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Aqueous ammonia is used as a precipitati...

Aqueous ammonia is used as a precipitating reagent for `Al^(3+)` ions as `Al(OH)_(3)` rather than aqueous `NaOH`, because:

A

`NH_(4)^(+)` is a week base

B

`NaOH` is a very strong base

C

`NaOH` forms soluble `[Al(OH)_(4)]^(-)` ions

D

`NaOH` forms `[Al(OH)_(2)]^(+)` ions

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The correct Answer is:
C
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Al(OH)_(3) is

Assertion:- NH_(4)OH is used as a precipitating reagent for Al^(+3) ions rather than NaOH solution. Reason:- NaOH forms water soluble complex Na[Al(OH_(4))

Percipation of Al^(3+) (aq) as Al(OH)_(3) by CO_(2) shows that:

AlCl_(3)+3NaOH to Al(OH)_(3)darr+3NaCl

Which of the following are not more basic than Al(OH)_(3) ?

Assertion : Al^(3+) ions have greater precipitating power for As_(2)S_(3) than N_(a)^(+) ions. Reason : As_(2)S_(3) sol is a negatively charged sol.

RESONANCE-P-BLOCK ELEMENT (BORON AND CARBON FAMILY)-Exercise-2 Part-I : ONLY ONE OPTION CORRECT TYPE
  1. Identify true statement:

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  2. An element E = (B,C,Si,Ge), predict E on the basic of given conditions...

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  3. In limited supply of oxygen C & Si are allowed to teacted at sufficien...

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  4. 2E+N(2)to2EN (very hard substance) EN+H(2)Oto Acid + pungent smelli...

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  5. Aluminium vessels should not be washed with materials containing washi...

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  6. Select the incorrect statement of the following.

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  7. Which of the following statements is correct for diborane?

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  8. B(2)H(6)+NH(3)to Addition compound (X) overset("450 K")to Y+Z (g) ...

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  9. Borazine and benzene show striking similarities in their properties. T...

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  10. Aqueous ammonia is used as a precipitating reagent for Al^(3+) ions as...

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  11. Borax is used as buffer since :

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  12. Which of the following sompound is obtained on heating potassium ferro...

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  13. B(OH)(3)+NaOH to Na[B(OH)(4)](aq). Then addition of which of the fo...

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  14. H(3)BO(3)(s) + aq. NaOH overset(Delta)rarr(X), H(3)BO(3)(s) + "molte...

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  15. SnCl(4) stannic chloride hydrolyses in dilute solution as per given r...

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  16. Amphoteric oxide (X) + 3C+ Cl(2) to Poisonous gas + anhydrous chloride...

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  17. Which of a solution of sodium hydroxide is addeed in excess to the sol...

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  18. BF(3) on hydrolysis forms

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  19. Preparation of organosilicones from SiCl(4) involves substituion in fi...

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  20. To get the silicone R(3)Si-(OSiR(2))(n)-SiR(3) having 4Si-O-Si linkage...

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