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Standard XII
Chemistry
Central Atom and Ligands
An inorganic ...
Question

An inorganic mixture gives yellow precipitate on boiling with conc.HNO3 and ammonium molybdate((NH4))2MoO4). Thus, inorganic mixture can be :

A
(NH4)3PO4
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B
(NH4)3AsO4
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C
Pb(NO3)2
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D
(NH4)3C2O4
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E
None of the above
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Solution

The correct options are
A (NH4)3PO4
B (NH4)3AsO4
An inorganic mixture gives yellow precipitate on boiling with conc.HNO3 and ammonium molybdate((NH4))2MoO4). Thus, inorganic mixture can be (NH4)3PO4 and (NH4)3AsO4.

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Q. The sodium extract of an organic compound on boiling with HNO3 and on subsequent treatment with ammonium molybdate solution gives a yellow precipitate. Which of the following elements may be present in the compound?
Q. Fill in the blanks:
The sodium extract of an organic compound on boiling with HNO3 and treatment with ammonium molybdate solution gives a yellow precipitate. It indicates the precipitate of ___________ in the compound.
Q.
A colourless mixture of two substances (A) and (B) (excess) is soluble in H2O, separately. (A) turns blue litmus red and (B) turns red litmus blue. (A) gives white ppt. with (B), which dissolves in excess of (B) forming (C). (A) when placed in moist air gives fumes and can form a dimer. (A) gives white ppt. with NH4Cl and NH4OH soluble in (B). (A) also gives white precipitate with AgNO3 soluble in NH4OH.
Thus, colourless mixture contains ___________.
Q. A solution when diluted with H2O and boiled, gives a white precipitate. On addition of excess NH4Cl/NH4OH, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH4OH/NH4Cl .
Q. An inorganic Lewis acid (X) shows the following reactions:

(i) It fumes in moist air.
(ii) The intensity of fumes increases when a rod diffed in NH4OH is brought near it.
(iii) An acidic solution of (X) on addition of NH4Cl and NH4OH gives a precipitate which dissolves in NaOH solution.
(iv) An acidic solution of (X) does not give precipitate with H2S. Compound (X) is identified as AlCl3

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