Waec Chemistry Past Questions For Year 2002
Question 21
If a metal R forms a compound with the formula R(NO3)2 , the formula of its tetraoxosulphate (IV) is
- A. R(SO4)2
- B. RSO4
- C. R2SO4
- D. R2(SO4)3
Question 22
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 23
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
Question 24
Which of following acids forms normal salts only?
- A. Tetraoxosulphate (VI) acid
- B. Trioxosulphate (IV) acid
- C. Acetic acid
- D. Tetraoxophosphate (V) acid
Question 25
A major factor considered in selecting a suitable method for preparing a simple salt is its
- A. crystalline form
- B. melting point
- C. reactivity with dilute acids
- D. solubility in water
