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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The number of atoms in 4.25 g of NH3 is approximately

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) 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.

Subtopic:  Equation Based Problem |
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An element X has the following isotopic composition,

200X : 90%, 199X : 8.0%, 202X : 2.0%

The weighted average atomic mass of the naturally occurring element X is closest to: 

1. 201 u 2. 202 u
3. 199 u 4. 200 u
Subtopic:  Moles, Atoms & Electrons |
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0.24g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance?

(Density of H2 = 0.089)

1. 95.93

2. 59.93

3. 95.39

4. 5.993

Subtopic:  Moles, Atoms & Electrons |
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The hydrated salt, Na2SO4.nH2O, undergoes a 55% loss in mass on heating and becomes anhydrous. The value of n will be:

1. 5 2. 3
3. 7 4. 10
Subtopic:  Empirical & Molecular Formula |
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12 g of Mg (atomic mass = 24) will react completely with an acid to give:

1. One mole of H

2. Half mole of H2

3. One mole of O2

4. None of the above

Subtopic:  Equation Based Problem |
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The molality of a 15% (w/vol.) solution of H2SO4 of density 1.1g/cm3 is-

1. 1.2

2. 1.4

3. 1.8

4. 1.6

Subtopic:  Concentration Based Problem |
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H3PO4 is a tribasic acid and one of its salts is NaH2PO4. What volume of 1 M NaOH should be added to 12g NaH2PO4 (Molar mass 120) to exactly convert it into Na3PO4?

1. 100 mL

2. 300mL

3. 200mL

4. 80mL

Subtopic:  Equivalent Weight |
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