Jamb Chemistry Past Questions For Year 2014
Question 11
16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3
[Pb = 207, N = 14, O = 16]
- A. 0.05 g
- B. 2.00 g
- C. 1.00 g
- D. 0.50g
Question 12
On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as
- A. efflorescence
- B. deliquescence
- C. hygroscopy
- D. hydrolysis
Question 13
Water is said to be temporarily hard when it contains
- A. Ca (HCO3)2 and Mg (HCO3)2 salts
- B. Ca (HCO3)2 and CaCO3 SALTS
- C. Mg(HCO3)2 and CaSO4 salts
- D. CaSO4 and Ca(HCO3)2 salts
Question 14
A silicon -containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.
- A. 14.00
- B. 29.00
- C. 28.11
- D. 28.00
Question 15
Which of the following salts will turn blue litmus red?
- A. Sodium tetrahydroxozincate (ll)
- B. Sodium hydrogentetraoxosulphate (VI)
- C. Sodium trioxocarbonate (lV)
- D. Zinc chloride hydroxide
