Waec Chemistry Past Questions For Year 2004
Question 31
Which of the following statements is true of an endothermic reaction? I. Heat is absorbed from the surrounding II. The heat content of the products is more than that of the reactants III. The enthalpy change is positive IV. The surrounding is at a lower temperature than the system.
- A. l only
- B. l and ll only
- C. l,ll and lll only
- D. l, ll, lll and lV
Question 32
The condensation of several amino acid molecules gives
- A. long chain alkanoic acids
- B. secondary alkanols
- C. alkanoates
- D. proteins
Question 33
When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of
- A. calcium only
- B. zinc only
- C. calcium and znic only
- D. sodium and zinc only
Question 34
Consider the cell represented below: Zn/Zn2+(aq) // Cu2+(aq) / Cu(s). Which of the following statements is correct about the cell
- A. Zn is oxidized to Zn2+
- B. Cu is oxidized to Cu2+
- C. It is an electrolytic cell
- D. each single line represents a salt bridge
Question 35
Which of the following is required in an experiment to determine the enthalpy of solution of anhydrous CuSO? l. Mass of the anhydrous CuSO 4 II. Volume of water in which the CuSO4 is dissolved lll. lnitial temperature of water lV. Final temperature of the solution
- A. l and ll only
- B. lll and IV only
- C. ll, lll, and IV only
- D. l, ll, lll, and IV only
