Waec Chemistry Past Questions For Year 2010
Question 6
Which of the following statements about chlorine and iodine at room temperature is correct?
- A. Chlorine is gas and iodine is solid
- B. Chlorine is liquid and iodine is gas
- C. Chlorine and iodine are gases
- D. Chlorine is solid and iodine is liquid
Question 7
Which of the following elements is a d-block element?
- A. Calcium
- B. lron
- C. Lithium
- D. Silicon
Question 8
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
- A. 0.4 mol dm-3
- B. 1.0 mol dm-3
- C. 10.6 mol dm-3
- D. 25.0 mol dm-3
Question 9
Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is
- A. 2:2
- B. 2:1
- C. 1:2
- D. 1:1
Question 10
The bonds in crystaline ammonium chloride are?
- A. covalent and dative
- B. ionic and covalent
- C. ionic covalent and dative
- D. ionic covalent and hydrogen bond
