iGCSE Chemistry (0620) Core:8.4 Transition elements: Exam Style Questions Paper 1- New Syllabus
▶️ Answer/Explanation
Detailed solution:
Transition elements are typical metals with high melting points and high densities. They also form coloured compounds. A high melting point like 1085°C and a high density fit perfectly. The oxide being a red solid indicates it is coloured, another characteristic property of transition elements. Options A, B, and C have either very low melting points, low densities, or white (colourless) compounds.
▶️ Answer/Explanation
Detailed solution:
Copper(II) sulfate ($\text{CuSO}_4$) contains the transition metal copper, and its compounds are characteristically blue in solution. Cobalt(II) chloride can be blue when anhydrous but forms a pink solution in water. Thymolphthalein and universal indicator are acid-base indicators and don’t give a simple blue solution with just water.
▶️ Answer/Explanation
Detailed solution:
Transition elements are metals with some very characteristic properties. They are known for having high densities and high melting points, so option A fits perfectly. Being metals, they conduct heat very well, so B is wrong. Transition metals are famous for forming coloured compounds, not just white ones, so C is false. And they have characteristically high melting points, not low ones, so D is also incorrect.