Dry Tests

Question 1

In flame test which metals show following colors:
i)Red
ii)Violet
iii)Blue
iv)Green
v)Yellow
vi)Orange

Answer 1

i)Li,Sr,Ca,Rb
ii)Rb,K
iii)Cs,Pb
iv)Cu,Ba
v)Na
vi)none
note:Be,Mg dont show color in flame due to high IE
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Question 2

In Borax Bead Test what are the reactions involved for transition metal Cu

Answer 2

Na2B4O7—–>B2O3+NaBO2
CuO + B2O3—–>Cu(BO2)2

Question 3

color of following metals in oxidising (hot) flame,oxidising(cold) flame,reducing(hot)flame,reducing(cold) flame
ii)Ni
iii)Cu
iv)Cr
v)Mn
vi)Co

Answer 3

i)yellow-brown,yellow, green, green
ii)brown, brown, gray, gray
iii)green, blue, colorless, red-brown
iv)green, green, green , green
v)violet, violet, colorless, colorless
vi)blue, blue, blue, blue

Question 4

reactions involved in phosphate bead test or microcosmic salt bead test:

Answer 4

NaNH4HPO4—heat—>NaPO3+NH3+H2O
NaPO3 + CoO—->NaCoPO4