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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Increasing order of non $-$ metallic character is $: \ce{Si < B < C < N < F}.$
Reason : Non $-$ metallic character increases along a period and decreases down the group.
  • ✓
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: A.
Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
$\begin{matrix}\text{Period/Group} & 13 &14 & 15 & 16 & 17\\ 2 &\text{B}&\text{C} &\text{N}& - &\text{F}\\3 & -&\text{Si}&- & -&-\end{matrix}$
As non $-$ metallic character increases along a period and decreases down a group, $\ce{Si}$ is the least non $-$ metallic element and non $-$ metallic character increases from $B$ to $C$ to $N$ to $F.$ Hence, increasing order of non $-$ metallic character is $: \ce{Si < B < C < N < E}.$

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