The concentrated nitric acid is 70% HNO3. The amount of concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3 is-
1. 45.0 g conc. HNO3
2. 90.0 g conc. HNO3
3. 70.0 g conc. HNO3
4. 54.0 g conc. HNO3
Difficulty Level:
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
Difficulty Level:
6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of solution is-
1. 0.02M
2. 0.01M
3. 0.001M
4. 0.1M
Difficulty Level:
Which of The following has a maximum number of molecules?
1. 7g N2
2. 2g H2
3. 16g NO2
4. 16g O2
Difficulty Level:
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
Difficulty Level:
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
Difficulty Level:
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
Difficulty Level:
1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. The reactant left in excess and its amount is-
(At. weight of Mg = 24, O=16)
1. Mg, 0.16g
2. O2, 0.16g
3. Mg, 0.44g
4. O2, 0.28g
Difficulty Level:
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
Difficulty Level:
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
Difficulty Level: