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An element X has the following properties: - it is a good reductant - it reacts readily with water to produce molecular hydrogen and a solution containing a colourless ion, X²⁺ - it is naturally strongly radioactive - VCE - SSCE Chemistry - Question 14 - 2003 - Paper 1
Question 14
An element X has the following properties: - it is a good reductant - it reacts readily with water to produce molecular hydrogen and a solution containing a colourl... show full transcript
Worked Solution & Example Answer:An element X has the following properties: - it is a good reductant - it reacts readily with water to produce molecular hydrogen and a solution containing a colourless ion, X²⁺ - it is naturally strongly radioactive - VCE - SSCE Chemistry - Question 14 - 2003 - Paper 1
Step 1
Identify the properties of element X
Answer
Element X is described as a good reductant, which indicates it is likely to be a metal that can donate electrons easily. Additionally, its reaction with water to produce molecular hydrogen and the species X²⁺ suggests it is an alkali or alkaline earth metal. The note on strong radioactivity further narrows down the possibilities.
Step 2
Assess each option based on properties
Answer
- Ra (Radium): This is a radioactive alkaline earth metal that can react with water and produce hydrogen. It fits all properties of element X.
- Cs (Cesium): Another alkali metal, known for being highly reactive, particularly with water. However, it is not strongly radioactive.
- Ca (Calcium): While this metal is reactive and an alkaline earth metal, it is not strongly radioactive.
- Po (Polonium): This element is radioactive, but it is not known for being a good reductant or for reacting with water in the same manner as element X.
Based on the assessment, Ra is the best fit.
Step 3