Concentrated nitric acid is 70% HNO3. The amount of concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3 would be:

1. 90.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3

Subtopic:  Concentration Based Problem |
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The mole fraction of the solute in a 1.00 molal aqueous solution is: 

1. 0.00177 2. 0.0344
3. 0.0177 4. 0.1770
Subtopic:  Concentration Based Problem |
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6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of the solution is:

1. 0.02M 2. 0.01M
3. 0.001M 4. 0.1M
Subtopic:  Moles, Atoms & Electrons |
 70%
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Which of The following has a maximum number of molecules?

1. 7g N

2. 2g H

3. 16g NO

4. 16g O

Subtopic:  Moles, Atoms & Electrons |
 70%
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Calculate the number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions.

1. 0.0093 mole

2. 2.10 moles

3. 0.186 mole

4. 0.21 mole

Subtopic:  Moles, Atoms & Electrons |
 54%
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How much oxygen gas (O2) at standard temperature (0°C) and pressure (1 atm) is required to completely combust 1 liter of propane gas (C3H8) under the same conditions?

1. 7L 
2. 6L
3. 5L
4. 10L

Subtopic:  Equation Based Problem |
 73%
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1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. The left-out reactant and its quantity are

(At. weight of Mg = 24, O=16)

1. Mg, 0.16g 2. O2, 0.16g
3. Mg, 0.44g 4. O2, 0.28g

Subtopic:  Equation Based Problem |
 51%
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Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is

1. 1.568 x 10

2. 15.68

3. 2.168 x 10

4. 1.568 x 10

Subtopic:  Moles, Atoms & Electrons |
 51%
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The total number of valence electrons in 4.2g of N3- ion is (NA is the Avogadro's number)

1. 2.1NA 

2. 4.2NA 

3. 1.6NA 

4. 3.2NA 

Subtopic:  Moles, Atoms & Electrons |
 56%
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When 22.4L of H2(g) is mixed with 11.2L of Cl2(g) each at STP, the moles of HCl(g) formed is equal to 

1. 1 mole of HCl(g)

2. 2 moles of HCl(g)

3. 0.5 mole of HCl(g)

4. 1.5 moles of  HCl(g)

Subtopic:  Moles, Atoms & Electrons |
 59%
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