Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

Question

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To determine the increasing order of first ionisation energy (IE1) for Al, Si, and C, we examine the general trends and the known values for these elements. 
Option a: Al, C, Si — This would place aluminum (low IE1) first, followed by carbon, then silicon. However, silicon’s IE1 is higher than aluminum but lower than carbon, so this sequence is incorrect since C should be after Si, not before Si.
Option b: Si, Al, C — Starting with silicon implies Si has the lowest IE1, which is false because aluminum has the lowest IE1 among these three elements. So this ordering is incorrect.
Option c: Al, Si, C — This sequence starts with aluminum, which has the smallest IE1, then silicon, then carbon, which has the highest IE1 among the three. This matches the known values: Al ≈ 5.99 eV, Si ≈ 8.15 eV, C ≈ 11.26 eV, giving an increasing trend Al < Si < C. Therefore this option is correct.
Option d: Si, C, Al — This places silicon before carbon and aluminum last, implying Al has the highest IE1, which is incorrect since aluminum’s IE1 is the lowest among the three.
Option e: C, Si, Al — This would place carbon first with the lowest IE1, which contradicts the actual data where carbon has the highest IE1 among these elements.
Option f: C, Al, Si — This order starts with carbon as the lowest IE1, which is incorrect because carbon has the highest IE1 in this group, not the lowest. 
In summary, only option c presents the correct increasing order Al < Si < C for first ionisation energies, aligning with the known ionisation energy values and periodic trends.

CHM1051 MUM S2 2025 CHM1051 Practice Exam 2

Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

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Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

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