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Metallic aluminium is frequently used as...

Metallic aluminium is frequently used as a reducing agent in the extraction of Cr, Mn, Fe etc.-why?

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Because of much higher affinity of Al for oxygen, Al eliminates oxygen from the oxides of moderately electropositive metals,
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-SHORT -TYPE QUESTIONS
  1. p pi - p pi back bonding occurs in the case of boron halides but not i...

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  2. AIF3 is insoluble in anhydrous HF but dissolves when NaF is added to t...

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  3. Metallic aluminium is frequently used as a reducing agent in the extra...

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  4. Is boric acid a protonic acid? Explain.

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  5. When phenolphthalein is added to an aqueous solution of borax, the sol...

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  6. Explain why diamond is hard but graphite is soft.

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  7. Graphite is a conductor of electricity but diamond is not-why?

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  8. Explain why carbon monoxide is a poisonous gas.

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  9. SiCl4 undergoes easy hydrolysis but C Cl4 does not undergo hydrolysis-...

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  10. CO2 gets absorbed in alkaline solution but CO does not under ordinary ...

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  11. CO is a superior fuel-why?

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  12. How will you get pure nickel using carbon monoxide?

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  13. Explain why solid carbon dioxide is called dry ice.

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  14. Give example: Two solids combine to give a liquid.

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  15. Explain why diamond appears to be very bright and lustrous.

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  16. (SiH3)3N is weaker base than (CH3)3N- why ?

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  17. CO cannot be dried by concentrated sulphuric acid -why?

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  18. N(CH3)3 is pyramidal but N (SiH3)3 is planar-explain.

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  19. Carbon exhibits catenation property but lead does not-why?

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  20. Which are called methanides?

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