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Which of the following oxides of group 2...

Which of the following oxides of group 2 elements is amphoteric ?

A

SrO

B

BeO

C

MgO

D

CaO

Text Solution

Verified by Experts

The correct Answer is:
B
As the atoms becomes larger, the ionization enthalpy decreases and the elements become more basec. BeO is in soluble in water but dissolved in acids to give salts
`BeO+HCl toBeCl_(2)+H_(2)O`
And in alkalis to give beryllates, which on stading precipitate as hydroxide.
`BeO+NaOHtoNa_(2)BeO_(2)+H_(2)O`
BeO is, therefore, amphoteric.
MgO reacts with water forming `Mg(OH)_(2)` which is extermely insoluble in water and hence weakly basic. CaO Reacts `Ca(OH)_(2)` which is a moderately strong base. `Sr(OH)_(2)` and `Ba(OH)_(2)` are even stronger bases. the reaction of these oxides with water sometimes is known as slaking.
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R SHARMA-THE S BLOCK ELEMENTS-Follow-up Test 10
  1. The enthalpies of formation of group 2 oxides are quite high (highly n...

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  2. Which of the following oxides react exothermically with water forming ...

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  3. Which of the following oxides of group 2 elements is amphoteric ?

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  4. The hydroxide of is obtained by treating the metal with cold water.

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  5. Which of the following hydroxides is the most soluble in water ?

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  6. Which of the following hydroxides of group 2 elements is amphoteric ?

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  7. The most thermally stable hydroxide is

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  8. Which of the following halides are ionic in nature ?

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  9. All the halides of group 2 elements form hydrates and are hygroscopic ...

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  10. When hydrated MgCI(2).6H(2)O is trongly heated,

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  11. The hydrated halides of cannot be dehydrated on heating.

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  12. Fused BeF(2) is

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  13. Which of the following compounds is highly soluble in water ?

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  14. Which of the following compounds are water soluble ?

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  15. Which of the following solids is polymeric ?

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  16. Beryllium chloride vapor contains

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  17. Because it is cheap (a byproduct of the Solvay process) and deliquesce...

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  18. Which of the following is incorrect about the carbonates of alkaline e...

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  19. Which of the following carbonates is the least soluble in water ?

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  20. Which of the following carbonates is the most thermally stable ?

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