Question

(a)name the method by which alkali metals can be extracted.
(b) what is thr colour of the flame of sodium and potassium

Answer 1

a)Electrolytic method/dissociation
b)sodium-golden yellow
potassium-lilac

Answer 2

(a) Isolation of alkali metals

• Alkali metals can be extracted by a process called electrolysis.
• In this process, instead of using the salts, the chlorides and oxides of the metals of interest are used.
• When chlorides or oxides of these metals are treated with electric current for little period, metal is extracted.

(b) Flame color of sodium and potassium

• As the wavelength of sodium metal is 589.2nm, it burns with a yellow flame.
• As the wavelength of potassium is 766.5nm, it burns with a violet flame.

Learn more about alkali metals

Why alkali metals are more reactive than alkaline earth metals?

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(a) Name the alkali metals. How many

electrons they have in the outermost

orbit.

(b) Take any one alkali metal and write

its reaction with (i) oxygen (ii) water

(iii) acid

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