Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 15

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IMPORTANT

Earn 100

Why is it necessary to test for the acid radicals first with dil. $H_{2} {SO}_{4}$ and then with conc. $H_{2} {SO}_{4} ?$

Important Questions on Qualitative Analysis

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 26

On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 28

Which of the following anions are identified by dil.

HCl

:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 29

Two inorganic compounds

A

and

B

were heated in a dry test tube.

A

evolved a colourless gas which turned lead acetate paper black and

B

evolved a gas which turned lime water milky. The anions in

A

and B respectively are:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 31

A gas turns lime water milky and acidified

K_{2} {Cr}_{2} O_{7}

solution green then gas is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 32

A gas has smell like rotten egg and turns lead acetate paper black. The gas is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 33

Question Image

Anion $(X^{2 -})$ is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 34

The acidic solution of a salt produces blue colour with

KI

starch solution. The reaction indicates the presence of:

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Alpha Question Bank for Engineering: Chemistry>Chapter 22 - Qualitative Analysis>Exercise-1>Q 35

Sulphide ion reacts with

{Na}_{2} [Fe (CN)_{5} NO]

to form a purple coloured compound

(X) .

In this reaction oxidation state of iron.