UNN Chemistry 2012/2013 Past Questions

Which of the following statements is incorrect?

20g of calcium trioxocarbonate (IV) is heated to constant mass and 11.2g of calcium oxide is left as residue. The mass of the gaseous product left [Ca = 40, C = 112, O = 16]

The vapour pressure of water at 15°C is 13mmHg. At a barometric pressure of 747 mmHg, 2dm³ of nitrogen gas is collected over water at 15°C. The pressure of nitrogen gas is

Elements X, Y and Z belong to groups I, V and VI respectively. Which of the following is TRUE about the bond types of XZ and YZ₃?

Which of the following is a double salt?

Find the value of n in the equation
XO^n-₃ + 4H⁺ + 3e^- ---> XO + 2H²

Corrosion in metals is an example of

An example of a suspension of solid particles in a gas is

In which of the following is the change in entroypy positive?

2SO_2(g) + O_2(g) <---> 2SO_3(g) ∆H = -ve The formation of SO₃ in the equation above will be favoured by

When ²³⁸₉₂U emits and x-ray and a B-ray, the product X has a mass number and an atomic number respectively

The producer gas is a mixture of

The IUPAC name of the compound below is
H₃CCH(CH₃)CHCHCH₃

Ethanol reacts with aqueous Sodium oxoiodate (I) to give a bright yellow solid with a characteristic smell. The product is

Plastics which lose their plasticity on being subjected to heat are said to be