At STP the density of CCl₄ vapour in g/L will be nearest to 

(1) 8.67

(2) 6.87

(3) 3.67

(4) 4.26

What is the molarity of H₂SO₄ solution that has a density 1.84 g/cc at $35°\mathrm{C}$ and contains 98% H₂SO₄ by weight?

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

Calculate the molality of 20% CaCO₃ solution is (by mass). The 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

1 cc 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 these

The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by mass. The molar mass of haemoglobin as 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 1.657 g. What is the atomic weight of X?

1.  35.5

2.  28.1

3.  128

4.  19.0

Volume occupied by one molecule of water (density = 1g cm^-3) is

(a) 9.0 x 10^-23 cm³                        (b) 6.023 x 10^-23 cm³

(c) 3.0 x10^-23 cm³                         (d) 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 [MP PMT 1995]

(1) Carbon dioxide

(2) Carbon monoxide

(3) Oxygen

(4) Sulphur dioxide

Oxygen contains 90% O¹⁶ and 10% O¹⁸. Its atomic mass is [KCET 1998]

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17