Percentage of C, H & N of a compound is given as follows:
C=40%, H=13.33%, N=46.67%
The empirical formula of the compound will be:

1. CH2N

2. C2H4N

3. CH4N

4. CH3N

Subtopic:  Empirical & Molecular Formula |
 76%
From NCERT
AIPMT - 1998
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The number of significant figures in the following numbers is:
 

(I). 161 cm
(II). 0.0161
(III). 1.61


1. 3, 3, 3
2. 3, 4, 3
3. 3, 2, 3
4. 3, 4, 4

Subtopic:  Introduction |
 73%
From NCERT
AIPMT - 1998
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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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4NH3 + 5O2  6H2O + 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. CH2O

2. CH4O

3. CH4O2

4. CHO

Subtopic:  Empirical & Molecular Formula |
 82%
From NCERT
AIPMT - 1999
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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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Find the molarity of liquid HCl if the density of liquid HCl is 1.17 g/cc.

1. 36.5 2. 18.25
3. 32.05 4. 42.10
Subtopic:  Concentration Based Problem |
 67%
From NCERT
AIPMT - 2001
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The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt = 78.4) then the minimum molecular weight of peroxidase anhydrous enzymes is:

1. 1.568 × 104

2. 1.568 × 103

3. 15.68

4. 2.136 × 104

Subtopic:  Equation Based Problem |
 68%
From NCERT
AIPMT - 2001
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