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(b) Why do transition metals form alloy ...

(b) Why do transition metals form alloy ?

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(a) Why do Zr and Hf have similar properties? (b) What happens when K_2Cr_2O_7 is treated with H_2SO_4 and NaCl solution ? (c) Why do transition metals form alloys easily?

(a) What is Lanthanoid contraction? Give the cause of lanthanoid contraction. (b) Why do transition metals form many coloured ions?

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(i) Why do transition metals form a large number of alloys? (ii) Write the steps with chemical reactions involved in the preparation of K_2Cr_2O_7 from chromite ore.

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CBSE COMPLEMENTARY MATERIAL-PRACTICE PAPER 1-Questions
  1. What is the role of silica in the extraction of copper?

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  2. What type of metals are generally extracted by electrolytic method?

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  3. (b) Why do transition metals form alloy ?

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  4. Give reasons for the following: Mn(2)O(3) is basic whereas Mn(2)O(7)...

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  5. Give reasons for the following: Eu^(2+) is a strong reducing agent.

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  6. Write the structure of monomers used for getting the following polymer...

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  7. Write the structure of monomers used for getting the following polymer...

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  8. Write the structure of monomers used for getting the following polymer...

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  9. Is [-CH(2)-overset(CH(3))overset(|)(CH)-](n) a homopolymer or copolyme...

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  10. Write the monomers of the following polymer:

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  11. What is the function of S in the vulcanization of rubber?

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  12. Why is bithional added to soap ?

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  13. Between sodiumhydrogen carbonate and magnesium hydroxide , which i...

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  14. Why are detergents non - biodegradable while soap are biodegradable ?

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  15. Define terms with a suitable example : Antibiotics

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  16. Artificial sweeteners.

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  17. Define terms with a suitable example : Analgesics

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  18. Write the structures of main products when benzene diazonium chloride ...

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  19. Out of (CH(3))(3)C-Br and (CH(3))(3)C-I, which one is more reactive to...

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