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Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
2\(Na_2O_{2(s)} + 2H_2O_{(1)}\)→ 4\(NaOH_{(s)} +O_{2(g)}\) The substance that is oxidized in the reaction above is
A
\(Na_2O_{2(s)}\)
B
NaOH(aq)
C
H2O(1)
D
O2(g)
medium Difficulty
Chemistry UTME / JAMB 2012 Electrolysis & Electrochemical Cells
What number of moles of Cu 2+ will be deposited by 360 coulombs of electricity? [f = 96500 C mol -1]
A
5.36 x 10 -4 mole
B
1. 87 x 10 10 -3 mole
C
9. 35 x 10 -4 mole
D
3. 73 x 10 -3
medium Difficulty
Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
A metal M displaces zinc from ZnCl solution This shows that
A
electrons flow from zinc to M
B
M is more electropositive than zinc
C
M is more electonegative than zinc
D
zinc is more electropositive than M
medium Difficulty
Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\) Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are - 394, -242 and - 110 respectively.
A
+ 262 KJ mol -1
B
- 262 KJ mol -1
C
+ 42 KJ mol -1
D
- 42 KJ mol -1
medium Difficulty
Chemistry UTME / JAMB 2012 Chemical Energetics & Thermochemistry
An increase in entropy can best be illustrated by
A
mixing of gases
B
freezing of water
C
the condensation of vapour
D
solidifying candle wax
medium Difficulty
Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
The highest rate of production of carbon (lV) oxide can be achieved using
A
0.05 mol -3HCI and 5g powdered CaCO3
B
0.05 mol -3HCI and 5g lump CaCO3
C
0.10 mol -3HCI and 5g powdered CaCO3
D
0.025 mol -3HCI and 5g powdered CaCO3
medium Difficulty
Chemistry UTME / JAMB 2012 Non-Metals & Their Compounds
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
A
sulphur (VI) oxide
B
hydrogen chloride
C
sulphur (VI) oxide
D
hydrogen sulphide
medium Difficulty
Chemistry UTME / JAMB 2012 Acids, Bases, pH & Salts
Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
A
N2
B
N2O
C
CI2
D
NH3
medium Difficulty
Chemistry UTME / JAMB 2012 Non-Metals & Their Compounds
Commercial bleaching can be carried out using
A
sulphur (IV) oxide and ammonia
B
hydrogen sulphide and chlorine
C
chlorine and sulphur (IV) oxide
D
ammonia and chlorine
medium Difficulty
Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
Mineral acids are usually added to commercial hydrogen peroxide to
A
oxidize it
B
decompose it
C
minimize its decomposition
D
reduce it to water and oxygen
medium Difficulty
Chemistry UTME / JAMB 2012 Metals, Transition Elements & Extraction
Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?
A
LiCI
B
NaCl
C
CaCl2
D
MgCl2
medium Difficulty
Chemistry UTME / JAMB 2012 Metals, Transition Elements & Extraction
The purest form of iron which contains only about 0.1% carbon is
A
pig iron
B
wrought iron
C
cast iron
D
iron pyrite
medium Difficulty
Chemistry UTME / JAMB 2012 Oxidation, Reduction & Redox Reactions
A common characteristic between zinc and the other transition elements is the ability to
A
have variable oxidation states
B
from complex ions
C
act as a catalyst
D
from coloured ions
medium Difficulty
Chemistry UTME / JAMB 2012 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following metals is the least reactive?
A
Pb
B
Sn
C
Hg
D
Au
medium Difficulty
Chemistry UTME / JAMB 2012 Organic Chemistry I: Hydrocarbons & Crude Oil
Geometric isomerism can exist in
A
hex-3-ene
B
hexane
C
prop-l-ene
D
3-methyl but -l-ene
medium Difficulty
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