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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A gaseous mixture of H2 and CO2 gas contains 66 mass % of CO2. The vapour density of the mixture is:

1.  6.1

2.  5.4

3.  2.7

4.  10.8

Subtopic:  Equation Based Problem |
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What volume of 75% alcohol by weight (d=0.80g/cm3) must be used to prepare 150 cm3 of 30% alcohol by weight (d=0.90 g/cm3)?

1. 67.5 mL

2. 56.25 mL

3. 44.44 mL

4. None of these

Subtopic:  Concentration Based Problem |
 57%
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Average atomic mass of magnesium is 24.31 a.m.u. This magnesium is compound of 79 mole% of Mg24 and remaining 21 mole % of Mg25 and Mg26. Calculate mole% of Mg26.

1.  10

2.  11

3.  15

4.  16

Subtopic:  Moles, Atoms & Electrons |
 59%
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A mixture of NH4NO3 and (NH4)2HPO4 contain 30.40% mass per cent of nitrogen. What is the mass ratio of the two components in the mixture?

1. 2 : 1

2. 1 : 2

3. 3 : 4

4. 4 : 1

Subtopic:  Equation Based Problem |
 51%
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