Waec Chemistry 1995 Past Questions and Answers

Question 11:

• WAEC 1995

Alums are classified as

A. Simple salt
B. Acid salts
C. Anhydrous salts
D. Double salts
E. Basic salts

Question 12:

• WAEC 1995

Sodium chloride cannot conduct electricity in the solid state because it

A. Is a normal salt
B. Is highly soluble in water
C. Is an electrovalent compound
D. Does not have any effect on litmus
E. Does not contain mobile ions

Question 13:

• WAEC 1995

What mass of copper will be deposited by the liberation of Cu²⁺ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]

A. 64g
B. 32g
C. 12.8g
D. 6.4g
E. 3.2g

Question 14:

• WAEC 1995

What mass of copper will be deposited by the liberation of Cu²⁺ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]

A. 64g
B. 32g
C. 12.8g
D. 6.4g
E. 3.2g

Question 15:

• WAEC 1995

Which of the following is not correct of the reaction represented by the equation below? 2C_(s) + O_2(g) → 2CO_(g); ∆H = - xKJ

A. There is an increase in entropy ;
B. There is anincrease in gaseous volume
C. Carbon (lV) oxide is produced
D. The oxidation number of carbon increases from 0 to +2
E. The reaction is exothermic