6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of the solution is:
1. 0.01 M
2. 0.001 M
3. 0.1 M
4. 0.02 M

Subtopic:  Concentration Based Problem |
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Mole fraction of solute in a 1.00 molal aqueous solution is
1.  0.0177
2.  0.0344
3.  1.770
4.  0.1770

Subtopic:  Concentration Based Problem |
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25.3 g of sodium carbonate, Na2CO3 , is dissolved in enough water to make 250 mL of a solution. If sodium carbonate completely dissociates, the molar concentrations of sodium ion, Na+ and carbonate ion, CO32-are respectively-
(molar mass of Na2CO3 = 106g mol-1)
1. 0.955 M and 1.910 M
2. 1.910 M and 0.955 M
3. 1.90 M and 1.910 M
4. 0.477 M and 0.477 M

Subtopic:  Concentration Based Problem |
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The number of atoms in 0.1 mole of a triatomic gas is (NA= 6.02 x 1023 mol-1)

1. 6.026×1022

2. 1.806×1023

3. 3.600×1023

4. 1.800×1022

Subtopic:  Moles, Atoms & Electrons |
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10 g of hydrogen and 64 of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:

1. 2 mol

2. 3 mol

3. 4 mol

4. 1 mol

Subtopic:  Limiting Reagent |
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The volume occupied by one water molecule (density = 1 g cm-3) is

1.  9.0×10-23  cm3

2.  6.023×10-23  cm3

3.  3.0×10-23  cm3

4.  5.5×10-23  cm3

Subtopic:  Concentration Based Problem |
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The volume of oxygen gas (O2) needed to completely burn 1 L of propane gas (C3H8)  (both O& propane measured at 0°C and 1 atm) will be:
1.  7 L
2.  6 L
3.  5 L
4.  10 L

Subtopic:  Equation Based Problem |
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An organic compound contains carbon, hydrogen, and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

1. CH3O

2. CH2O

3. CHO

4. CH4O

Subtopic:  Empirical & Molecular Formula |
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The moles of lead (II) chloride that will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl are

1. 0.044
2. 0.333
3. 0.011
4. 0.029

Subtopic:  Limiting Reagent |
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Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL-1 . The volume of acid required to make one litre of 0.1 M H2SO4 solution is:

1. 11.10 mL

2. 16.65 mL

3. 22.20 mL

4. 5.55 mL

Subtopic:  Concentration Based Problem |
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