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Regarding silica I) Quartz is amorphou...

Regarding silica
I) Quartz is amorphous form of silica
II) Silica dissolves in NaOH
III) Silica dissolves in HF
The correct combination is 

A

all are correct

B

II & III are correct

C

III are correct

D

I & III are correct

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-ELEMENTS OF CARBON FAMILY-OBJECTIVE EXERCISE - 2
  1. SiO2 is a solid while CO2 is a gas - explain.

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  2. In hydrofluorosilicic acid the covalency of Si is

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  3. Regarding silica I) Quartz is amorphous form of silica II) Silica ...

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  4. SiO(2) reacts with which of the following to form water glass

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  5. Which of the following is a crystalline form of silica ?

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  6. Hybridisation of carbon atom in carbon dioxide is

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  7. Which of the following acts as a reducing agent ?

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  8. The C-O bond order in CO and CO(2) respectively

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  9. The high poisonous nature of CO is due to its

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  10. Carboxy haemoglobin is times more stable than oxyhaemoglobin

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  11. Which of the following statements is correct?

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  12. A colourless gas which burns with blue flame and reduces CuO to Cu is

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  13. Maximum covalency exhibited by Carbon and Silicon respectively are

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  14. Two tetravalent elements A and B form dioxides. Both react with NaOH ...

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  15. Correct statements regarding silicones are a) They are used in the...

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  16. Carbon can not expand its valency beyond 4, because

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  17. Among the following substituted silanes the one which will give rise t...

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  18. Silicones are used as water proof materials because they have

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  19. When some of Si^(+4) in frame work silicates are replaced by Al^(+3) ...

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  20. The structure and hybridisation of Si(CH(3))(4) is ,

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