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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 $35°\mathrm{C}$ 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 ${\mathrm{CO}}_3^{2-}$ 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${\mathrm{O}}_3^{-}$ ions in the mixture will be:
1. 0.1M
2. 0.05M
3. 0.2M
4. 0.15M

1cc N₂O at STP contains 
1. $\frac{1.32}{224}\times {10}^{23} \mathrm{electrons}$
2. $\frac{6.02}{22400}\times {10}^{23} \mathrm{molecules}$
3. $\frac{1.8}{224}\times {10}^{22} \mathrm{atoms}$
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 ${\mathrm{HNO}}_3$?
1.  2
2.  $\frac{2}{{\mathrm{N}}_{\mathrm{A}}}$
3.  6
4.  $\frac{6}{{\mathrm{N}}_{\mathrm{A}}}$

The formula of an acid is ${\mathrm{HXO}}_2.$ 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 
(N_A=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