UNN Chemistry 2020/2021 Past Questions

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

Aluminium is a good roofing material because it

An atom can turn into an ion if it

Commercial bleaching can be carried out using

The following compounds contain the same type of bonds except

A positive brown ring test indicates the presence of

The gas produced when a mixture of sodium propanoate and soda lime is heated is

Pauli Exclusion Principle is related to

The oxidation state of chlorine in HClO is

Which of the following hydrogen halides has the highest entropy value

When a substance disappears completely as a gas on heating, the substance is said to have undergone

Vulcanization involves the removal of

A pure solid usually melts .........

A small quantity of solid ammonium chloride was heated gently in a test tube; the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone ............

CH₄ has this geometry: