Chemistry 2010 Jamb Examination
Chemistry 2010 Jamb Examination
Question 31
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq)
In the above reaction, the reducing agent is
In the above reaction, the reducing agent is
PH3 is oxidised to H3PO3 while Ag+ (in the silver salt) is reduced to Ag(s). Therefore PH3 donates electrons and is the reducing agent.
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Question 32
The IUPAC nomenclature of the compound LiAlH4 is
IUPAC systematic name is lithium tetrahydridoaluminate(III), which describes the AlH4- anion with lithium as counter-cation. This matches option A.
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Question 33
Substance employed as drying agents are usually
Drying agents absorb moisture from gases or liquids; they are hygroscopic (able to take up water).
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Question 34
Coffee stains can best be removed by
A solution of borax (a mild alkaline cleaner) helps remove tannin-based stains like coffee by breaking down the stain and increasing solubility.
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Question 35
Carbon (II) oxide is considered dangerous if inhaled mainly because it
Carbon(II) oxide (carbon monoxide, CO) binds strongly to haemoglobin, preventing oxygen transport; thus it competes with oxygen in the blood.
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Question 36
The acid that is used to remove rust is
Hydrochloric acid (HCl) is commonly used to remove rust (iron oxides) from metal surfaces (pickling).
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Question 37
The maximum number of electrons in the L shell of an atom is
The L shell corresponds to principal quantum number n=2 and can hold up to 2n2 = 8 electrons.
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Question 38
Elements in the same period in the periodic table have the same
Elements across a period have electrons in the same principal shells (same number of electron shells).
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Question 39
$^{2}_{1}\text{D} + ^{3}_{1}\text{T} \;\to\; ^{4}_{2}\text{He} + ^{1}_{0}\text{n} + \text{energy}$
The reaction above illustrates
The reaction above illustrates
Combination of light nuclei (deuterium D and tritium T) to form helium and a neutron is nuclear fusion.
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Question 40
A noble gas with a high power of fog penetration used in aerodrome beacons is
Neon produces bright, highly visible light used in signalling and beacons; option D (neon) is the correct match as given.
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Do not blame the gods. Let no one blame the powers. My people, learn from my fall.
The powers would have failed if I did not let them use me. They knew my weakness: the weakness of a man easily moved to the defence of his tribe against others.'
O.Rotimi: The Gods are not to Blame.
The speaker in the passage is