٢٠١٣/٨/١١ Analytical Chemistry & Numerical MCQ Test 3 | Makox MCQs

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Analytical Chemistry & Numerical MCQ Test 3

Analytical Chemistry & Numerical MCQ Test 3

1. On passing H S gas in a acidified solution of a salt a yellow precipitate is obtained which is soluble in yellow ammonium sulphide, the

solution contains.

(a) As

(b) Sb

(c) Cd

(d) Cu

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

(a) SnS

(b) SnS

2

+++

+++

++

++

2

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(c) Sn S

(d) (NH ) SnS

3. In the precipitation of the iron in qualitative analysis ammonium chloride is added before adding NH OH to

(a) Decrease concentration of OH ions

(b) Prevent interference by phosphate ions

(c) Increase concentration of Cl ions

(d) Increase concentration of NH ions

4. Al , Fe , Cr are grouped together for purposes of qualitative analysis because their

(a) Carbonates are insoluble in ammonia

(b) Hydroxides are insoluble in ammonia

(c) Sulphides are soluble in acids

(d) Electronic charge is the same

5. Which of the following can be used in place of NH Cl for the Precipitation of the third group radicals

(a) Ammonium nitrate

(b) Ammonium sulphate

2 2

4 2 2

4

–

–

4+

3+ 3+ 3+

4

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(c) Ammonium oxalate

(d) Sodium chloride

6. Conc. Nitric acid is added before proceeding to test for group III members. This is to

(a) Oxidise any remaining H S

(b) Form nitrate which gives granular ppt.

(c) Convert ferrous into ferric ions

(d) Increase ionization of NH OH

7. …..is formed when potassium iodide is heated with conc. H SO

(a) Hl

(b) l

(c) HlO

(d) KlO

8. What would you observe if you add with shaking excess of dilute NaOH soln., to an aqueous solution of aluminium chloride

(a) A permanent white ppt. is formed immediately

(b) No change at first but a white ppt. is formed on standing

2

4

2 4

2

3

3

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(c) A white ppt. is formed which later dissolve

(d) A green pt which turns red on standing in air

9. Group reagent for IVth group basic radicals is H S in the presence of

(a) HCl

(b) NaOH

(c) NH Cl

(d) NH Cl and NH OH

10. In the flame test a brick red colour is indicative of

(a) Na

(b) K

(c) Sr

(d) Ca

Answer Keys:

1. (a) 2. (b) 3. (a) 4. (c) 5. (a) 6. (c) 7. (b) 8. (c) 9. (d) 10. (c)

Related Pages:

2

4

4 4

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