JEE Main · 2023 · 25 Jan 2023 · Shift 1 · s-Block Elements

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Match List I with List II

List I: Elements
List II: Colour imparted to the flame

Choose the correct answer from the options given below:

Answer: A → II, B → I, C → IV, D → III

Solution

The colour seen in a flame comes from valence electrons that are excited to higher levels in the heat and then fall back, emitting light of a characteristic wavelength. Potassium gives a violet flame, calcium a brick-red flame, strontium a crimson-red flame and barium an apple-green flame. Matching accordingly, potassium pairs with violet, calcium with brick red, strontium with crimson red and barium with apple green.

JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Match the columns

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