Which pair is different from the others ?

L i - M g

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B - A l

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N a - K

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C a - M g

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Solution

The correct option is A $L i - M g$
$L i - M g \to$ diagonal relationship.
Li and Mg show a diagonal relationship. Because of which they show various similar properties.

$B - A l, N a - K$ and $C a - M g \to$ belongs to the same group.

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Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Q. Which of the following set of elements is written correctly in the order of their increasing metallic character?

(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca

Q. Question 26
Which of the following set of elements is written in order of their increasing metallic character?

(a) Be, Mg, Ca
(b) Na, Li, K
(c) Mg, Al, Si
(d) C, O, N

Q. Which one of the following set of ions represents the collection of isoelectronic species?
[Atomic numbers: F = 9; Cl = 17; Na = 11; Mg = 12; Al = 13; K = 19; Ca = 20; Sc = 21]

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Which pair is different from the others ?

The correct option is A Li−MgLi−Mg→ diagonal relationship.Li and Mg show a diagonal relationship. Because of which they show various similar properties.B−Al,Na−K and Ca−Mg→ belongs to the same group.

The correct option is A $L i - M g$
$L i - M g \to$ diagonal relationship.
Li and Mg show a diagonal relationship. Because of which they show various similar properties.

$B - A l, N a - K$ and $C a - M g \to$ belongs to the same group.