UNN Chemistry 2018/2019 - Model 2 Past Questions

Three drops of a 1.0 ml dm^-3 solution of HCl was added to 20cm³ of a solution of pH 6.4. The pH of the resulting solution will be

The minimum amount of energy required for a reaction to take place is

An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the en' pirical formula

The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

Reduction is the process of

The isomers of C₃H₈O are

On heating, which of the following compounds will decompose to the free metal, nitrogen(IV)oxide and oxygen?

The raw material used for the smelting of iron ore in a furnace is

The sulphide which is insoluble in dilute hydrochloric acid is

In the industrial production of H₂ from natural gas, the CO₂ produced along with the H₂ is removed by

Which of the following typically represents a photochemical reaction?

A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon(IV)oxide to diffuse under the same condition?[C = 12.0, ) = 16.0]

What is the change in oxidation number of manganese in the reaction represented by the following equation?

Which of the following elements is a d-block element?

Which of the following factors would not affect the solubility of a gas?