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Explain the following: Reactivity of Al ...

Explain the following:
Reactivity of Al decreases if it is dipped in `HNO_3`.

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MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. A solution of CuSO4 was kept in an iron pot. After a few days the iron...

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  2. Define calcination and roasting.

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

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  4. Explain the following: Carbon cannot reduce the oxides of Na and Mg.

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  5. Explain the following: Reactivity of Al decreases if it is dipped in H...

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  6. Explain the following: Titanium is a strategic metal.

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  7. A,B and C are three elements which undergo chemical changes according ...

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  8. A,B and C are three elements which undergo chemical changes according ...

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  9. Consider the following reactions : (i) A + B SO4 rarr a SO4 +B (ii...

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  10. With the help of diagram show the transfer of electrons between the at...

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  11. Why are ionic compounds usually hard?

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  12. Ionic solids conduct electricity in the molten state but not in the so...

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  13. Name the solvent in which ionic compounds are generally soluble.

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  14. Zinc granules are placed in each of the four solutions A,B,C and D as ...

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  15. Which of the following reaction does not occur:

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  16. Ferrous sulphate crystals are dissolved in water. The colour of the so...

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  17. Two beakers A and B contain iron sulphate solution. In beaker A, a sma...

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  18. Write chemical equatoins for this following reactions. Zinc carbonate ...

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  19. What happens when a mixture of Cu2O and Cu2S is heated?

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  20. A metal M does not liberate hydrogen from acids but reacts with oxygen...

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