At STP, the density of CCl4 vapour in g/L will be closest to
1. 8.67
2. 6.87
3. 3.67
4. 4.26
The molarity of H2SO4 solution that has a density 1.84 g/cc at and contains 98% H2SO4 by weight is -
1. 1.84 M
2. 81.4 M
3. 18.4 M
4. 184 M
25.3 g of Sodium carbonate Na2CO3 is dissolved in enough water to make 250 mL of
solution. If sodium carbonate dissociates completely, molar concentration of sodium ion,
Na+ and carbonate ion are respectively (Molar mass of Na2CO3 = 106 g mol-1)
1. 0.955 M and 1.910 M
2. 1.910 M and 0.955 M
3. 1.90 M and 1.910 M
4. 0.477 M and 0.477 M
The molality of a 20% (by mass) CaCO3 solution is
(Density of solution is 1.2 gm/ml)
1. 1.25 m
2. 2.5 m
3. 2.08 m
4. 1.5 m
Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of N ions in the mixture will be:
1. 0.1M
2. 0.05M
3. 0.2M
4. 0.15M
1cc N2O at STP contains
1.
2.
3.
4. All of the above
The haemoglobin from the red blood corpuscles contains approximately 0.33% iron by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is -
(atomic mass of iron=56):
1. 2
2. 3
3. 4
4. 5
What is the number of moles of O-atom in 126 amu of ?
1. 2
2.
3. 6
4.
The formula of an acid is The mass of 0.0242 moles of the acid is 1.657 g. The atomic weight of X is -
1. 35.5
2. 28.1
3. 128
4. 19.0
Volume occupied by one molecule of water (density = 1g cm-3) is
(1) 9.0 x 10-23 cm3
(2) 6.023 x 10-23 cm3
(3) 3.0 x10-23 cm3
(4) 5.5 x10-23 cm3
The number of atoms in 0.1 mole of a triatomic gas is
(NA=6.02 x1023mol-1)
1. 6.026 x 1022
2. 1.806x1023
3. 3.600 x 1023
4. 1.800 x 1022
4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be
1. Carbon dioxide
2. Carbon monoxide
3. Oxygen
4. Sulphur dioxide
Oxygen contains 90% O16 and 10% O18. Its atomic mass is
(1) 17.4
(2) 16.2
(3) 16.5
(4) 17