The correct match between item I and item II is Item I (Compound) Item II (Reagent) a . Lysine p . 1 - naphthol b . Furfural q . Ninhydrin c . Benzyl alcohol r . KMnO 4 d . Styrene s . Ceric ammonium nitrate

a → q , b → p , c → s , d → r

a → q , b → r , c → s , d → p

a → r , b → p , c → q , d → s

a → q , b → p , c → r , d → s

EASY

Earn 100

Anthracene can be purified by

50% studentsanswered this correctly

Important Questions on Elements, Compounds and Mixtures

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Acetic acid reacts with sodium metal at room temperature to produce

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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 ?

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Which of the following is a FALSE statement?

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

In the following reaction

Question Image

The major product is

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

The reddish brown precipitate formed in the Fehling's test for aldehydes (RCHO) is due to the formation of

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Phenol can be distinguished from ethanol by the reagent

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Question Image

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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 ________.

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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 :

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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:

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

The correct match between item

I

and item

II

Item $I$ (Compound)		Item $II$ (Reagent)
$a .$	Lysine	$p .$	$1 -$ naphthol
$b .$	Furfural	$q .$	Ninhydrin
$c .$	Benzyl alcohol	$r .$	${KMnO}_{4}$
$d .$	Styrene	$s .$	Ceric ammonium nitrate

Anthracene can be purified by

Important Questions on Elements, Compounds and Mixtures

Learn and Prepare for any exam you want !