The volume of oxygen gas (O2) needed to completely burn 1 L of propane gas (C3H8) (both O2 & propane measured at 0°C and 1 atm) will be:
1. 7 L
2. 6 L
3. 5 L
4. 10 L
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An organic compound contains carbon, hydrogen, and oxygen. Its elemental analysis gave C, 38.71%, and H, 9.67%. The empirical formula of the compound would be:
1. | CH3O | 2. | CH2O |
3. | CHO | 4. | CH4O |
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To produce 20 moles of ammonia via Haber's process, how many moles of hydrogen molecules are required?
1. | 40 mol | 2. | 10 mol |
3. | 20 mol | 4. | 30 mol |
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25.3 g of sodium carbonate, Na2CO3, is dissolved in enough water to make 250 mL of a solution. If sodium carbonate completely dissociates, the molar concentrations of sodium ion, Na+ and carbonate ion, are respectively:
(molar mass of Na2CO3 = 106g mol-1)
1. 0.955 M and 1.910 M
2. 1.910 M and 0.955 M
3. 1.90 M and 1.910 M
4. 0.477 M and 0.477 M
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100 mL of solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the solution will be: (final density is 1.25 g/mL )
1. | 4.4 M | 2. | 0.145 M |
3. | 0.52 M | 4. | 0.227 M |
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The formula of an acid is The mass of 0.0242 moles of the acid is 1.657 g.
The atomic weight of X is:
1. | 35.5 | 2. | 28.1 |
3. | 128 | 4. | 19.0 |
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The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 ]
1. | 1.20 m | 2. | 1.56 m |
3. | 1.67 m | 4. | 1.32 m |
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An organic substance containing C, H, and O gave the following percentage composition :
C = 40.687%, H = 5.085% and O = 54.228%. The vapour density of this organic substance is 59.
The molecular formula of the compound will be:
1. C4H6O4
2. C4H6O2
3. C4H4O2
4. None of the above
What is the ratio of the number of atoms in 2.2 g of CO2 and in 1.7 g of NH3?
1. | 1/2 | 2. | 1/8 |
3. | 3/8 | 4. | 3/2 |
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The molality of a 20% (by mass) CaCO3 solution is :
(Given: Density of solution is 1.2 gm/ml)
1. | 1.25 m | 2. | 2.5 m |
3. | 2.08 m | 4. | 1.5 m |
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