How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.

1. 45.0 g conc. HNO3

2. 90.0 g conc. HNO3

3. 70.0 g conc. HNO3

4. 54.0 g conc. HNO3

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

1. 0.0177

2. 0.0344

3. 1.7700

4. 0.1770

Subtopic:  Moles, Atoms & Electrons |
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6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of solution is 

1. 0.02M

2. 0.01M

3. 0.001M

4. 0.1M

Subtopic:  Moles, Atoms & Electrons |
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Which has the maximum number of molecules?

1. 7g N

2. 2g H

3. 16g NO

4. 16g O

Subtopic:  Moles, Atoms & Electrons |
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The number of moles of KMnO4 reduced by one mole of KI in an alkaline medium is 

1. one fifth 

2. five

3. one

4. two

Subtopic:  Equation Based Problem |
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The number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions, is 

1. 0.0093 mole

2. 2.10 moles

3. 0.186 mole

4. 0.21 mole

Subtopic:  Moles, Atoms & Electrons |
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What volume of  oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

1. 7L 

2. 6L

3. 5L

4. 10L

Subtopic:  Equation Based Problem |
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1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

(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 |
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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 |
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Number of moles of MnO4- required to oxidise one mole of ferrous oxalate completely in acidic medium will be 

1. 0.6 mole

2. 0.4 mole

3. 7.5 moles

4. 0.2 mole

Subtopic:  Equation Based Problem |
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