Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 10

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Question 1
4 / -1

2.6 g of a mixture of calcium carbonate and magnesium carbonate is strongly heated to constant weight of 1.3 g. The atomic weights of calcium and magnesium are 40 and 24 respectively. State which of the following weights expresses the weight of calcium carbonate in the original mixture?

A
980 mg

B
400 mg

C
1.75 g

D
0.74 g

Solution
Question 2
4 / -1

If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K = 39):

A
153.12 g of KClO₃

B
122.5 g of KClO₃

C
245 g of KClO₃

D
98.0 g of KCIO₃

Solution
Question 3
4 / -1

3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water. 20 ml of this solution requires 18 ml of potassium permanganate during titration for complete oxidation. The weight of KMnO₄ present in one litre of the solution of

A
34.76 g

B
12.38 g

C
1.238 g

D
3.476 g

Solution
Question 4
4 / -1

What volume of hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron tri chloride by hydrogen ?

A
67.2 L

B
44.8L

C
22.4 L

D
89.6 L

Solution
Question 5
4 / -1

A
31.6

B
52.7

C
7.0

D
158.0

Solution
Question 6
4 / -1

The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

A
XY

B
X₂Y

C
XY₃

D
X₂Y₃

Solution
Question 7
4 / -1

A
20 ml of 0.5 M oxalic acid

B
20 ml of 0.1 M oxalic acid

C
50 ml of 0.5 M oxalic acid

D
50 ml of 0.1 M oxalic acid

Solution
Question 8
4 / -1

If an iodized salt contains 1% of KI and a person takes 2g of the salt every day, the iodide ions going into his body everyday would be approx

A

B

C

D

Solution
Question 9
4 / -1

If the density of water is 1 g cm^-3 then the volume occupied by one molecule of water is approximately

A
18 cm³

B
22400 cm³

C

D

Solution
Question 10
4 / -1

Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be

A
45.3 g

B
4.53 g

C
0.453 g

D
453 g

Solution