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Green Chemistry

Which of the ...

Question

Which of the following reaction occur when urea is added to soil as a fertilizer?

A

N H_{2} C O N H_{2} ⟶ H N C O + N H_{3}

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B

N H_{2} C O N H_{2} + H_{2} O ⟶ 2 N H_{3} + C O_{2}

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C

2 N H_{2} C O N H_{2} ⟶ H_{2} N C O N H C O N H_{2} + N H_{3}

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D

Both 1 and 2

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Solution

The correct option is C $N H_{2} C O N H_{2} + H_{2} O ⟶ 2 N H_{3} + C O_{2}$
Urea is a major fertilizer used worldwide. It provides nitrogen to the soil by decomposing to ammonia and $C O_{2}$ when acted on by urease, an enzyme in soils. Then, ammonia is taken by the plants.

$N H_{2} C O N H_{2} + H_{2} O ⟶ 2 N H_{3} + C O_{2}$

Hence the correct option is B.

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Similar questions

(N H_{2} C O N H_{2})

C O_{2}

N H_{3}

.

C O_{2} + 2 N H_{3} ⟶ N H_{2} C O N H_{2} + H_{2} O

N H_{3}

C O_{2}

are obtained in the following steps:

I

N_{2} + 3 H_{2} 90 % - - \to 2 N H_{3}

I I

C a C O_{3} 50 % - - \to C a O + C O_{2}

N_{2}

C a C O_{3}

required to produce

60

X

Y

kg respectively. The value of

X + Y

(nearest integer value ) is :

Q. Percent yield of

N H_{3}

in the following reaction is

80 %

.

N H_{2} C O N H_{2} + 2 N a O H Δ - \to N a_{2} C O_{3} + 2 N H_{3}

6

N H_{2} C O N H_{2}

8

N a O H

N H_{3}

Q. Percent yield of

N H_{3}

in the following reaction is

80 % .

N H_{2} C O N H_{2} + 2 N a O H Δ - \to N a_{2} C O_{3} + 2 N H_{3}

N H_{2} C O N H_{2}

N a O H

x

N H_{3}

x

[Note: in g as nearest integer]

Q. Percent yield of

N H_{3}

in the following reaction is

80 %

.

N H_{2} C O N H_{2} + 2 N a O H Δ - \to N a_{2} C O_{3} + 2 N H_{3}

6

N H_{2} C O N H_{2}

8

N a O H

x

N H_{3}

. Find the value of

x

.

Q. Calculate the change of entropy

Δ_{r} S_{m}^{\circ}

at 298 K for the reaction in which urea is formed from

N H_{3}

C O_{2}

. The standard entropy of

N H_{2} C O N H_{2}

J K^{- 1} m o l^{- 1}

N H_{3}

C O_{2}

H_{2} O

it is 192.3, 213 and 69.9

J K^{- 1}

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