Chemistry · Oct / Nov 2021 · Paper 12 · Question 30
Which two statements indicate that metal M may have a proton number between 21 and 30? 1 It conducts electricity. 2 It does not react with water. 3 It forms two basic oxides with formulae MO and M2O3. 4 It forms two coloured sulfates.
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4
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Correct answer: D. 3 and 4
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