(D) The $s$-block elements have their last electron entering the $s$-orbital.Atomic number $3$ corresponds to $Li$ $(1s^2 2s^1)$,which is an $s$-block

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(D) The $s$-block elements have their last electron entering the $s$-orbital.Atomic number $3$ corresponds to $Li$ $(1s^2 2s^1)$,which is an $s$-block element.Atomic number $12$ corresponds to $Mg$ $([Ne] 3s^2)$,which is an $s$-block element.Therefore,the pair $(3, 12)$ represents $s$-block elements.

Class 11 Chemistry s-Block Elements Alkali metals

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Which pair of atomic numbers represents $s$-block elements?

A
$7, 15$
B
$6, 12$
C
$9, 17$
D
$3, 12$

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Class 11

Chemistry Questions

Chapter

s-Block Elements

Subtopic

Alkali metals

Give two uses of $NaCl$.

Easy

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The golden yellow colour associated with $NaCl$ in a Bunsen flame can be explained on the basis of

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Match the following metals with their oxidizing flame color.

Compound Flame color

$1$. $Li$ $a$. Crimson red

$2$. $K$ $b$. Violet

$3$. $Cs$ $c$. Blue

Compound	Flame color
$1$. $Li$	$a$. Crimson red
$2$. $K$	$b$. Violet
$3$. $Cs$	$c$. Blue

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Which of the following has maximum solubility in water?

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One of the by-products formed during the recovery of $NH_{3}$ from the Solvay process is ..... .

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Which pair of atomic numbers represents $s$-block elements?

Similar Questions

Give two uses of $NaCl$.

The golden yellow colour associated with $NaCl$ in a Bunsen flame can be explained on the basis of

Match the following metals with their oxidizing flame color. Compound Flame color $1$. $Li$ $a$. Crimson red $2$. $K$ $b$. Violet $3$. $Cs$ $c$. Blue

Which of the following has maximum solubility in water?

One of the by-products formed during the recovery of $NH_{3}$ from the Solvay process is ..... .

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Online Exam Module

Match the following metals with their oxidizing flame color.

Compound Flame color

$1$. $Li$ $a$. Crimson red

$2$. $K$ $b$. Violet

$3$. $Cs$ $c$. Blue