UNIZIK Chemistry 2009/2010 Day 2 Past Questions

Practice each question, then open it to see the full details.

Zinc oxide is a

A.Basic oxide
B.Acidic oxide
C.Amphoteric oxide
D.Neutral oxide.

When sodium chloride and metallic sodium are each dissolved in water

A.Both processes are exothermic
B.Both processes are endothermic
C.the dissolution of metallic sodium is exothermic
D.The dissolution of metallic sodium is endothermic.

The oxidation state of chlorine in potassium chlorate is

A.+1
B.+2
C.+3
D.+5

When air, which contains the gases oxygen, nitrogen, carbon dioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are

A.nitrogen and carbon dioxide
B.nitrogen and the rare gases
C.the rare gases
D.nitrogen and oxygen

When heat is absorbed during a chemical reaction, the reaction is said to be

A.thermodynamic
B.exothermic
C.isothermic
D.endothermic

The nucleus of an atom contains

A.protons only
B.neutrons only
C.protons and electrons
D.protons and neutrons

Hydrochloric acid is used as a bleach because

A.it is a strong acid
B.it yields chlorine readily in pure water
C.it is an oxidiring agent
D.it is a reducing agent

The most common type of chemical reaction which alkanes undergo is

A.substitution
B.addition
C.condensation
D.polvmeritation

In titration involving sodium ov ide solution and dilute hydrochloric acid, where would you place the base?

A.in the beaker
B.in the conical flask
C.in the burette
D.in the standard flask

Which of the following substances are all made by the process of polymerization?

A.Nylon and soap
B.ethanoic acid, margarine and ethanol
C.Nylon and artificial rubber
D.Nylon and margarine