1999 WAEC SSCE Chemistry Past Questions

1999

All your burette readings (initial and final), as well as the size of your pipette, must be recorded but on no account of experimental procedure is required. All calculations must be done in your answer book.(a) Put A in…

1999

Credit will be given for strict adherence to instructions, for observations precisely recorded and for accurate inferences. All tests observations and inferences must be clearly entered in your answer book. in ink, at th…

1999

(a) List two gases in each case which;(i) can be used to demonstrate the fountain experiment;(ii) decolourize acidified potassium tetraoxomanganate (VII).(b) State briefly how you would distinguish between(i) crystals of…

1999

(a)(i) List two elements which react with steam at red heat to produce hydrogen.(ii) Explain why an aqueous solution of potassium bromide turned reddish brown on bubbling chlorine through it.(iii) Write an equation for t…

1999

(a)(i) Define allotropy.(ii) Name the allotrope of carbon used in gas masks.(iii) Mention two other elements which exhibit allotropy apart from carbon.(b) List the products of each of the following reactions:(i) Heating…

1999

(a)(i) Give two differences between a conductor and an electrolyte.(ii) State three applications of electrolysis.(iii) Write equation for the reaction at each electrode when a dilute solution of sodium chloride is electr…

1999

(a) The letters R,S,T represent an alkene, an alkene and a terminal alkyne respectively. Which of R, S and T typically undergo(es) the following reactions?(i) Addition reaction;(ii) Combustion;(iii) Substitution reaction…

1999

a)(i) State three differences between covalent compounds and electrovalent compounds.(ii) Two elements represented as K and L have atomic numbers of 12 and 8 respectively. Write their electronic structures and state the…

1999

(a)(i) State three postulates of the kinetic theory of gases.(ii) Draw a sketch to illustrate Boyle's law.(iii) Explain what is meant by "absolute zero of temperature".(b) Equal volumes of a gas X and oxygen are at the s…

1999

Which of the following atoms contains the highest number of electrons in the outermost shell?

1999

Calcium atom ionizes by

1999

Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore

1999

Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?

1999

Pauli Exclusion Principle is related to

1999

What is the electronic configuration of an element represented as 199X?

1999

The crystal layers in graphite are held together by

1999

Which of the following halogens is the most reactive?

1999

Which of the following reactions is not feasible?

1999

In the Periodic Table, the elements that loss electrons most readily belong to

1999

Which of the following properties increases down a group in the Periodic Table?

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