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In Zeisel's method for the determination of methoxyl groups, a sample of 2.68 gm of a compound (A) gave 14.08 gm of AgI. If the molecular weight of compound (A) is 134, the number of (—OCH₃) group(s) in the compound (A) is:

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Important Questions on Organic Chemistry - Some Basic Principles and Techniques

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

In the Kjeldahl's method of estimation of nitrogen, ammonia gas evolved from

0.3 g

of an organic compound was absorbed in

60 mL

\frac{1}{10} M

sulphuric acid. The unused acid required

40 mL

\frac{N}{10} NaOH

for complete neutralisation. The weight percentage of nitrogen in the organic compound is

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Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

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In Carius method of estimation of halogen,

0.172 g

of an organic compound showed presence of

0.08 g

of bromine. Which of these is the correct structure of the compound ?

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Which of the following is a FALSE statement?

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For the estimation of nitrogen,

1.4 g

of an organic compound was digested by the Kjeldahl method and the evolved ammonia was absorbed in

60 ml

\frac{M}{10}

sulphuric acid. The unreacted acid required

20 ml

\frac{M}{10}

sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

An organic compound weighing

0.15 g

gave on Carius estimation,

0.12 g

AgBr

. The percentage of

Br

in the compound will be close to

(

At. Mass

Ag = 108, Br = 80)

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products?

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In Duma's method of estimation of nitrogen, $0.1840 g$ of an organic compound gave $30 mL$ of nitrogen collected at $287 K$ and $758 mm$ of $Hg$ pressure. The percentage composition of nitrogen in the compound is ______. (Round off to the Nearest Integer).

[Given : Aqueous tension at $287 K = 14 mm$ of $Hg$ ]

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Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation?

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An organic compound ‘A’ is oxidized with

N a_{2} O_{2}

followed by boiling with

H N O_{3} .

The resultant solution is then treated with ammonium molybdate to yield a yellow percipitate. Based on a above observation, the element present in the given compound is:

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

Complete combustion of

1.80 g

of an oxygen containing compound

(C_{x} H_{y} O_{z})

gave

2.64 g

{CO}_{2}

and

1.08 g

H_{2} O .

The percentage of oxygen in the organic compound is :

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In Duma's method for estimation of nitrogen,

0.25 g

of an organic compound gave

40 mL

of nitrogen collected at

300 K

temperature and

725 mm

pressure. If the aqueous tension at

300 K

25 mm

, the percentage of nitrogen in the compound is:

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The formula of a gaseous hydrocarbon which requires 6 times of its own volume of

O_{2}

for complete oxidation and produces

4

times its own volume of

{CO}_{2}

C_{x} H_{y} .

The value of

y

is ________.

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

Which of the following is used for the estimation of halogens in organic compounds?

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

Nitrogen can be estimated by Kjeldahl's method for which of the following compound?

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

0.8 g

of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be

42 %

, then.......

mL

1 M

H_{2} {SO}_{4}

would have been neutralized by the ammonia evolved during the analysis.

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

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Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

In the Kjeldahl's method for estimation of nitrogen present in soil sample, ammonia evolved from

0.75 g

of sample neutralized

10 m l

1 M H_{2} {S O}_{4}

The percentage of nitrogen in the soil is:

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

The ammonia evolved from

2 g

of a compound in Kjeldahl's estimation of nitrogen neutralizes

10 mL of 2 M H_{2} {SO}_{4}

solution. The weight percentage of nitrogen in the compound is:

HARD

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Quantitative Elemental Analysis of Organic Compounds.

1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10

H_{2} S O_{4}

solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is:

In Zeisel's method for the determination of methoxyl groups, a sample of 2.68 gm of a compound (A) gave 14.08 gm of AgI. If the molecular weight of compound (A) is 134, the number of (—OCH3) group(s) in the compound (A) is:

Important Questions on Organic Chemistry - Some Basic Principles and Techniques

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In Zeisel's method for the determination of methoxyl groups, a sample of 2.68 gm of a compound (A) gave 14.08 gm of AgI. If the molecular weight of compound (A) is 134, the number of (—OCH₃) group(s) in the compound (A) is: