Which property of sodium is being used in street lights?

  • A
    It shows photoelectric effect
  • B
    It has low melting point
  • C
    Sodium atom emits photons in the yellow region of visible spectrum,due to electrically stimulated transitions
  • D
    Sodium vapours show golden colour

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The $Cs^{+}$ ion imparts a violet color to the flame. This is due to the fact that the emitted radiation has .........

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Which element from the following forms a chlorophyll complex?

Assertion $A$: Alkali metals impart characteristic colors to the flame in the flame test.
Reason $R$: They have very low ionization enthalpy.

Compared to alkaline earth metals,what do alkali metals exhibit?

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