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Following Kjeldahl's method, $1 g$ of organic compound released ammonia, that neutralised $10 mL$ of $2 {MH}_{2} {SO}_{4} .$ The percentage of nitrogen in the compound is _______ $% .$

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Important Questions on Purification and Characterisation of Organic Compounds

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

HARD

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

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Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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

HARD

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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:

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

Which of the following is a FALSE statement?

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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 ?

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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>Purification and Characterisation of Organic Compounds>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:

HARD

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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 :

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative 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:

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

HARD

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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)

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

EASY

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

In Dumas method for the estimation of

N_{2}

, the sample is heated with copper oxide and the gas evolved is passed over:

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

In Carius method of estimation of halogen.

0.45 g

of an organic compound gave

0.36 g

AgBr

. Find out the percentage of bromine in the compound.
(Molar masses :

AgBr = 188 g {mol}^{- 1} : Br = 80 g {mol}^{- 1}

)

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>Quantitative Analysis of Organic Compounds

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

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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

MEDIUM

Chemistry>Organic Chemistry>Purification and Characterisation of Organic Compounds>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:

Following Kjeldahl's method, 1 g of organic compound released ammonia, that neutralised 10 mL of 2MH2SO4. The percentage of nitrogen in the compound is _______ %.

Important Questions on Purification and Characterisation of Organic Compounds

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Following Kjeldahl's method, $1 g$ of organic compound released ammonia, that neutralised $10 mL$ of $2 {MH}_{2} {SO}_{4} .$ The percentage of nitrogen in the compound is _______ $% .$