2021 NECO CHEMISTRY PRACTICAL EXPO QUESTIONS & ANSWERS
2021 NECO CHEMISTRY PRACTICAL EXPO QUESTIONS & ANSWERS COMPLETE CHEMISTRY PRACTICAL QUESTIONS & ANSWERS NOW AVAILABLE. subscribe for the expo if you don’t want late answers.
NO1
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(2a)
TEST
C + 5cm³ of distilled water
OBSERVATION
It dissolve completely
INTERFERENCE
C is a soluble salt
(2bi)
TEST
Solution + NaOH + Heat
OBSERVATION
Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off.
INFERENCES
NH³ gas from NH⁴+ is present
(2bii)
TEST
Stirring rod of HCL + gas given off
OBSERVATION
a gas which gives a pop sound is given off
INFERENCES
H² is present
(2ci)
TEST
Solution C + drops of BaCL²
OBSERVATION
a white precipitate is formed
INFERENCES
CO²^-3, SO²^-4, SO²^-3, May be present.
(2cii)
TEST
Solution in C(i) + dil HCL
OBSERVATION
the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off
INTERFERENCE
CO² gas from CO²^3- confirmed
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(3a)
(i)Ca²+
(ii)Pb²+
(3bi)
concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water.
(3bii)
A strong acid is defined as a type of acid that ionize completely in a solution
(3c)
Activated charcoal is used as an adsorbent material
(3d)
(i)Reddish – Brown
(ii) I – red, II – brown.
*CORRECTION*
*(3dii)*
I Hot —-> Yellow
II Cold —-> White
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