Steam changes the colour of anhydrous cobalt (II) chloride from?
A. blue to pink B. white to red C. white to green D. blue to white Correct Answer: Option A – blue to pink
The property which makes alcohol soluble in water is the?
A. boiling point B. hydrogen bonding C. ionic character D. covalent nature Correct Answer: Option B – hydrogen bonding
The substance least considered as a source of environmental pollution is?
A. Lead compounds B. Organophosphorous compounds C. Silicate minerals D. Uranium Correct Answer: Option C – Silicate minerals
25cm³ of a 0.2 mol dm³ solution of Na2CO3 requires 20 cm³ of a solution of HCl for neutralization. The concentration of the HCl solution is?
A. 0.5 mol dm³ B. 0.6 mol dm³ C. 0.2 mol dm³ D. 0.4 mol dm³ Correct Answer: Option A – 0.5 mol dm³Products
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