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State the reason why (i) carbon is no...

State the reason why
(i) carbon is not used to reduce the oxides of sodium or aluminium.
(ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green.
(iii) calcium does not occur free in nature.
(iv) zinc is used in the galvanisation of iron and not copper.

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State the reason why (i) carbon is not used to reduce the oxides of sodium or aluminium. (ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green. (iii) calcium does not occur in free state in nature. (iv) zinc is used in the galvanisation of iron and not copper.

An iron knife dipped in a blue copper sulphate solution turns the blue solution light green. Why ?

State the reason for the following : An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

Define displacement reaction. An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain.

When zinc granules are added to copper sulphate solution, the blue coloured solution-turns colourless. Give reason

DINESH PUBLICATION-METALS AND NON-METALS-Long Answer Questions
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  3. (a) Define corrosion, what is the nature given to corrosion of iron ? ...

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  4. Give reasons for the following : (i) Zinc can displace copper from c...

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  5. (a) Distinguish between 'roasting' and 'calcination'. Which of the two...

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  6. Give an example of a metal which (i) is a liquid at room temperature...

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  7. (a) Write the balanced chemical equations for the extraction of copper...

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  8. (a) Write method will you use to reduce the following ? Explain by giv...

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  9. (a) Why are ionic compounds usually hard crystalline solids ? (b) Gi...

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  10. (a) Write the balanced chemical equations for the extraction of copper...

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  11. (A) Name the components of the alloy steel and stainless steel. (b) ...

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  12. A metal M found in nature as sulphide ore (M(2)S) is one of the good c...

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  13. State the reason why (i) carbon is not used to reduce the oxides of...

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  14. (a) Write the chemical reactions taking place when : (i) Manganese ...

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  15. (a) White the steps involved in the extraction of pure metals in th...

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  16. A metal 'X' acquires a green colour coating on its surface on exposure...

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  17. Give reasons for the following : Ionic compounds have high melting ...

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  18. (a) Why are ionic compouds usually hard crystalline solids ? (b) G...

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  19. (A) Name the components of the alloy steel and stainless steel. (b) ...

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  20. State the reason why (i) carbon is not used to reduce the oxides of...

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