Q. No.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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Consider the given reaction, 2SO2 + O2 2SO3
6.4 g SO2 and 3.2 g O2 to form SO3 . The mass of SO3 formed is:
1. 32 g
2. 16 g
3. 8 g
4. 4 g
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The total molarity of all the ions present in 0.1 M of CuSO4 and 0.1 M of Al2(SO4)3 solution is:
1. 0.2M
2. 0.7M
3. 0.8M
4. 1.2M
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When 100 mL of PH3 is decomposed, it produces phosphorus and hydrogen. The change in volume is:
| 1. | 50 mL increase. | 2. | 500 mL decrease. |
| 3. | 900 mL decrease. | 4. | None of the above. |
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An element X has the following isotopic composition,
200X : 90%, 199X : 8.0%, 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to:
| 1. | 201 u | 2. | 202 u |
| 3. | 199 u | 4. | 200 u |
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In the reaction, 4NH3(g)+ 5O2(g) 4NO(g) +6H2O(l)
When 1 mole of ammonia and 1 mole of O2 reacts to completion, then:
| 1. | 1.0 mole of H2O is produced. |
| 2. | 1.0 mole of NO will be produced. |
| 3. | All the oxygen will be consumed. |
| 4. | All the ammonia will be consumed. |
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1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. The left-out reactant and its quantity are
(At. weight of Mg = 24, O=16)
| 1. | Mg, 0.16g | 2. | O2, 0.16g |
| 3. | Mg, 0.44g | 4. | O2, 0.28g |
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The mole fraction of the solute in a 1.00 molal aqueous solution is:
| 1. | 0.00177 | 2. | 0.0344 |
| 3. | 0.0177 | 4. | 0.1770 |
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