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Nitration of Aromatics

Hydrazobenzen...

Question

Hydrazobenzene can be obtained from nitro benzene in the presence of:

A

Z n + K O H

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B

Z n + H C l

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C

Z n + Z n O

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D

Z n + H_{2} S O_{4}

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Solution

The correct option is A $Z n + K O H$
Nitrobenzene reacts with zinc powder in the presence of alcoholic $K O H$ to form hydrazobenzene.

$C_{6} H_{5} {N O}_{2} + Z n P o w d e r a l c o h o l i c K O H - -------- \to C_{6} H_{5} - N H - N H - C_{6} H_{5} h y d r a z o b e n z e n e$

Option A is correct.

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Similar questions

List- I	List- II
A) $C_{6} H_{5} N O_{2} S n + H C l - ----- \to$	i) Azobenzene
B) $C_{6} H_{5} N O_{2} Z n + N H_{4} C l - ------- \to$	ii) Hydrazobenzene
C) $C_{6} H_{5} N O_{2} L i A l H_{4} - --- \to$	iii) Phenyl hydroxyl amine
D) $C_{6} H_{5} N O_{2} Z n + K O H_{(a l c .)} - -------- \to$	iv) Amino benzene

The chief ore of

Z n

is the sulphide,

Z n S

. The ore is concentrated by froth floatation process and then heated in air to convert

Z n S

Z n O

2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}

75 %

Z n O + H_{2} S O_{4} \to Z n S O_{4} + H_{2} O

100 %

2 Z n S O_{4} + 2 H_{2} O \to 2 Z n + 2 H_{2} S O_{4} + O_{2}

80 %

Z n

obtained from a sample of ore containing

292.2

Z n S

Complete and balance the following reactions.

(a) $N a + H_{2} O \to$ _________ + _________

(b) $C a + H_{2} O \to$ __________+_________

(c) $M g + H_{2} O \to$ __________+_________

(d) $Z n + H_{2} O \to$ ___________+_________

(e) $F e + H_{2} O \to$ ____________+_________

(f) $Z n + H C l \to$ _____________+__________

(g) $A l + H_{2} S O_{4} \to$ __________+_________

(h) $F e + H C l \to$ ___________+____________

(i) $Z n + N a O H \to$ __________+____________

(j) $A l + K O H + H_{2} O$ _________+____________

Q. The chief ore of

Z n

is its sulphide,

Z n S

. The ore is concentrated by froth floatation process and then heated in air to convert

Z n S

Z n O

. The following reactions take place in the extraction of

Z n

2ZnS+3O2→2ZnO+2SO2 (Yield: 62.5 \%)

ZnO+H2SO4→ZnSO4+H2O (Yield: 80 \%)

2ZnSO4+2H2O→2Zn+2H2SO4+O2 (Yield: 80\%)

The number of moles of

Z n S

required for producing

2

Z n

Q. The chief ore of zinc is the sulphide,

Z n S

. The ore is concentrated by floatation process and then heated in air, which converts the

Z n S

Z n O

I .

2 Z n S + 3 O_{2} 90.6 % - -- \to 2 Z n O + 2 S O_{2}

Z n O

is then treated with dilute

H_{2} S O_{4}

I I .

2 Z n O + 2 H_{2} S O_{4} 100 % - -- \to 2 Z n S O_{4} + 2 H_{2} O

Z n

metal is produced on electrolysis.

I I I .

2 Z n S O_{4} + 2 H_{2} O 98.2 % - -- \to 2 Z n + 2 H_{2} S O_{4} + O_{2}

Efficiencies of the processes have been indicated above the arrow mark. Mass of

Z n

will be obtained from an ore containing

225

Z n S

in kg is (nearest integer value):

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