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Which of the following has the highest m...

Which of the following has the highest melting point ?

A

NaCl

B

NaF

C

NaBr

D

NaI.

Text Solution

Verified by Experts

The correct Answer is:
B
For the same alkali metal, M.pt. of halides are in the order
Fluoride `gt` chloride `gt` bromide `gt` iodide.
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According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. Which of the following has highest melting point?

DINESH PUBLICATION-THE ALKALI METALS-RQ
  1. Certain characteristics lithium differ from those of other alkali meta...

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  2. The stability of the following alkali metal chlorides follows the orde...

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  3. Which of the following has the highest melting point ?

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  4. When CO is passed over solid NaOH heated to 200^(@)C , it forms

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  5. When a substance a reacts with water, it produces a combustible gas B ...

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  6. The metal extracted by electrolysis of its fused salt is

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  7. Which of the following has the highest conductivity ?

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  8. Cs^(+) ions impart violet colour to Bunsen flame. This is due to the f...

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  9. Which of the following electronic configuration corresponds to an ele...

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  10. A solution of sodium metal in liquid ammonia is strongly reducing due ...

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  11. Anhydrous mixture of KF and HF contains which type of ions ?

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  12. On heating sodium metal in a current of ammonia the compound formed is

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  13. Which of the following alkali metal ions has the lowest ionic mobility...

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  14. In NaCl, the chloride ions occuphy the space in a fashion of

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  15. Lithium is strongest reducing agent among alkali metals due to which o...

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  16. The alkali metal that reacts with nitrogen directly to form nitride is

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  17. Excess of Na^(+) ions in our system causes

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  18. The correct arrangement of increasing order of atomic radius among Na,...

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  19. The metal that dissolves in liquid ammonia, giving a dark blue coloure...

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  20. The number of electrons in [K^(40)]^(-1) are

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