The concentration of 69% nitric acid (by mass) in a sample with a density of 1.41 g / mL will be-

1. 15.44 mol/L

2. 17.14 mol/L

3. 20.06 mol/L

4. 12.26 mol/L

Subtopic:  Concentration Based Problem |
 63%
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The mass of ammonia produced when 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen is: 

1. 2338.11 g

2. 2428.57 g

3. 2712.24 g

4. 2180.56 g
 

Subtopic:  Limiting Reagent |
 70%
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The total number of electrons present in 1.4 g of dinitrogen gas are -

1. 6.023 × 1023 electrons

2. 8.416 × 1022 electrons

3. 4.214 × 1023 electrons

4. 3.927 × 1024 electrons

Subtopic:  Moles, Atoms & Electrons |
 60%
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The mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molars aqueous solution would be -

Molar mass(sodium acetate) = 82.0245 g/mol

1. 17.86g

2. 31.76g

3. 20.34g

4. 15.38g

Subtopic:  Moles, Atoms & Electrons |
 68%
From NCERT
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 The empirical formula of an oxide of iron, which has 69.9% iron and 30.1% oxygen by mass is -

1. FeO

2. Fe2O3

3. Fe3O4

4. Fe3O2

Subtopic:  Empirical & Molecular Formula |
 62%
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If 1010 wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -

1. 1.91 × 106 years
2. 2.31 × 104 years
3. 3.84 × 106 years
4. 1.91 × 105 years

Subtopic:  Moles, Atoms & Electrons |
 56%
From NCERT
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A reading on Fahrenheit scale is 200°F. The same reading on celsius scale will be :

1. 40°C 2. 94°C
3. 93°C 4. 30°C
Subtopic:  Introduction |
 67%
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If 500 mL of a 5 M solution is diluted to 1500 mL, the molarity of the resultant solution is: 

1. 1.5 M

2. 1.66 M

3. 0.017 M

4. 1.59 M

Subtopic:  Concentration Based Problem |
 82%
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The mass percent of carbon in carbon dioxide is : 

1. 0.034% 2. 27.27%
3. 3.4% 4. 28.7%
Subtopic:  Concentration Based Problem |
 77%
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The incorrect statement among the following is:

1. A molecule of a compound has atoms of different elements.
2. A compound can not be separated into its constituent elements by the physical method of separation.
3. A compound retains the physical properties of its constituent elements.
4. The ratio of atoms of different elements in a compound is fixed.
Subtopic:  Introduction |
 60%
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