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The following substance will be yellow w...

The following substance will be yellow when hot and white when cold 

A

`MgO`

B

`ZnO`

C

`Na_(2)O`

D

`CaO`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-SOLIDS STATE-PRACTICE EXERCISE
  1. The unit cell of aluminium is a cube with an edge length of 405 pm. Th...

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  2. The Cubic Unit cell of a metal (molar mass = 63.55 g mol^(-1)) has an ...

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  3. CsBr crystallise in a body centred cubic lattice. The unit cell length...

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  4. When ZnO is heated to elevated temperatures which is incorrect stateme...

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  5. The electron can flow from electronic band to conduction band if theel...

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  6. The following substance will be yellow when hot and white when cold

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  7. At room temperature all crystals have

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  8. The conductivity values in MnO is in the order of

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  9. Which of the following is ferromagnetic compound ?

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  10. Among the following in which conductivity decreases with increase in t...

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  11. The nature of NiO at 250^(@)C

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  12. The number of unit cells in 58.5 g of NaCl is approximately

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  13. The 8:8 type of  packing is present in

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  14. Packing fraction in a body - centred cubic cell of crystals is

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  15. When electrons are trapped into the crystal in anion vacancy, the defe...

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  16. The radius of Na^(+) is 95 pm and that of CI^(-) ion is 181 pm. Hence ...

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  17. If the distance between Na+ and Clions in NaCl crystal is 'a'pm, what ...

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  18. When LiCl is doped with Li vapours the colour developed is

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  19. The appearance of colour in solid alkali metal halides is generally du...

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  20. In which of the following crystal structure the void efficiency is 32%...

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