Multiple choice

Which of the following statements are FALSE regarding alkali metals?

  1. All alkali metals dissolve in liquid ammonia giving deep blue solutions.
  2. All alkali metals exhibit photoelectric effect.
  3. Reducing character of alkali metals in the gaseous state increases down the group.
  4. Lithium is most reactive but the weakest reducing agent among all the alkali metals.

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Alkali metals (except Li) exhibits photoelectric effect. The ionization enthalpy of lithium is quite high. The photons of light are not in a position to eject electrons from the surface of lithium metal. Therefore, photoelectric effect is not observed in lithium. Lithium is least reactive but the strongest reducing agent among all the alkali metals.

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