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Write reactions to justify the amphoteri...

Write reactions to justify the amphoteric nature of Al.

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Al dissolves both in acids and alkalies to form hydrogen gas.
`2Al+3H_2SO_4 rarr Al_2(SO_4)_3+3H_2`
`2Al+2NaOH+6H_2O rarr 2Na^+(Al(OH)_4)^-+3H_2`
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A N EXCEL PUBLICATION-THE P-BLOCK ELEMENTS-QUESTION BANK
  1. Consider the compounds, BCI3 and C Cl4. How will they behave with wate...

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  2. Explain the shapes of BF3 and BH4^-. Assign hybridisation of Boron in ...

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  3. Write reactions to justify the amphoteric nature of Al.

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  4. What are electron deficient compounds? Are BCl3 and SiCl4 electron def...

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  5. Write down the resonance structures of CO3^(2-) and HCO3^(-)

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  6. Rationalise the statements and give chemical reactions. (i) Lead (II) ...

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  7. Rationalise the statements and give chemical reactions. (ii) Lead (IV)...

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  8. Rationalise the statements and give chemical reactions. (iii) Lead is ...

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  9. Suggest a reason why B-F bond length in BF3 (130 pm) and BF4^(-) (143 ...

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  10. Define dipole moment. The dipole moment of BF3 is zero. Why?

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  11. What happens when Borax is heated

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  12. What happens when Boric acid is added to water

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  13. What happens when Al treated with dilute NaOH

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  14. What happens when BF3 reacted with NH3

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  15. Explain the reaction Si is heated with methyl chloride at high tempera...

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  16. Explain the reaction SiO2 is treated with HF

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  17. Explain the reaction CO is heated with ZnO

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  18. Explain the reaction Hydrated alumina is mixed with aqueous NaOH

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  19. Give reasons (i) Con.HNO3 can be transported in Al containers

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  20. Give reasons (ii) A mixture of Al pieces and dilute NaOH is used to op...

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