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Sodium is made by the electrolysis of a ...

Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% `CaCl_2` because
(a)`Ca^(2+)` ion can reduce NaCl to Na
(b)`CaCl_2` helps in conduction of electricity
(c)this mixture has a lower melting point than NaCl
(d)`Ca^(2+)` can displace Na from`NaCl`.

A

`Ca^(2+)` ion can reduce NaCl to Na

B

`CaCl_2` helps in conduction of electricity

C

this mixture has a lower melting point than NaCl

D

`Ca^(2+)` can displace Na from`NaCl`.

Text Solution

Verified by Experts

The correct Answer is:
C
this mixture has a lower melting point than NaCl
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ICSE-THE s - BLOCK ELEMENTS-OBJECTIVE (MULTIPLE CHOICE) TYPE QUESITONS (Choose the correct option in the following questions)
  1. Alkali metals give colour in Bunsen flame due to

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  2. Which is manufactured by electrolysis of fused sodium chloride?

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  3. Sodium is made by the electrolysis of a molten mixture of about 40% Na...

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  4. Sodium carbonate is manufactured by Solvay process. The products that ...

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  5. Which of the following compounds is efflorescent ?

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  6. The outer electronic configuration of alkaline earth metals is

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  7. Electrolysis of KCl. MgCl2 . 6H2O gives: potassi...

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  8. Which of the following metals is present in chlorophyll ?

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  9. Which of the following metal carbonates is decomposed on heating?

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  10. Write the equations for the following and balance them Magnesium rea...

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  11. Mixture of MgCl2 and Mgo is called

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  12. The flame test with a salt P gave a brick red flame. What is the catio...

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  13. A substance absorbs CO2 and violently reacts with water. The substance...

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  14. What is plaster of Paris and how is it prepared?

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  15. Portland cement is manufactured by using

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  16. Which one of the following components of cement sets at the slowest ra...

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  17. When Na2CO3 . 10 H2O is kept open in air, it (a)absorbs moisture (b)...

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  18. Describe the setting of plaster of Paris.

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  19. Which of the following elements differs from the rest in several physi...

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  20. What is Sorel's cement and how is it prepared?

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