Waec Chemistry Past Questions For Year 1992
Question 31
Which of the following statements is not correct? The 4s orbital
- A. is defined by the quantum number 1 = O
- B. is of higher energy than the 3d orbital
- C. contains a maximum of two electrons
- D. is spherical about the nucleus
- E. is filled before the 4p orbital
Question 32
Which of the following statement is not correct about esterification?
- A. It is a slow reaction
- B. the process is reversible
- C. it is similar to hydrolysis
- D. it is catalysed by acids
- E. the products usually have a fruity smell
Question 33
Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?
- A. Electrons are present in metals but not in salt solutions
- B. Metals are conductors while salts are electrolytes
- C. Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution
- D. salts ionize in aqueous solutions while metals do not
- E. Metals are reducing agents while salts are not
Question 34
A dye is suspected to have contaminated a lollipop. Which of the following is the best method by which the contaminant may be isolated?
- A. Fractional distillational
- B. Recrystallization
- C. Filtration
- D. Paper chromatography
- E. Evaporation
Question 35
What is the value of n in the following equation? XO-4 +8H + + ne- → X2 + + 4H2O
- A. 2
- B. 3
- C. 4
- D. 5
- E. 6
