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A mixture of NH₄NO₃ and (NH₄)₂HPO₄ contain 30.40% mass per cent of nitrogen. What is the mass ratio of the two components in the mixture?
(1) 2:1
(2) 1:2
(3) 3:4
(4) 4:1

A metal M forms the sulphate M₂(SO₄)_3 . A 0.596 gram sample of the sulphate reacts with excess ${\mathrm{BaCl}}_2$ to give 1.220 g ${\mathrm{BaSO}}_4$. What is the atomic weight of M? (Atomic weights: S=32, Ba=137.3)
(1) 26.9 
(2) 69.7
(3)55.8
(4) 23

SO₂Cl₂ (sulphuryl chloride) reacts with water to given a mixture of H₂SO₄ and HCl. What volume of 0.2 M Ba(OH)₂ is needed to completely neutralize 25 mL of 0.2 M SO₂Cl₂ solution:
(1) 25 mL
(2) 50 mL
(3) 100 mL
(4) 200 mL

100 ${\mathrm{cm}}^3$ of a solution of an acid (Molar mass=98) containing 29.4 g of the acid per litre were completely neutralized by 90.0 cm³ of aq. NaOH containing 20 g of NaOH per 500 cm³. The basicity of the acid is:
(1) 3
(2) 2
(3) 1
(4) data insufficient

A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. Its density is 2.28% g/litre at 300 K and 1.0 atm pressure. Determine the molecular formula of the compound:
1. ${\mathrm{C}}_2{\mathrm{H}}_2$
2. ${\mathrm{C}}_2{\mathrm{H}}_4$
3. ${\mathrm{C}}_4{\mathrm{H}}_8$
4. ${\mathrm{C}}_4{\mathrm{H}}_{10}$

When 22.4L of H₂(g) is mixed with 11.2L of Cl₂(g) each at STP, the moles of HCl(g) formed is equal to 
1. 1 mole of HCl(g)
2. 2 moles of HCl(g)
3. 0.5 mole of HCl(g)
4. 1.5 moles of  HCl(g)

1 c.c of N₂O at NTP contains : 
1. $\frac{1.8}{224}\times {10}^{22}$ atoms
2. $\frac{6.02}{22400}\times {10}^{23}$ molecules
3. $\frac{1.32}{224}\times {10}^{23}$ electrons
4. All the above

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 number of gram molecules of oxygen in 6.02 × 10²⁴ CO molecules are:
1. 10 g molecules
2. 5 g molecules
3. 1 g molecules
4. 0.5 g molecules

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):