Waec Chemistry Past Questions For Year 2001
Question 41
If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is
- A. R(SO4)2
- B. RSO4
- C. R2SO4
- D. R2(SO4)3
Question 42
Which of the following salt solutions will have a pH greater than 7?
- A. NaCl(aq)
- B. Na2CO3(aq)
- C. Na2SO4(aq)
- D. NaHSO4(aq)
Question 43
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40 g mol]
- A. 0.0156 g
- B. 0.625 g
- C. 1.00 g
- D. 25. 0 g
Question 44
Which of the following substances increases in mass when heated in air?
- A. Sodium chloride
- B. lodine crystals
- C. magnesium ribbon
- D. copper (ll) oxide
Question 45
A substance is said to be hygroscopic if it absorbs?
- A. water from the atmosphere to form a solution
- B. heat from the surrounding
- C. carbon (IV) oxide from the atmosphere
- D. moisture from the atmosphere without dissolving