Chemistry 2009 Jamb Examination
Chemistry 2009 Jamb Examination
Question 1
Two equal bulbs, one containing ammonia and the other one opened mouth-to-mouth to each other at temperature the entropy in the mixture of gases is likely to
When two gases mix, the process is spontaneous and leads to greater disorder in the system, which is measured by entropy. Entropy tends to increase as particles distribute randomly and evenly, maximizing possible microstates.
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Question 2
A major source of oxide of oxygen is from the burning of
Coal combustion is a significant source of oxides of oxygen, especially carbon dioxide and other related gases. These oxides are produced in high amounts due to the high carbon content of coal compared to other fuels.
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Question 3
Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
The ability of cathode rays to produce a shadow confirms they move in straight lines. Since the rays do not bend around objects, their motion is linear, a fundamental property of cathode rays in vacuum tubes.
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Question 4
The gas that is most useful in protecting humans against solar marathon is
Ozone in the stratosphere absorbs most harmful ultraviolet (UV) radiation from the sun, shielding humans and other living organisms from severe DNA damage, skin cancers, and other harmful biological effects caused by UV exposure.
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Question 5
The acid in electrolysis of water is dilute
Dilute $H_{2}SO_{4}$ is commonly used in the electrolysis of water because it provides sufficient hydrogen and sulfate ions, enhancing electrical conductivity without undergoing significant side reactions like chloride ions would with $HCl$.
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Question 6
The molecular formula of a common organic laboratory anaesthetic is
Chloroform, with formula $CHCl_{3}$, is a well-known laboratory anaesthetic. Although not widely used clinically today due to safety issues, it historically served in surgeries and remains important as a solvent in organic chemistry.
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Question 7
The simplest branched-chain hydrocarbon is
The simplest branched hydrocarbon is isobutane, an isomer of butane, making butane the correct choice. Branched hydrocarbons differ from straight-chain structures by having substituents attached to the main chain carbon atoms.
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Question 8
Organic molecules that have the suffix -ene are unsaturated hydrocarbons that have
Hydrocarbons ending with the suffix -ene contain at least one carbon-carbon double bond. This unsaturation changes their chemical reactivity, allowing them to undergo addition reactions unlike saturated hydrocarbons that contain only single bonds.
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Question 9
Which of the following class of compounds can exist as dipolar ions in solution?
Amino acids contain both an amino group $(-NH_{2})$ and a carboxyl group $(-COOH)$. In aqueous solutions, they exist as zwitterions, with the amino group protonated and the carboxyl group deprotonated, making them dipolar ions.
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Question 10
Lucas reagent is used to test for
Lucas reagent, a mixture of concentrated hydrochloric acid and zinc chloride, is used to distinguish between primary, secondary, and tertiary alcohols. The test works based on the rate of alkyl chloride formation in the solution.
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Musa is STAYING in Enugu.
| ₦ |
₦ |
||
|
Stock 1/1 |
20,000 | Net sales | 370,000 |
|
Add purchases |
250,000 | ||
|
Cost of goods available for sale |
270,000 | ||
|
Less stock 31/12 |
40,000 | ||
|
Cost of goods sold |
230,000 | ||
|
Rent expenses |
35,000 |
Calculate the net profit