The maximum number of water molecules among the following is:

1. 18 mL of water 
2. 0.18 g of water 
3. 0.00224 L water vapours at 1 atm and 273 K
4. 10-3 mol of water 

Subtopic:  Moles, Atoms & Electrons |
 57%
From NCERT
NEET - 2018
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Calculate  the mole fraction of the solute in a 1.00 m aqueous solution.

1. 0.177
2. 0.771
3. 0.0534
4. 0.0177

Subtopic:  Concentration Based Problem |
 67%
From NCERT
NEET - 2015
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A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). The molar ratio of the two gases in the mixture will be:

1. 1:4 2. 4:1
3. 16:1 4. 2:1
Subtopic:  Moles, Atoms & Electrons |
 70%
From NCERT
NEET - 2015
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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 |
 77%
From NCERT
AIPMT - 2013
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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 |
 66%
From NCERT
AIPMT - 2008
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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 |
 78%
From NCERT
AIPMT - 2008
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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 |
 58%
From NCERT
AIPMT - 2008
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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 |
 63%
From NCERT
AIPMT - 2007
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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%
From NCERT
NEET - 2019
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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 |
From NCERT
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