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Standard XII

Chemistry

Stoichiometry

A gives white...

Question

(A) gives white ppt with $A g N O_{3}$ soluble in aq $N H_{3}$ . (A) gives green ppt (B) with NaOH but ppt dissolves to yellow solution (C) when heated with $H_{2} O_{2}$ . (C) gives yellow ppt (D) with $B a C l_{2}$ .
According to above experiment complete the matrix.

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Solution

The compound (A) is $C r C l_{3}$ . It gives white ppt of AgCl with $A g N O_{3}$ which is soluble in aq $N H_{3}$ .
$C r C l_{3} + 3 A g N O_{3} \to 3 A g C l ↓ (w h i t e p p t) + C r (N O_{3})_{3}$
$A g C l + 2 N H_{3} \to [A g (N H_{3})_{2}] C l$
(A) gives green ppt (B) of $C r (O H)_{3}$ with NaOH but ppt dissolves to yellow solution (C) of $N a_{2} C r O_{4}$ when heated with $H_{2} O_{2}$ .
$C r C l_{3} + 3 N a O H \to C r (O H)_{3} ↓ (g r e e n p p t) + 3 N a C l$
$C r (O H)_{3} H_{2} O_{2} - --- \to N a O H N a_{2} C r O_{4} (y e l l o w s o l u t i o n)$
The compound (C) $(N a_{2} C r O_{4})$ gives yellow ppt (D) of $B a C r O_{4}$ with $B a C l_{2}$ .
$N a_{2} C r O_{4} + B a C l_{2} \to B a C r O_{4} + 2 N a C l$
A.
$C r C l_{3}$
B.
$C r (O H)_{3}$
C.
$N a_{2} C r O_{4}$
D.
$B a C r O_{4}$

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Similar questions

Q. (A) (colourless solution) gives white ppt (B) with NaOH solution but ppt dissolves in excess of NaOH forming (C). (C) does not give ppt with

H_{2} S

but on boiling with

N H_{4} C l

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A g N O_{3}

State True or False.

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A l B r_{3}

Q. Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing

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Q. (A) gives white ppt (B) with NaOH, but (B) dissolves in excess of NaOH forming (C). (C) gives white ppt (D) when

H_{2} S

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B a C l_{2}

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H N O_{3}

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Q. Metal nitrate

(A)

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(B)

which goes into the solution with dil.

H C l

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C

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and the solution is treated with potassium chromate to yellow ppt.

(D)

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V

with dil.

H_{2} S O_{4}

also gives white ppt.

(E)

insoluble in dil.

H C l

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(E)

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The yellow precipitate

(D)

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One cationic complex has two isomers A and B. Each has one

C o^{3 +}

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N H_{3}

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B r^{-}

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S O_{4}^{2 -}

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B a C l_{2}

while B give yellow ppt with

A g N O_{3}

B can be :

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A.	$C r C l_{3}$
B.	$C r (O H)_{3}$
C.	$N a_{2} C r O_{4}$
D.	$B a C r O_{4}$

(A) gives white ppt with AgNO3 soluble in aq NH3. (A) gives green ppt (B) with NaOH but ppt dissolves to yellow solution (C) when heated with H2O2. (C) gives yellow ppt (D) with BaCl2. According to above experiment complete the matrix.

(A) gives white ppt with $A g N O_{3}$ soluble in aq $N H_{3}$ . (A) gives green ppt (B) with NaOH but ppt dissolves to yellow solution (C) when heated with $H_{2} O_{2}$ . (C) gives yellow ppt (D) with $B a C l_{2}$ .
According to above experiment complete the matrix.