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(2a)
TEST; C + distilled water + shake
OBSERVATIONS; It dissolves to give a colourless or clear solution
INFERENCE; Soluble salt suspected
(2ai)
TEST; Solution C + litmus paper
OBSERVATIONS; It has no effect on both blue and red litmus paper
INFERENCE; Neutral solution
(2aii)
TEST; solution C + Fehling solution A and B + heat
OBSERVATIONS; It gives a black red colour
INFERENCE; Reading agent confirmed
(2bi)
TEST; D + heat
OBSERVATIONS; It turns yellow on heating and white on cooling
INFERENCE; ZnO is present
(2bii)
TEST; D + dilute Hcl + heat
OBSERVATIONS; It dissolves completely to give a clear or colourless solution
INFERENCE; Solution chlorides of Zn³+, Al³+ is present
(2biii)
TEST; Solution D + NaOH in drops and then in excess
OBSERVATIONS; It gives white gelatinous precipitate. The precipitate is soluble in excess.
INFERENCE; Al³+, Zn²+ present.
Al³+, Zn²+ present .
(2biv)
TEST; Solution D + NH3 in drops and then in excess
OBSERVATIONS; It gives white gelatinous precipitate. The precipitate is soluble in excess NH3
INFERENCE; Al³+, Zn²+ is present.
Zn²+ confirmed
