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 |
6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of the solution is:
1. | 0.02M | 2. | 0.01M |
3. | 0.001M | 4. | 0.1M |
Which of The following has a maximum number of molecules?
1. 7g N2
2. 2g H2
3. 16g NO2
4. 16g O2
The number of moles of KMnO4 reduced by one mole of KI in an alkaline medium is-
1. One fifth
2. Five
3. One
4. Two
The number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions, is
1. 0.0093 mole
2. 2.10 moles
3. 0.186 mole
4. 0.21 mole
What volume of oxygen gas (O2) measured at and 1 atm, is needed to burn completely 1L of propane gas (C3H8) measured under the same conditions?
1. 7L
2. 6L
3. 5L
4. 10L
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 |
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
1. 1.568 x 103
2. 15.68
3. 2.168 x 104
4. 1.568 x 104
Number of moles of Mn required to oxidise one mole of ferrous oxalate completely in acidic medium will be
1. 0.6 mole
2. 0.4 mole
3. 7.5 moles
4. 0.2 mole
The total number of valence electrons in 4.2g of ion is (NA is the Avogadro's number)
1. 2.1NA
2. 4.2NA
3. 1.6NA
4. 3.2NA