Which of the following is arranged in order of increasing radius? - Vidyadip

MCQ

Which of the following is arranged in order of increasing radius?

✓
$Li^+ \,(aq) < Na^+ \,(aq) < K^+ \,(aq)$
B
$Na^+ \,(aq) < K^+ \,(aq) < Li^+ \,(aq)$
C
$K^+\, (aq) < Li^+ \,(aq) < Na^+\,(aq)$
D
$K^+\, (aq) < Na^+\, (aq) < Li^+ \,(aq)$

✓

Answer

Correct option: A.

$Li^+ \,(aq) < Na^+ \,(aq) < K^+ \,(aq)$

a
On moving down the group atomic and ionic radii increases. $L i^{+}, N a^{+}$ and $K^{+}$ all belong to group $1$. On moving top to bottom they appear in the order $Li ^{+}, Na ^{+}$and $K ^{+}$.

So, $K^{+}$has the largest ionic radii, followed by $N a^{+}$ and $L i^{+}$ being the smallest.

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