Test Index

AIEEE 2009 Solved Paper

Section: Chemistry

Question : 29 of 89

Marks: +1, -0

Solution:

In periodic table

\mathrm{Li}, \mathrm{Na}, \mathrm{Mg}, \mathrm{Be}

are present in following ways :-

Group 1	Group 2
Li	Be
Na	Mg

Note:

(1) In periodic table from left to right the size of element decreases.

(2) In periodic table, from top to bottom size of element increases.

So,

\mathrm{Be}^{+2}

will be the smallest in size.

Among

\mathrm{Li}^{+}

and

\mathrm{Na}^{+}

, size of

\mathrm{Na}^{+} > \mathrm{Li}^{+}

and among

\mathrm{Be}^{+2}

and

\mathrm{Mg}^{+2}

, size of

\mathrm{Mg}^{+2} > \mathrm{Be}^{+2}

So, the correct order will be,

\mathrm{Na}^{+} > \mathrm{Li}^{+} > \mathrm{Mg}^{+2} > \mathrm{Be}^{+2}

Go to Question:

Prev Question

Next Question