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Chemical formula of cryolite is...

Chemical formula of cryolite is

A

`Al_2O_3. 2H_2O`

B

`Na_3 AlF_6`

C

`Na_2AlF_6`

D

`NaAlF_3`

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MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. Consider the following displacement reactions: A+BSO4rarrASO4+B C+ASO4...

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  2. Which of the following reactions cannot occurs?

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  3. Chemical formula of cryolite is

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  4. Which of the following is the sulphide ore of copper?

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  5. True/false Gold dissolves in aqua regia.

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  6. T/F Rust is Fe2O3. xH2O

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  7. Sulphide ores are concentrated by froth floatation process.

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  8. True/false the alloy invar contains iron and aluminium.

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  9. Can copper displace iron from iron sulphate solution? Give reasons.

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  10. The rockey material found with ores is known as…………….

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  11. Fill ups Most oxides of metal are………………in nature.

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  12. Fill ups the percentage of gold in 22 carat gold is………….. .

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  13. Fill ups In galvanisation iron is protected by the coating of………….. .

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  14. In the electrorefining of copper,some gold is deposited as:

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  15. Why ae metals called electropositive elements and non-metals called el...

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  16. Which of the two metals copper and silver is more reactive?

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  17. Name two metals which react with dilute nitric acid to produce hydroge...

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  18. Give one example of each of metal that is good conductor of electricit...

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  19. An element M forms an oxide M2O3. Which is acidic in nature. State whe...

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  20. A solution of CuSO4 was kept in an iron pot. After a few days the iron...

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