Analytical Test

Result

Analytical Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

A mixture of salts (Na₂SO₃ + K₂Cr₂O₇ ) in a test tube is treated with dil. H₂SO₄ and resulting gas is passed through lime water. Which of the following observations is correct about this test?

A
Solution in test tube becomes green and lime water turns milky

B
Solution in test tube is colourless and lime water turns milky

C
Solution in test tube becomes green and lime water remains clear

D
Solution in test tube remains clear and lime water also remains clear
Question 2
4 / -1

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H₂S in dilute mineral acid medium. However, it gave a precipitate (R) with H₂S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H₂O₂ in an aqueous NaOH medium.
The precipitate P contains

A
Pb²⁺

B

C
Ag⁺

D
Hg²⁺
Question 3
4 / -1

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H₂S in dilute mineral acid medium. However, it gave a precipitate (R) with H₂S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H₂O₂ in an aqueous NaOH medium.
The coloured solution S contains

A
Fe₂(SO₄)₂

B
CuSO₄

C
ZnSO₄

D
Na₂CrO₄
Question 4
4 / -1

If Fe³⁺ and Cr³⁺ both are present in group III of qualitative analysis, then distinction can be made by

A
addition of NH₄OH in presence of NH₄Cl when only Fe(OH)₃ is precipitated

B
addition of NH₄OH in presence of NH₄Cl when Cr(OH)₃ and Fe(OH)₃ both are precipitated and on adding Br₂, water and NaOH, Cr(OH)₃ dissolves

C
precipitate of Cr(OH)₃ and Fe(OH)₃ as obtained in (b) are treated with conc. HCl when only Fe(OH)₃ dissolves

D
Both (2) and (3) are correct

Solution
Question 5
4 / -1

In the precipitation of the iron group in qualititative analysis, ammonium chloride is added before adding ammonium hydroxide to

A
Decrease concentration of OH^– ions

B
Prevent interference by phosphate ions

C
Increase concentration of Cl^– ions

D
Question 6
4 / -1

A precipitate of…..would be obtained when HCl is added to a solution of stannous sulphide (SnS) in yellow ammonium sulphide

A
SnS

B
SnS₂

C
Sn₂S₃

D
(NH₄)₂SnS₂

Solution
Question 7
4 / -1

The acidic solution of a salt produced a deep blue colour with starch iodide solution. The salt may be

A
Chloride

B
Nitrite

C
Acetate

D
Bromide

Solution
Question 8
4 / -1

Concentrated nitric acid is added before pro-ceeding to test for group III members. This is to

A
Oxidise any remaing H₂S

B
Convert ferrous ion into ferric ion

C
Form nitrates which give granular precipitates

D
Increase ionisation of ammonium hydroxide

Solution
Question 9
4 / -1

Which one of the following nitrate when heated gives off a gas or a mixture of gases which cannot relight a glowing splinter ?

A
Sodium nitrate

B
Ammonium nitrate

C
Lead nitrate

D
Potassium nitrate
Question 10
4 / -1

When a mixture of solid NaCl, solid K₂Cr₂O₇ is heated with conc. H₂SO₄, orange red vapours are obtained. These are of the compound

A
Chromous chloride

B
Chromyl chloride

C
Chromic chloride

D
Chromic sulphate

Solution