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Author Topic: CORRECT: 2024 WAEC GCE CHEMISTRY ANSWERS (ALT. PRACTICAL)  (Read 4881 times)

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Offline MANDINHO

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CORRECT: 2024 WAEC GCE CHEMISTRY ANSWERS (ALT. PRACTICAL)
« on: November 20, 2024, 09:07:26 am »

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Offline MANDINHO

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CHEMISTRY PRACTICAL ANSWERS

(1)




===================================

(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.
===================================

(3)



===================================

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