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Beryllium is placed above magnesium in t...

Beryllium is placed above magnesium in the `II` group. Beryllium dust, therefore, when added to `MgCl_(2)` solution will:

A

Have no effect

B

Precipitates Mg metal

C

Leads to the dissolution of Be metal

D

Form A complex

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The correct Answer is:
A
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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 slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl_(2) which is electrolysed to discharge Mg. The mixture is in the ratio 35% MgCl_(2)+50% NaCl+15% CaCl_(2) . NaCl and CaCl_(2) are added to lower the fusion temperature and to increases the conductance. Mg^(2+) +Ca(OH)_(2) to Mg(OH)_(2)+Ca^(2+) Mg(OH)_(2)+2HCl to MgCl_(2)+2H_(2)O(l) Electrolysis of fused MgCl_(2) hArr Mg^(2+)+2Cl Mg^(2+)+2e^(-) to Mg ( At Cathode) 2Cl^(-) to Cl_(2)+2e^(-) (At Anode) Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Molten mixutre of NaCl and CaCl_(2) is added to the heated MgCl_(2) because :

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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 slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl_(2) which is electrolysed to discharge Mg. The mixture is in the ratio 35% MgCl_(2)+50% NaCl+15% CaCl_(2) . NaCl and CaCl_(2) are added to lower the fusion temperature and to increases the conductance. Mg^(2+) +Ca(OH)_(2) to Mg(OH)_(2)+Ca^(2+) Mg(OH)_(2)+2HCl to MgCl_(2)+2H_(2)O(l) Electrolysis of fused MgCl_(2) hArr Mg^(2+)+2Cl Mg^(2+)+2e^(-) to Mg ( At Cathode) 2Cl^(-) to Cl_(2)+2e^(-) (At Anode) Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Molten mixture contains Mg^(2+), Na^(+) and Ca^(2+) but at cathode only Mg^(2+) is discharged because :

Like lithium in group 1 , beryllium shows anomalous behavior in group 2 Write three such properties of beryllium which make it anomalous in the group.

ALLEN-S-BLOCK ELEMENTS -EXERCISE
  1. Na(2)[Be(OH)(4)] is formed when:

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  2. Which is/are true statement(s) when metal carbides react with H(2)O?

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  3. Beryllium is placed above magnesium in the II group. Beryllium dust, t...

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  4. Potassium is kept in

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  5. Which of the following is not present in cement ?

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  6. A wire of an alkaline earth metal X, burnt in air and dipped in water,...

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  7. Which of the following statement is correct for s-block elements:

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  8. One element which is used in flash light in photography, when heated w...

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  9. The s-block hydride with covalent polymeric structure are

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  10. Assertion: Na(2)O(2) is coloured and paramagnetic Reason: Na(2)O(2) ...

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  11. Assertion: KHCO(3) can not be obtained by solvay process. Reason: KH...

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  12. Assertion: Mg can burn in the atmosphere of N(2). Reason: Mg reacts ...

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  13. Assertion: Li(2)SO(4) do not form double salt like alum. Reason: Ato...

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  14. Assertion: Li and Mg shows similar chemical properties. Reason Li an...

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  15. Assertion: NaCI when exposed in air it becomes wet. Reason: NaCI con...

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  16. Assertion: Lithium is most reducing element. Reason: IP of lithium i...

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  17. Assertion: Lithium is the weakest reducing agent among alkali metals. ...

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  18. Assertion: When cement is mixed with water and left as such, it become...

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  19. Assertion: Beryllium is most reducing s-block element Reason: Hydrat...

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  20. Assertion: Halides of Be dissolve in organic solvents Reason: Atomic...

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