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Important Questions on Analytical Chemistry

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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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Qualitative test of halogens in an organic compound is made by

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0.248 g

of an organic compound was heated in carius tube with conc.

{HNO}_{3}

. Produced

H_{3} {PO}_{4}

was precipitated as

Mg ({NH}_{4}) {PO}_{4}

, which formed

0.444 g {Mg}_{2} P_{2} O_{7}

on ignition. What percentage of '

P

' is present in compound? (At. mass of

Mg = 24, P = 31

)

HARD

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A white crystalline substance dissolves in water. On passing

H_{2} S

in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot

{HNO}_{3}

. On adding a few drops of concentrated

H_{2} {SO}_{4}

, a white precipitate is obtained which is soluble in ammonium acetate. The white precipitate is that of:

EASY

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Which of the following involves qualitative analysis

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Which one of the following property of matter is Not quantitative in nature?

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Most acidic species among the following is

HARD

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23.2 g

of an organic compound having molecular formula

C_{n} H_{2 n + 2}

is burnt in excess of

O_{2} (g)

, initially taken in a

44.82 L

steel vessel. Before the reaction, the gaseous mixture was at

273 K

with a pressure of

2 atm

. After complete combustion and loss of a considerable amount of heat, the mixture of product and excess of

O_{2}

had a temperature of

546 K

and

4.6 atm

pressure. The formula of the compound is

HARD

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An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives

N H_{3}

along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is

EASY

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White precipitate of

AgCl

turns to greyish or black when :

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Identity the salt $Q$ from the observation given below:

When dilute $H C l$ is added to a salt $Q$ , a brisk effervescence is produced and the gas turns lime water milky. When $N H_{4} O H$ solution is added to the above mixture (after adding dilute $H C l$ ), it produces a white precipitate which is soluble in excess $N H_{4} O H$ solution.

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Analytical chemistry is very much important in our life because it has applications in

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The branch of chemistry which deals with study of separation, identification, and quantitative determination of the composition of different substances is called as _____

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A sample of

0.4 g

of chloroplatinate of a monoacidic base on ignition gave

0.125 g

of Pt. The molecular mass of organic base is

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An organic compound contains

N

S

C

and

H

. Which of these is not used in quantitative detection of the organic compound?

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The branch of chemistry, which deals with the separation, the identification and the quantitative determination of the composition of different substances, is called _____ chemistry.

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Water insoluble bases such as

CaO, ZnO

, etc. are known as _____. (alkalis / non-alkalis)

HARD

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Determine the value of percentage of nitrogen in the compound, when in Duma's method for the estimation of nitrogen

0.30 g

of organic compound gave

50 {cm}^{3}

of nitrogen gas collected at

300 K and 715 nm

pressure. Aqueous tension at

300 K = 15 mm of Hg

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Match the following:

$i$ .	Biological systems	$a$ .	EDTA
$ii$ .	Analytical chemistry	$b$ .	cis-platin
$iii$ .	Medicinal chemistry	$c$ .	Haemoglobin

HARD

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On performing the flame test salt

' X'

produces a lilac / violet coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution. Identify

' X'

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Important Questions on Analytical Chemistry

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