Mole fraction of the solute in a 1.00 molal aqueous solution is
(1) 0.0177
(2) 0.0344
(3) 1.7700
(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:
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:
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: