# 0.33%  of iron (by weight) is present in hemoglobin (Molecular wt = 67200). The number of iron atom(s) in one molecule will be: 1.  1 2.  2 3.  3 4.  4

Subtopic:  Equation Based Problem |
71%
From NCERT
AIPMT - 1998
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$4N{H}_{3}$ $+$ $5{O}_{2}$ $\to$ $6{H}_{2}O$ $+$ $4NO$

When one mole ammonia and one mole oxygen are taken:
1. Oxygen is completely consumed
2. Ammonia is completely consumed
3. Both (1) and (2) are correct
4. None of the above options is correct

Subtopic:  Limiting Reagent |
67%
From NCERT
AIPMT - 1998
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The mole ratio of H2 and O2 gas is 8:1. The ratio of their weight will be:

1. 1 : 1
2. 2 : 1
3. 4 : 1
4. 1 : 2

Subtopic:  Moles, Atoms & Electrons |
73%
From NCERT
AIPMT - 1999
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A compound contains C, H, and O. If C = 40% and H = 6.67% and rest is oxygen, then the empirical formula of the compound will be:

1. $C{H}_{2}O$

2. $C{H}_{4}O$

3. $C{H}_{4}{O}_{2}$

4. CHO

Subtopic:  Empirical & Molecular Formula |
82%
From NCERT
AIPMT - 1999
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The maximum number of molecules is present in:

 1 5L of N2 gas at STP 2 0.5 g of H2 gas 3 10g of O2 gas 4 15 L of H2 gas at STP
Subtopic:  Moles, Atoms & Electrons |
68%
From NCERT
AIPMT - 2004
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The incorrect option for mole fraction(x) is:

1.  x < 1
2.  – 2 ≤ x ≤ 2
3.  0 ≤ x ≤ 1
4.  Always non-negative

Subtopic:  Concentration Based Problem |
64%
From NCERT
AIPMT - 1999
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The volume of CO2 obtained by the complete decomposition of 9.85 grams of BaCO3 is:

1. 2.24 lit.

2. 1.12 lit.

3. 0.84 lit.

4. 0.56 lit

Subtopic:  Equation Based Problem |
68%
From NCERT
AIPMT - 2000
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1 M, 2.5 litre NaOH solution is mixed with another 0.5 M and 3 litre NaOH solution.
The molarity of the resultant solution is:

 1 0.80 M 2 1.0 M 3 0.73 M 4 0.50 M
Subtopic:  Concentration Based Problem |
74%
From NCERT
AIPMT - 2002
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Which among the following has the maximum number of molecules?

1. 7 gm N2

2. 2 gm H2

3. 16 gm NO2

4. 16 gm O2

Subtopic:  Moles, Atoms & Electrons |
86%
From NCERT
AIPMT - 2002
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The percentages of C, H, and N in an organic compound are 40%, 13.3%, and 46.7% respectively.
The empirical formula of the compound is:

1. C3H13N3
2. CH2N
3. CH4N
4. CH6N

Subtopic:  Empirical & Molecular Formula |
72%
From NCERT
AIPMT - 2002
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