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STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
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
    $(A)$ is false but $(R)$ is true.
  • ✓
    $(A)$ is true but $(R)$ is false
  • C
    Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A)$
  • D
    Both $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A)$
✓

Answer

Correct option: B.
$(A)$ is true but $(R)$ is false
b
$I$. In $p-$Block both metals and non metals are present but in $d$-Block only metals are present.

$II$. $EN$ and $IE$ of non metals are greater than that of metals

$I$ - False, $II$-True

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