# 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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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 42.1
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. $1.568$ $×$ ${10}^{4}$

2. $1.568$ $×$ ${10}^{3}$

3. 15.68

4. $2.136$ $×$ ${10}^{4}$

Subtopic:  Equation Based Problem |
69%
From NCERT
AIPMT - 2001
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The specific volume of cylindrical virus particle is $6.02$ $×$ ${10}^{-2}$ $cc/g\mathrm{m w}$hose radius and length are 7 Å & 10Å respectively. If ${N}_{A}$ $=$ $6.023$ $×{10}^{23}$$$\text{mol}^{-1}$$, find the molecular weight.

1. $$15.4 \mathrm{~kg} / \mathrm{mol}$$
2. $$1.54 \times 10^4 \mathrm{~kg} / \mathrm{mol}$$
3. $$3.08 \times 10^4 \mathrm{~kg} / \mathrm{mol}$$
4. $$3.08 \times 10^3 \mathrm{~kg} / \mathrm{mol}$$

Subtopic:  Moles, Atoms & Electrons |
From NCERT
AIPMT - 2001
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