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IE(1) and IE(2) of Mg are 178 and 348 kc...

`IE_(1)` and `IE_(2)` of `Mg` are `178` and `348 kcal mol^(-1)`. The energy required for the reaction `Mg rarr Mg^(2+)+2e^(-)` is

A

`+170` kcal

B

`+526` kcal

C

`-170` kcal

D

`-526` kcal

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The correct Answer is:
B
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The second ionisation energies are higher than the first ionisation energies. This is mainly due to the fact the after the removal of the first electron, the atom changes into monovalent positive ion. In the ion, the number of electrons decreases but the nuclear charge remains the same. as a result of this, the remaining electrons are held more tightly by the nucleus and it becomes difficult to remove the second electron. therefore, the value of second ionisation energy. (IE_(2)) , is greater than that of the first ionisatio energy (IE_(1)) . similarly third ionisation energy (IE_(3)) is greater than that of second IE_(2) . Q. IE_(1) and IE_(2) of Mg metal are 178 and 348 kcal/mol respectively. the energy required for the given reaction is: Mg(s) to Mg^(+2)+2e^(-)

The second ionisation energies are higher than the first ionisation energies. This is mainly due to the fact the after the removal of the first electron, the atom changes into monovalent positive ion. In the ion, the number of electrons decreases but the nuclear charge remains the same. as a result of this, the remaining electrons are held more tightly by the nucleus and it becomes difficult to remove the second electron. therefore, the value of second ionisation energy. (IE_(2)) , is greater than that of the first ionisatio energy (IE_(1)) . similarly third ionisation energy (IE_(3)) is greater than that of second IE_(2) . Q. IE_(1) and IE_(2) of Mg metal are 178 and 348 kcal/mol respectively. the energy required for the given reaction is: Mg(s) to Mg^(+2)+2e^(-)

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Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with skaked lime. Magnesium hydroxide is heated in a stream of HCI to give MhCi which is electrolysed to dischate Mg . the mixture is in the ratio 35% MgCI_(2) +50% NaCI + 15% CaCI_(2). NaCI_(2) and CaCI_(2) are added to lower the fusion temperature and to increase the conductance. Mg^(2+) +Ca(OH)_(2) rarr Mg (OH)_(2) +Ca^(2+) Mg(OH)_(2) + 2HCI rarr MgCI_(2) +2H_(2)O (liquid) Electrolysis of fused MgCI_(2) overset("Anode")rarr 2CI^(-) rarr 2_(-I)e^(@) overset("Cathode")rarr Mg^(2+) +2_(-I)e^(@) rarr Mg Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Mg^(2+) + Ca(OH)_(2) rarr Mg(OH)_(2)darr +Ca^(2+) This reaction indicates:

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VMC MODULES ENGLISH-PERIODIC PROPERTIES OF ELEMENTS-EFFICIENT
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