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The colour of calcium nitrate salt is dirty yellow.

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Important Questions on Qualitative Analysis (OoS)

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

The hottest region of Bunsen flame shown in the figure below is:

Question Image

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Match List-I with List-II and select the correct answer using the codes given below.

	List I		List II
A.	Rinmann's green	1.	$Cu {({CH}_{3} COO)}_{2} \cdot Cu {(OH)}_{2}$
B.	Verdigris	2.	${HgCl}_{2}$
C.	Corrosive sublimate	3.	${CoZnO}_{2}$
D.	Lithopone	4.	$ZnS + {BaSO}_{4}$

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

The ion most difficult to remove as precipitate is

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Peroxides are basic in nature and they form hydrogen peroxides on treatment with acid. What volume of

0.5 M H_{2} {SO}_{4}

solution is required to neutralise a solution containing

7.2 g

{CaO}_{2}

HARD

Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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:

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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The colour of ppt. $A, B$ and $C$ respectively is

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen, because

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

In the Dumas method, which gas is collected in the nitrometer?

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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

)

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

A mixture contains four solid organic compounds

A, B, C

and

D

. On heating, only

C

changes from solid to vapour state. The compound

(C)

can be separated from the mixture by

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Which of the following involves qualitative analysis

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

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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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Water insoluble bases such as

CaO, ZnO

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

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Chemistry>Inorganic Chemistry>Qualitative Analysis (OoS)>Preliminary Test for Radicals

Qualitative test of halogens in an organic compound is made by

The colour of calcium nitrate salt is dirty yellow.

Important Questions on Qualitative Analysis (OoS)

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