To produce 20 moles of ammonia via Haber's process, how many moles of hydrogen molecules are required?

1. 40 mol 2. 10 mol
3. 20 mol 4. 30 mol

Subtopic:  Limiting Reagent | Equation Based Problem |
 79%
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What is the number of moles of O-atom in 126 amu of HNO3?

1.  2

2.  2NA

3.  6

4.  6NA

Subtopic:  Moles, Atoms & Electrons |
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Cisplatin, an anticancer drug, has the molecular formula PtNH32 Cl2. What is the mass (in gram) of one molecule? (Atomic weights : Pt=195, H=1.0, N=14, Cl=35.5)

1.  4.98×10-21

2.  4.98×10-22

3.  6.55×10-21

4.  3.85×10-22

Subtopic:  Moles, Atoms & Electrons |
 72%
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The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2 L oxygen at 1 atm and 273 K will be:

1. 14.4 gm

2. 96 gm

3. 640 gm

4. 64 gm

Subtopic:  Moles, Atoms & Electrons |
 61%
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A silver coin weighing 11.34 g was dissolved in nitric acid. When sodium chloride was added to the solution all the silver (present as AgNO3) was precipitated as silver chloride. The weight of the precipitated silver chloride was 14.35 g. Calculate the percentage of silver in the coin.

1. 4.8%

2. 95.2%

3. 90%

4. 80%

Subtopic:  Equation Based Problem |
 69%
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Rearrange the following (I to IV) in the order of increasing masses:

(I)   0.5 mole of O3
(II)  0.5 gm atom of oxygen
(III) 3.011×1023 molecules of O2
(IV)  5.6 liter of CO2 at STP

1. II<IV<III<I 2. II<I<IV<III
3. IV<II<III<I 4. I<II<III<IV
Subtopic:  Moles, Atoms & Electrons |
 66%
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It is known that atom contains protons, neutrons and electrons. If the mass of neutron is assumed to half of its original value whereas that of proton is assumed to be twice of its original value then the atomic mass of C614 will be:

1.  same

2.  14.28% less

3.  14.28% more

4.  28.56% less

Subtopic:  Moles, Atoms & Electrons |
 60%
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Nitric acid can be produced NH3 in three steps process

(I) 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g)
(II) 2NO(g) + O2(g)2NO2(g)
(III) 3NO2(g) + H2O(l)  2HNO3(aq) + NO(g)

percent yield Ist, IInd and IIIrd are respectively 50%, 60% and 80% respectively then what volume of NH3(g) at 1 atm and 0°C required to produces 1575 g of HNO3

1. 156.25

2. 350 L

3. 3500 L

4. None of these

Subtopic:  Equation Based Problem |
 53%
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Density of dry air containing only N2 and O2 is 1.15 g/L at 740 mm and 300 K. What is % composition of N2 by weight in the air?

1.  78%

2.  75.5%

3.  70.02%

4.  72.75%

Subtopic:  Equation Based Problem |
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In preparation of iron from haematite (Fe2O3)by the reaction with carbon
                          Fe2O3 + C  Fe + CO2
How much 80% pure iron could be produced from 120 kg of 90% pure Fe2O3 ?

1. 94.5 kg

2. 60.48 kg

3. 116.66 kg

4. 120 kg

Subtopic:  Equation Based Problem |
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