The mole was introduced as seventh base quantity for amount of substance. It is the SI unit of amt of substance. One mole contains 6.022×10²⁴ elementary entities. It is fixed numerical value of Avogadro Constant (NА). The amount of substance, symbol n, of a system is a measure of the number of specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles. Let's know more about Mole SI Unit.
1. When 22.4L of H₂(g) is mixed with 11.2L of CL₂(g), each at STP, the moles of HCL(g) formed is equal to...
A. 1 mole of HCL(g)
B. 2 moles of HCL(g)
C. 0.5 moles of HCL(g)
D. 1.5 moles of HCL(g)
2. 20.0g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (atomic weight of Mg=24)
A. 75
B. 96
C. 60
D. 84
3. 6.02×10²ºmolecules of urea are present in 100 ml of its solution. The concentration of the solution is...
A. 0.02M
B. 0.01M
C. 0.001M
D. 0.1M
4. Volume occupied by one molecule of water (density=1g cmˉ³)...
A. 9.0×10×ˉ²³cm³
B. 6.023×10ˉ²³cm³
C. 3.0×10ˉ²³cm³
D. 5.5×10ˉ²³cm³
5. The number of moles of MnOˉ₄ required to oxidize one mole of ferrous oxalate completely in an acidic medium will be...
A. 0.6mole
B. 0.4mole
C. 7.5mole
D. 0.2mole
6. The number of moles of KMnO₄ reduced by one mole of Kl in alkaline medium is...
A. One fifth
B. Five
C. One
D. Two
7. Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight=78.4), then minimum molecular weight of peroxidase anhydrase enzyme is...
A. 1.568×10³
B. 15.68
C. 2.168×10⁴
D. 1.568×10⁴
8. In the reaction- 4NH₃(g)+5O₂(g)+6H₂O(l) When 1 mole of ammonia and 1 mole of O₂ are made to react to completion, then...
A. 1.0 mole of H₂O is produced
B. 1.0 mole of NO will be produced
C. All the oxygen will be consumed
D. All the ammonia will be consumed
9. 0.24g of a volatile gas, upon vaporization, gives 45ml vapor at NTP. What will be the vapor density of the substance? (density of H₂=0.089)...
A. 95.93
B. 59.93
C. 95.39
D. 5.993
10. The percentage weight of Zn in white vitrol [ZnSO₄•7H₂O] is approximately equal to (at. mass of Zn=65, S=32, O=16 and H=1)...
A. 33.65%
B. 32.56%
C. 23.65%
D. 22.65%
11. The number of gram molecules of oxygen in 6.02×10²⁴ CO molecules is...
A. 10g molecules
B. 5g molecules
C. 1g molecule
D. 0.5g molecule
12. What is the weight of oxygen required for the complete combustion of 2.8kg of ethylene?
A. 2.8kg
B. 6.4kg
C. 9.6kg
D. 96kg
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