Ijmb Model Questions Vol1 2020 Chemistry Question 2

Practice practical question 2 from the 2020 Ijmb Model Questions Vol1 Chemistry examination. This question covers Periodic Table .

Ijmb Model Questions Vol1 2020 Chemistry Practical
Topic: Periodic Table
Question 2 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • practical

During a flame‑test investigation, three unknown solid samples (A, B and C) were introduced separately into a non‑luminous Bunsen‑burner flame using clean nichrome wires. The observed flame colours were recorded as follows: - Sample A: bright orange‑red flame - Sample B: lilac flame - Sample C: brick‑red flame All other experimental conditions (wire cleaning, flame temperature, ambient lighting) were kept constant.

Question Parts

( a )
Identify the metal ion present in each sample based on the flame colour observed.
( b )
Arrange the three identified metal ions in order of increasing first ionisation energy. Provide the approximate first ionisation energy values you used and justify the order using periodic trends.
( c )
It is suspected that sample B contains a mixture of two metal ions, one of which gives a lilac flame and the other a yellow‑orange flame (characteristic of sodium). Propose a practical method to separate the two ions before performing the flame test.
( d )
State two precautions that should be observed to avoid cross‑contamination between successive flame‑test samples.

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About This Question

This is Ijmb Model Questions Vol1 2020 Chemistry Question 2. It is one of the practical questions from the 2020 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Periodic Table .

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