The average molar mass of the mixture of CH4 and C2H4 present in the mole ratio of a:b is 20 g mol-1. When the mole ratio is reversed, the molar mass of the mixture will be:

1. 24 gram 2. 42 gram
3. 20 gram 4. 15 gram

Subtopic:  Moles, Atoms & Electrons |
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Vapour density of a volatile substance is 4 CH4=1. Its molar mass would be:

1.  8

2.  2

3.  64

4.  128

Subtopic:  Moles, Atoms & Electrons |
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The haemoglobin from the red blood corpuscles contains approximately 0.33%  iron
by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is :
(atomic mass of iron=56):

1. 2 2. 3
3. 4 4. 5
Subtopic:  Moles, Atoms & Electrons |
 73%
From NCERT
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The vapour density of a volatile chloride of a metal is 95 and the specific heat of the metal is 0.13 cal/g. The equivalent mass of the metal will be:

1.  6 g
2. 12 g
3.  18 g
4.  24 g

Subtopic:  Moles, Atoms & Electrons |
 64%
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Which mixture is lighter than humid air?

1.  N2+O2+SO2

2.  N2+O2+CO2

3.  N2+O2+C2H6

4.  N2+O2+He

Subtopic:  Moles, Atoms & Electrons | Equation Based Problem |
 76%
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O3 is absorbed by:

1.  Pyrogallol

2.  Menthol

3.  Turpentine oil

4.  Clove oil

Subtopic:  Introduction |
 62%
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Read the following statements (S) and Explanation (E). Choose the correct answers from the codes (1), (2), (3) and (4):

S : An element may have variable equivalent mass.

E : Such elements should possess variable valency. 

1.  S is correct but E is wrong
2.  S is wrong but E is correct
3.  Both S and E are correct and E is correct explanation of S
4.  Both S and E are correct but E is not correct explanation of S

Subtopic:  Equivalent Concept |
 67%
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0.5 g of fuming H2SO4 (oleum) is diluted with water. The solution requires 26.7 mL of 0.4 N NaOH for complete neutralization. Find the % of free SO3 in the sample of oleum. Also report % of oleum solution.

1. 104.68 %

2. 98 %

3. 106.13%

4. 56 %

 

Subtopic:  Concentration Based Problem |
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Calculate the mass of CaO required to remove the hardness of 106 litre of water containing 1.62 g of calcium bicarbonate per litre.

1. 5.6*10^-6 

2. 5.6*10^5

3. 4.8*10^9

4. 1.2*10^-4

Subtopic:  Equation Based Problem |
 58%
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A sample of CaCO3 and MgCO3 weighed 2.21 g is ignited to constant mass of 1.152 g. What is the composition of mixture? Also calculate the volume of CO2 evolved at 0°C and 76 cm of pressure.

 

1.640 ml

2.540 ml

3.500 ml

4.600 ml

Subtopic:  Moles, Atoms & Electrons |
 68%
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