The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be 14 g. The % purity of NaCl solution would be:

1.  95%

2.  85%

3.  75%

4.  65%

Subtopic:  Equation Based Problem |
 58%
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25.4 g of I2 and 14.2 g  of Cl2 are made to react completely to yield a mixture of ICI and ICI3. The mole of ICI and ICI3 formed, is respectively -

1. 0.5, 0.2

2. 0.1, 0.1

3. 0.1, 0.3

4. 0.3, 0.4

Subtopic:  Limiting Reagent | Equation Based Problem |
 72%
From NCERT
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The vapour density of a mixture containing NO2 and N2O4  is 38.3. The mole of NO2 in a 100 g mixture is -

[Vapour density = (Molar mass / 2)]

1. 0.437

2. 0.347

3. 0.557

4. 0.663

Subtopic:  Equation Based Problem |
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Copper forms two oxides. For the same amount of copper, twice as much oxygen was used to form first oxide than to form second one. What is the ratio of the valencies of copper in first and second oxides?

1. 2:5

2. 1:6

3. 2:1

4. 1:2

Subtopic:  Equivalent Concept |
 63%
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5 mL of a gaseous hydrocarbon was exposed to 30 mL of O2. The resultant gas, on cooling is found to measure 25 mL of which 10 mL is absorbed by NaOH and the remainder by pyrogallol. Determine molecular formula of hydrocarbon. All measurements are made at constant room temperature.

1. CH4

2. C2H2

3. C3H4

4.C2H4

Subtopic:  Limiting Reagent |
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60 mL of a mixture of nitrous oxide and nitric oxide was exploded with excess of hydrogen. If 38 mL of N2 was formed, calculate the volume of each gas in the mixture. All measurements are made at constant P and T.

1.20 ml +30 ml

2. 44 ml + 16 ml

3. 10 ml+40 ml

4 .25 ml +25 ml

Subtopic:  Limiting Reagent |
 69%
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2.0 g sample containing Na2CO3and NaHCO3 loses 0.248 g when heated to 300°C, the temperature at which NaHCO3 decomposes to Na2CO3CO2 and H2O. What is the % of Na2CO3 in mixture?

1.66.5

2.50.6

3.60.5

4.6.65

Subtopic:  Equation Based Problem |
 51%
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A sample of CaCO3 and MgCO3 weighed 2.21 g is ignited to constant mass of 1.152 g. What is the composition of mixture? Also calculate the volume of CO2 evolved at 0°C and 76 cm of pressure.

 

1.640 ml

2.540 ml

3.500 ml

4.600 ml

Subtopic:  Moles, Atoms & Electrons |
 68%
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The average molar mass of the mixture of CH4 and C2H4 present in the mole ratio of a:b is 20 g mol-1. When the mole ratio is reversed, the molar mass of the mixture will be:

1. 24 gram 2. 42 gram
3. 20 gram 4. 15 gram
Subtopic:  Moles, Atoms & Electrons |
From NCERT
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Vapour density of a volatile substance is 4 CH4=1. Its molar mass would be:

1.  8

2.  2

3.  64

4.  128

Subtopic:  Moles, Atoms & Electrons |
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