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 |
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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. 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 |
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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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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 |
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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 |
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The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)

1. 180 kg

2. 270 kg

3. 540 kg

4. 90 kg

Subtopic:  Equation Based Problem |
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