# 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. $C{H}_{2}N$ 2. ${C}_{2}{H}_{4}N$ 3. $C{H}_{4}N$ 4. $C{H}_{3}N$

Subtopic:  Empirical & Molecular Formula |
76%
From NCERT
AIPMT - 1998
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The mole fraction of the solute in one molal aqueous solution is:

1. 0.027

2. 0.036

3. 0.018

4. 0.009

Subtopic:  Concentration Based Problem |
83%
From NCERT
AIPMT - 2005
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The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminum metal from bauxite by the Hall process is:

1. 90 kg

2. 540 kg

3. 180 kg

4. 270 kg

(Atomic mass : Al = 27)

Subtopic:  Equation Based Problem |
From NCERT
AIPMT - 2005
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The number of moles of $KMn{O}_{4}$ reduced by one mole of KI in an alkaline medium is:

1. One

2. Two

3. Five

4. One fifth

Subtopic:  Millimole/Equivalent Concept |
From NCERT
AIPMT - 2005
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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 |
74%
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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$4N{H}_{3}$ $+$ $5{O}_{2}$ $\to$ $6{H}_{2}O$ $+$ $4NO$

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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