BEST EXPO RUNZ ASSISTANCE WEBSITE. NO.1 BEST DELIVERY OF EXAM RUNZ
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(1)
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(2a)
In a Tabular form
=TEST=
A + heat
= OBSERVATION=
Colourless, odourless gas turned limewater milky.
=INFERENCE=
CO₂ gas evolved, indicating a carbonate or bicarbonate.
(2b)
=TEST=
Residue from (a) + water + litmus paper
=OBSERVATION=
Dissolved to form a colourless solution, turned red litmus paper blue.
=INFERENCE=
Basic solution, likely an alkali such as a metal hydroxide (e.g, Ca(OH)₂).
(2c)
=TEST=
Solution from (b) + NaOH(aq) in drops, then in excess
=OBSERVATION=
White precipitate formed, soluble in excess NaOH.
=INFERENCE=
Al³⁺ ions present.
(2d)
=TEST=
B + water
=OBSERVATION=
Soluble salt.
=INFERENCE=
No direct reaction or insoluble residue indicates a soluble ionic compound.
(2e)
=TEST=
Solution from (d) + NaOH(aq) in drops, then in excess
=OBSERVATION=
White gelatinous precipitate formed; precipitate soluble in excess.
=INFERENCE=
Al³⁺ ions confirmed.
(2f)
=TEST=
Solution from (d) + NH₃(aq) in drops, then in excess
=OBSERVATION=
White precipitate formed, insoluble in excess.
=INFERENCE=
Al³⁺ ions confirmed.
(2g)
=TEST=
Solution from (d) + AgNO₃(aq) + HNO₃(aq) + NH₃(aq) in excess
=OBSERVATION=
White precipitate formed with AgNO₃, soluble in NH₃ after adding HNO₃.
=INFERENCE=
Cl⁻ ions present and confirmed.
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(3)
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