Q11 / 160 · TS EAMCET 2023 (13 May Shift 1) · Chemistry

Assertion (A): 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

  • A
    $(\mathrm{A})$ and $(\mathrm{R})$ are true. $(\mathrm{R})$ is the correct explanation for (A)
  • Correct answer
    B
    (A) and (R) are true. (R) is not the correct explanation for (A)
  • C
    (A) is true but (R) is false
  • D
    (A) is false, but (R) is true

Solution

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

Hence, the correct answer is option: 'B'.

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