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True/false Gold dissolves in aqua regia....

True/false
Gold dissolves in aqua regia.

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MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. Chemical formula of cryolite is

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

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  3. True/false Gold dissolves in aqua regia.

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  4. T/F Rust is Fe2O3. xH2O

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  5. Sulphide ores are concentrated by froth floatation process.

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. Define calcination and roasting.

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  20. What would happen to iron railings on the roadside if they are not pai...

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