Question:
In Kjeldahl's method, ammonia from $5\, g$ of food neutralizes $30 \,cm^3$ of $0.1\, N$ acid. The percentage of nitrogen in the food is
In Kjeldahl's method, ammonia from $5\, g$ of food neutralizes $30 \,cm^3$ of $0.1\, N$ acid. The percentage of nitrogen in the food is
Updated On: Apr 13, 2024
- 8.4
- 0.84
- 1.68
- 16.8
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The Correct Option is B
Solution and Explanation
From Kjeldahl's method,
percentage of nitrogen
$=\frac{1.4 \times N \times V}{w}=\frac{1.4 \times 0.1 \times 30}{5}$
$=0.84 \%$
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Concepts Used:
Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism
SN1 Reaction Mechanism:
SN1 reaction mechanism takes place by following three steps –
- Formation of carbocation
- Attack of nucleophile
- Deprotonation
SN2 Reaction Mechanism:
The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.
Electrophilic Aromatic Substitution Reaction Mechanism:
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
- A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
- Due to the breaking of the C-H sigma bond, a proton is removed.
- The C=C bond is reformed and it restores the aromaticity of the compound.
Electrophilic Substitution Reaction Mechanism:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.
- Electrophile Generation
- Carbocation Formation
- Proton Removal