Chemistry 2017 Jamb Examination
Question 1
Hence, the correct formula is RCOR.
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Question 2
Alnico is an alloy of aluminium, nickel, and cobalt.
The common element in both alloys is aluminium (Al).
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Question 3
Therefore, the shape of the s-orbital is spherical.
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Question 4
Aluminium hydroxide acts as a mordant in the dyeing industry.
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Question 5
Hence, iodine is dissolved in ethanol.
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Question 6
CaCO3 + CO2 + H2O → Ca(HCO3)2
Therefore, it is formed when rainwater flows over CaCO₃ deposits.
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Question 7
\( \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{CO}_3 \)
Carbonic acid \( (\text{H}_2\text{CO}_3) \) is a weak acid.
Therefore, COâ‚‚ is the acid anhydride that produces a weak acid.
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Question 8
Example: \( \text{O}_3 \) shows resonance between two structures.
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Question 9
The acid acts as a dehydrating agent, removing water to drive the reaction forward:
\[ \text{CH}_3\text{COOH} + \text{C}_2\text{H}_5\text{OH} \xrightarrow{\text{conc. H}_2\text{SO}_4} \text{CH}_3\text{COOC}_2\text{H}_5 + \text{H}_2\text{O} \]Â
Hence, concentrated Hâ‚‚SOâ‚„ is used to remove water.
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Question 10
4Fe + 6H2O + 3O2 → 4Fe(OH)3 Fe(OH)3 dehydrates to form Fe2O3·xH2O (rust)
Hence, O2 and H2O are the necessary constituents.
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