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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 |
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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 |
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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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The total number of valence electrons in 4.2g of ${\mathrm{N}}_{3}^{-}$ 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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In the Haber process, 30 L of dihydrogen and 30 L of dinitrogen were taken for the reaction, which yielded only 50% of the expected product. The composition of the gaseous mixture under the said conditions in the end is:

1. 20 L ammonia, 10 L nitrogen, 30 L hydrogen

2. 20 L ammonia, 25 L nitrogen, 15 L hydrogen

3. 20 L ammonia, 20 L nitrogen, 20 L hydrogen

4. 10 L ammonia, 25 L nitrogen, 15 L hydrogen

Subtopic:  Limiting Reagent |
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What is the approximate number of atoms present in 4.25 grams of NH3?

1. 4 x 1023

2. 2 x 1023

3. 1 x 1023

4. 6 x 1023

Subtopic:  Moles, Atoms & Electrons |
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In the reaction, 4NH3(g)+ 5O2(g) $\to$4NO(g) +6H2O(l)

When 1 mole of ammonia and 1 mole of O2  reacts to completion, then:

 1 1.0 mole of H2O is produced. 2 1.0 mole of NO will be produced. 3 All the oxygen will be consumed. 4 All the ammonia will be consumed.

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