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JEE · NEET Previous Year Question

Assertion : Alkali metals and their salts impart characteristic flame colours.
Reason (R): Alkali metals have low ionization enthalpy values. So, electron excitation is possible.The correct option among the following is

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

  1. A and are true but is the correct explanation for (A)
  2. B(A) and (R) are true. (R) is not the correct explanation for (A)
  3. C is true but (R) is false
  4. D is false, but (R) is true

Correct answer: B

Solution

(b) Assertion (A) is true as the alkali metals and their salts impart colour to the flame due to characteristic and low ionızation energies.
Reason (R) is a true statement and it also explain Assertion (A).

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