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Selina Solutions Class 9 Chemistry Solutions for Exercise 5C in Chapter 5 - Chapter 5 The Periodic Table
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a) Name the method by which alkali metals can be extracted.
b) What is the color of the flame of Sodium and Potassium?
Answer:
a) Alkali metals can be extracted by electrolysis of their molten state.
b) The color of the flame of sodium is golden yellow, and the color of the flame of potassium is pale violet.
Video transcript
"hello dear student i'm sunita and from
leader learning
let's answer this question which is name
the method by which
alkali metals can be extracted
so let's answer that first
so i will write a over here
so alkali metals can be extracted
metals are
extracted
by electrolysis of
of
their
molten
chlorides or oxides
for example lithium is extracted by
electrolysis of a fused mixture of dry
lithium chloride and potassium chloride
now the reason why they cannot be
extracted
by other methods like reduction
or by displacement
or even by electrolysis of the aqueous
solutions
because one alkales themselves
are strong reducing agents
so they cannot be extracted by reduction
then being highly reactive they cannot
be displaced from their solutions by
other elements
and finally they cannot be extracted by
electrolysis of
aqueous solutions of their salts because
hydrogen will be liberated at the
cathode instead of the alkali metal
right now second part of the question is
what is the color
of the flame of sodium and potassium
so here we have a picture of the flames
of sodium and potassium so this is
sodium
a bright yellow flame and potassium has
a pale
violet flame so let's write that
the second answer is
sodium has a
has a bright yellow flame
and potassium
a pale violet flame
so i hope this answers the question
satisfactorily
do drop in a comment if you have any
doubts
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thank you"
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