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Physical Properties of Alkenes

When a white ...

Question

When a white crystalline compound A is heated with K2Cr2O7 and conc. H2SO4 , a reddish brown gas B is evolved, which gives a yellow coloured solution C when passed through NaOH. On adding CH3COOH and (CH3COO)2 Pb to solution C, a yellow coloured ppt. D is obtained. Also on heating A with NaOH and passing the evolved gas through K2HgI4 solution, a reddish brown precipitate E is formed. Identify A, B

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Solution

$C o m p o u n d A i s c h l o r i d e s a l t a n d B i s c h r o m y l c h l o r i d e . A - N H_{4} C l B - C r O_{2} C l_{2} C - N a_{2} C r O_{4} D - P b C r O_{4} E - N H_{2} (H g O) H g I T h e v a r i o u s r e a c t i o n s a r e 4 N H_{4} C l + K_{2} C r_{2} O_{7} + 6 H_{2} S O_{4} \to 2 C r O_{2} C l_{2} + 6 N H_{4} H S O_{4} + 2 K H S O_{4} + 3 H_{2} O C r O_{2} C l_{2} + 2 N a O H \to N a_{2} C r O_{4} + 2 H N a_{2} C r O_{4} + (C H_{3} C O O)_{2} P b \to P b C r O_{4} + 2 C H_{3} C O O N a N H_{4} C l + N a O H \to N H_{3} + N a C l + H_{2} O 2 K_{2} H g I_{4} + N H_{3} + 3 K O H \to N H_{2} (H g O) H g I + 7 K I + 2 H_{2} O$

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Similar questions

When a white crystalline compound X is heated with

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow-colored solution B is obtained. Neutralizing the solution of B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with

N a O H

solution, a colorless gas is evolved and on passing this gas into

K_{2} H g I_{4}

solution, a reddish-brown precipitate D is formed.

A

imparts green color to the flame. Its solution does not give a precipitate on passing

H_{2} S

. When it is heated with solid

K_{2} C r_{2} O_{7}

H_{2} S O_{4}

, reddish brown gas is evolved. The gas when passed in an aqueous solution of

N a O H

turns it yellow. Find out

A

.

Q. An aqueous solution of salt (A), gives white crystalline precipitate (B) with

N a C l

solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) is dissolves in hot water and the solution gives a yellow precipitate (D) on treating with

N a I

and cooling. The compound (A) does not give any gas with dilute

H C l

but liberates reddish brown gas on heating.

Compound (A) is _________.

Q. Two solid laboratory reagents (A) and (B) gives the following reactions:
Compound (A):
(i) on strongly heating gives two oxides of sulphur
(ii) on adding aqueous NaOH solution to its aqueous solution, a dirty green precipitate is obtained which starts turning brown on exposure to air
Compound (B) :
(iii) imparts green colour to the flame
(iv) Its solution does not give a precipitate on passing

H_{2} S

(v) When it is heated with solid

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, a red gas is evolved. The gas when passed in an aq NaOH solution turns it yellow
Compound (A) and (B) are identified as

F e S O_{4}

B a C l_{2}

.
If true enter 1, else enter 0.

Q. An aqueous solution of salt (A) gives a white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) dissolves in hot water and the solution gives yellow precipitate (D) on treatment with potassium iodine and on cooling. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Compounds (A) to (D) are identified as:

P b (N O_{3})_{3}

P b C l_{2}

P b S

P b I_{2}

If true enter 1, else enter 0.

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