# The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO4) is: 1. 54.00 2. 39.81 3. 63.50 4. 159.50

Subtopic:  Moles, Atoms & Electrons |
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In an iron oxide, the mass percent of iron and oxygen are 69.9 and 30.1, respectively. The empirical formula of the oxide of iron will be:

1. Fe3O2

2. Fe2O2

3. Fe2O3

4. Fe3O4

Subtopic:  Empirical & Molecular Formula |
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The average atomic mass of chlorine using the following data would be:

 Isotope % Natural Abundance Molar Mass 35Cl 75.77 34.9689 37Cl 24.23 36.9659

1. 38.4527 u

2. 37.4527 u

3. 36.4527 u

4. 35.4527 u

Subtopic:  Empirical & Molecular Formula |
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The number of moles of hydrogen atoms present in 3 moles of ethane (C2H6), will be-

1. 18.069 × 1023

2. 1.8 × 1023

3. 18

4. 6 × 1023

Subtopic:  Moles, Atoms & Electrons |
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20 g of sugar is dissolved in enough water to make a final volume of 2L. The concentration of sugar (C12H22O11) in mol L–1  will be:

1. 0.29 mol/L

2. 0.029 mol/L

3. 0.35 mol/L

4. 0.032 mol/L

Subtopic:  Concentration Based Problem |
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If the density of methanol is 0.793 kg L–1, the volume needed for making 2.5 L of its 0.25 M solution would be:

1. 22.25 mL

2. 24.78 mL

3. 25.22 mL

4. 22.52 mL

Subtopic:  Concentration Based Problem |
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If the mass of air at sea level is 1034 g cm–2, pressure in pascal will be:

1. 1.01332 × 105 Pa

2. 1.01332 × 106 Pa

3. 1.01332 × 10Pa

4. 1.01332 × 108 Pa

Subtopic:  Introduction |
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The SI unit of mass is:

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

Subtopic:  Introduction |
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A significant figure is defined as :

 1 The total number of digits in a number, including the last digit that represents the uncertainty of the result. 2 The total number of digits in a number, excluding the last digit, which represents the uncertainty of the result. 3 The total number of digits in a number including the last digit that represents the certainty of the result. 4 The total number of last digits that represents the uncertainty of the result.

Subtopic:  Introduction |
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The chloroform contamination level in water is 15 ppm (by mass of chloroform). The molality of chloroform in the water sample would be:

1. 3.25 × 10-4

2. 1.5 × 10-3

3.  7.5 × 10-3

4. 1.25 × 10-4

Subtopic:  Concentration Based Problem |
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