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In the quantitative analysis of carbon and hydrogen in an organic compound, the organic compound is burnt in the presence of excess of oxygen and copper(II) oxide to form carbon dioxide and (water / hydrogen peroxide) respectively.

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Important Questions on Organic Chemistry: Some Basic Principles and Techniques

HARD

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative 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:

HARD

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

An organic compound on combustion gives

0.22 g of {CO}_{2}, and 0.126 g of H_{2} O

. If the percentage of

C

in given organic compound is

40 %

, the percentage of hydrogen will be?

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Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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 $Hg$ ]

EASY

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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:

EASY

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

0.0833

mole of a carbohydrate of empirical formula

{CH}_{2} O

contains

1.00 g

of hydrogen. The molecular formula of the carbohydrate is

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Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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

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Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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

EASY

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

120 g

of an organic compound which contains only carbon and hydrogen on complete combustion gives

330 g

{CO}_{2}

and

270 g

of water. The percentage of carbon and hydrogen in the organic compound are respectively

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

When

0.01 mol

of an organic compound containing

60 %

carbon was burnt completely,

4.4 g

{CO}_{2}

was produced. The molar mass of compound is _____

{gmol}^{- 1}

(Nearest integer)

EASY

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative 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:

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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 ________.

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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

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Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

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:

HARD

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative 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

EASY

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

Which of the following is a FALSE statement?

HARD

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative 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)

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

When a hydrocarbon

A

undergoes complete combustion it requires

11

equivalents of oxygen and produces

4

equivalents of water. What is the molecular formula of

A

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative Analysis of Organic Compounds

64 g

of an organic compound contains

24 g

of carbon,

8 g

of hydrogen and the rest oxygen. The empirical formula of the compound is

HARD

Chemistry>Organic Chemistry>Organic Chemistry: Some Basic Principles and Techniques>Quantitative 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 :

In the quantitative analysis of carbon and hydrogen in an organic compound, the organic compound is burnt in the presence of excess of oxygen and copper(II) oxide to form carbon dioxide and (water / hydrogen peroxide) respectively.

Important Questions on Organic Chemistry: Some Basic Principles and Techniques

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