Qualitative Analysis Test

Result

Qualitative Analysis Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

0.92 g of an organic compound was analysed by combustion method. The mass of the U-tube increased by 1.08 g. What is the percentage of hydrogen in the compound?

A
13.04%

B
52.17%

C
65.21%

D
11.30%

Solution

Increase in mass of U-tube = 1.08 g
Mass of water formed = 1.08 g
18gH₂0 = 2gH
Question 2
1 / -0

An organic compound gave 0.4655 g of CO₂ on complete combustion. If the mass of the compound taken was 0.2115 g, what is the percentage of C in it?

A
13.30%

B
26.67%

C
60.03%

D
28.80%

Solution

Mass of CO₂ formed = 0.4655 g
Mass of organic compound taken = 0.2115 g
Question 3
1 / -0

In Duma'smethod 0.52 g of an organic compound on combustion gave 68.6 mL N₂ at 27^oC and 76 mm pressure. What is the percentage of nitrogen in the compound?

A
12.22%

B
14.93%

C
15.84%

D
16.23%

Solution

V₁ = 68.6 mL, P₁ =. 756 mm, T₁ = 300 K V₂ = ?, P₂ = 760 mm, T₂ = 273 K

Percentage of nitrogen in organic compound
Question 4
1 / -0

In kjeldahl's method of estimation of nitrogen, nitrogen is quantitatively converted to ammonium sulphate. It is the treated with the standard solution of alkali. The nitrogen which is present is estimated as:

A
N₂gas

B
NO₂gas

C
NH₃gas

D
(NH₄)₂SO₄

Solution

When treated with standard solution of alkali nitrogen is liberated as NH₃ which is absorbed in H₂SO₄ to get percentage of nitrogen.
Question 5
1 / -0

In Carius method of estimation of halogen, 0.15 g of an organic compound gave 0.12 g of AgBr. What is the percentage of bromine in the compound?

A
68.08%

B
34.04%

C
42.1%

D
50%

Solution

Molar mass of AgBr = 108 + 80 = 188 g mol^-1
Percentage of Br₂=
Question 6
1 / -0

2.18 g of an organic compound containing sulphur produces 1.02g of BaSO₄. Thepercentage of sulphur in the compound is

A
7.26%

B
8.98%

C
10%

D
6.42%

Solution
Question 7
1 / -0

1.6 g of an organic compound gave 2.6 g of magnesium pyrophosphate. The percentage of phosphorus in the compound is

A
45.38%

B
54.38%

C
37.76%

D
19.02%

Solution
Question 8
1 / -0

Match the column I with column II in which formula for estimation of an element is given and mark the appropriate choice.

A
(A) → (v), (B) → (v) → (C) → (iv), (D) → (i), (E) → (iii)

B
(A) → (v), (B) → (iv) → (C) → (i), (D) → (iii), (E) → (ii)

C
(A) → (v), (B) → (iv), (C) → (ii), (D) → (i), (E) → (iii)

D
(A) → (iv), (B) → (iii), (C) → (i), (D) → (ii), (E) → (v)

Solution

(w₁ = weight of CO₂, w= weight of organic compound)

(V = volume of N₂ at STP, w = weight of organic compound)
Question 9
1 / -0

The percentage of oxygen in heavy water is

A
60

B
50

C
80

D
5.9

Solution

In D₂O percentage of deuterium

% of oxygen - 100 - 20 = 80%
Question 10
1 / -0

0.2 g of an organic compound contains C, H and O.On combustion, it yields 0.15 g CO₂ and 0.12 g H₂O.Ihe percentage of C, H and O respectively is

A
C = 15%, H = 20%, O = 65%

B
C = 10%, H = 8.2%, O = 81.8%

C
C = 12.2%, H = 8.8%, O = 79%

D
C = 20%, H = 6.66%, O = 73.34%

Solution

% of O = 100 - (20 + 6.66) = 73.34%