# The weight of 70 % HNO3 concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3  is: 1. 90.0 g conc. HNO3 2. 70.0 g conc. HNO3 3. 54.0 g conc. HNO3 4. 45.0 g conc. HNO3

Subtopic:  Concentration Based Problem |
64%
From NCERT
AIPMT - 2013
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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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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 |
82%
From NCERT
AIPMT - 2011
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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, $C{O}_{3}^{2-}$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 |
71%
From NCERT
AIPMT - 2010
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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. $6.026×{10}^{22}$

2. $1.806×{10}^{23}$

3. $3.600×{10}^{23}$

4. $1.800×{10}^{22}$

Subtopic:  Moles, Atoms & Electrons |
74%
From NCERT
AIPMT - 2010
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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 |
74%
From NCERT
AIPMT - 2009
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The volume occupied by one water molecule (density = 1 g cm-3) is:

1. $9.0×{10}^{-23}$  ${\mathrm{cm}}^{3}$

2. $6.023×{10}^{-23}$  ${\mathrm{cm}}^{3}$

3. $3.0×{10}^{-23}$  ${\mathrm{cm}}^{3}$

4. $5.5×{10}^{-23}$  ${\mathrm{cm}}^{3}$

Subtopic:  Concentration Based Problem |
65%
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 |
77%
From NCERT
AIPMT - 2008
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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 |
78%
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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