⁺

P^3$$-$$ > S^2$$-$$ > Cl^$$-$$ > Ca²⁺ > K⁺

K⁺ > Ca²⁺ > P^3$$-$$ > S^2$$-$$ > Cl^$$-$$

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Barium carbonate is insoluble in water and is highly stable.

Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.

Both (A) and (R) are true and (R) is the true explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the true explanation of (A)

(A) is false but (R) is true.

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

The correct order of first ionisation enthalpy is :

Mg < S < Al < P

Mg < Al < S < P

Al < Mg < S < P

Mg < Al < P < S