# Chemistry 2017 Past Questions | WAEC

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

21. Which of the following statements about endothermic reaction is correct?

• A. Activation energy is high
• B. A catalyst is required
• C. It occurs reversibly
• D. Heat energy is absorbed

22.  A 0.1$$moldm^{-3}$$ solution of sodium hydroxide was diluted with distilled water to 0.001$$moldm^{-3}$$. What is the dilution factor?

• A. 1000.00
• B. 100.00
• C. 10.00
• D. 0.01

23. Graphite and Diamond are similar in that they

• A. have octahedral shape
• B. have same density
• C. form carbon(IV) oxide on combustion
• D. conduct electricity

24. In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with

• A. the solvent
• B. dissolved solute particles
• C. the saturated solution
• D. insoluble solute particles

25.  The number of atoms present in 2.5moles of a triatomic gas is equivalent to   [1mole = $$6.02\times 10^{23}$$]

• A. $$2.5\times 10^{23}$$
• B. $$1.5\times 10^{23}$$
• C. $$1.5\times 10^{24}$$
• D. $$2.5\times 10^{24}$$

26. When Magnesium reacts with oxygen, heat is

• A. alkalis
• B. acids
• C. bases
• D. salts

27Which of the following gases is not acidic?

• A. $$SO_{3}$$
• B. $$NO_{2}$$
• C. $$Co_{2}$$
• D. CO

28. A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is   [H= 1.0, C= 12.0]

• A. $$CH$$
• B. $$CH_{2}$$
• C. $$CH_{3}$$
• D. $$CH_{4}$$

29. Which of the following statements is NOT a chemical property of an acid?

• A. Evolution of ammonia when heated with ammonium salts
• B. Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt
• C. Formation of salt and water with alkalis
• D. Formation of salt and hydrogen gas with reactive metals

30. Halogens generally react with metals to form

• A. alkalis
• B. acids
• C. bases
• D. salts

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