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Standard XII

Chemistry

Physical Properties of Boron Family

19. Mg forms ...

Question

19. Mg forms Mg(ll) because of :- 1) The oxidation state of Mg is +2 2) Difference between I. P1 and I. P2 is greater than 16.0 eV 3) There is only one electron in the outermost energy level of Mg 4) Difference between I. P1 and I. P2 is less than 11eV

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Statement - I: $M g^{2 +} a n d A l^{3 +}$ are isoelectronic but ionic radius $A l^{3 +}$ is less than that of $M g^{2 +}$ .
Statement - II: The effective nuclear charge on the outer-shell electrons in $A l^{3 +}$ is more than that in $M g^{2 +}$

Q. Assertion :

M g^{2 +}

and

A l^{3 +}

are isoelectronic but ionic radius of

A l^{3 +}

is less than of

M g^{2 +}

Reason: The effective nuclear charge on the outershell electrons in

A l^{3 +}

is more than that in

M g^{2 +}

Q. Given 3 points with position vectors

_{1},_{2} a n d_{3}

which form the vertices of a triangle with side lengths

a = |_{2} -_{1} |, b = |_{3} -_{2} |, c = |_{1} -_{3} |

. Then the in-centre is given by

Q. The

△_{i} H_{1}

and

△_{i} H_{2}

of Mg(g) are 740 and 1450 kJ

△_{i} H_{2}

{m o l}^{- 1}

. Calculate the percentage of

{M g}^{+} (g)

and

{M g}^{2 +} (g)

if 1 g of Mg(g) absorbs 50 kJ of energy.

Q. Which of the following relation is correct with respect to

I^{s t}

and

2^{n d}

Ionization energy of Sodium and Magnesium?

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