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Give reasons (ii) A mixture of Al pieces...

Give reasons (ii) A mixture of Al pieces and dilute NaOH is used to open drains

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The correct Answer is:
`H_2` gas is formed with high pressure by the action of NaOH and Al. The pressure so formed opens up the drain.
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A N EXCEL PUBLICATION-THE P-BLOCK ELEMENTS-QUESTION BANK
  1. Explain the reaction Hydrated alumina is mixed with aqueous NaOH

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

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

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  4. Give reasons (iii) Graphite is used as a lubricant

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  5. Give reasons (iv) Diamond is used as an abrasive

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  6. Give reasons (v) Al alloys are used to make aircraft body

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  7. Give reasons (vi) Aluminium utensils cannot be kept in water overnight

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  8. Give reasons (vii) Aluminium wire is used to make transmission cables.

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  9. Explain why is there a phenomenal decrease in ionisation enthalpy from...

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  10. Classify the oxides as neutral, acidic amphoteric and basic CO, B2O3...

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  11. A certain salt X gives the following reactions (i) Its aqueous solutio...

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  12. A certain salt X gives the following reactions (ii) It swells up to a ...

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  13. A certain salt X gives the reaction,When Con.H2SO4 is added to a hot s...

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  14. Write balanced equation for BF3+LiH rarr

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  15. Write balanced equation for B2H6+H2O rarr

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  16. Write balanced equation for NaH+B2H6 rarr

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  17. Write balanced equation for H3BO3 rarr

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  18. Write balanced equation for Al+NaOH rarr

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  19. Write balanced equation for B2H6+NH3 gives

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  20. The aqueous solution of borax is

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