Chemistry Past Questions and Answers

Question 11 :

• JAMB 2019

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

A. Thermodynamic
B. Exothermic
C. Isothermal
D. Endothermic
E. Thermostatic

Question 12 :

• JAMB 2019

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

A. Disintegration
B. Polymerization
C. Cracking
D. Degradation
E. Distillation

Question 13 :

• JAMB 2019

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

A. None of these solutions is acidic
B. The pH of Y is made more acidic by addition of distilled water
C. Z is the most acidic solution
D. W is the most acidic solution
E. X is neutral

Question 14 :

• JAMB 2019

When each of the nitrates of Potassium, Magnesium and iron is heated

A. All the nitrates decompose to their oxides
B. The nitrate of magnesium gives the nitrite and oxygen
C. The nitrates of iron magnesium and iron give the oxides
D. The nitrate of iron gives the nitrite and oxygen
E. The nitrate of the magnesium is not decomposed

Question 15 :

• JAMB 2019

Which of the following metals cannot replace hydrogen from water or steam?

A. Sodium
B. Magnesium
C. Iron
D. Calcium
E. Copper