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JAMB UTME - Chemistry - 2022

Question 1 Report

The sulphide that is commonly used in coating electric fluorescent tubes is?

iron(ii)Sulphide

tin(ii)sulphide

Zinc Sulphide

lead(iv) Sulphide

Answer Details

The sulphide commonly used in coating electric fluorescent tubes is Zinc Sulphide. Zinc Sulphide is a type of material that glows when it is exposed to ultraviolet light. When ultraviolet light is generated inside a fluorescent tube, it excites the Zinc Sulphide particles, causing them to emit visible light. This visible light is what we see as the bright light coming from the tube. So, Zinc Sulphide acts as a phosphor and helps in producing the bright light in fluorescent tubes.

Read lesson note on Acids, Bases And Salts (JAMB)

Acids, Bases And Salts

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Question 9 Report

An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

C

_{4}

H

_{1} 2

O

C

_{3}

H

_{9}

O

C

_{4}

H

_{9}

O

C

_{3}

H

_{8}

O

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Question 18 Report

Electrons enter into orbitals in order of increasing energy as exemplified by?

1S

^{2}

2S

^{2}

2PX

^{2}

2py

^{2}

2pz

^{0}

3s

^{0}

1S

^{2}

2S

^{2}

2PX

^{2}

2py

^{1}

2pz

^{1}

3s

^{0}

1S

^{2}

2S

^{2}

2PX

^{1}

2py

^{1}

2pz

^{1}

3s

^{1}

1S

^{2}

2S

^{2}

2PX

^{2}

2py

^{2}

2pz

^{0}

3s

^{1}

Atomic Structure And Bonding

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Question 28 Report

The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?

CH

_{3}

CH

_{2}

COOH + KOH → CH

_{3}

CH

_{2}

COOK + H

_{2}

O

NH

_{4}

OH + HCL → NH

_{4}

+ H

_{2}

O

NaOH + HCL → NaCL + H

_{2}

O

CH

_{3}

COOH + NaOH → CH

_{3}

COONa + H

_{2}

O

Answer Details

The reaction with the highest ΔH (change in enthalpy) would be the reaction between HCL and NaOH, which forms NaCL and H2O. This is because the formation of water releases energy in the form of heat, which is reflected in the positive ΔH value for this reaction. When an acid and a base react, they neutralize each other and form a salt and water, with the release of heat being a sign of an exothermic reaction.

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Question 33 Report

An organic compound which decolorizes bromine water is likely to be?

C

_{3}

H

_{8}

C

_{2}

H

_{6}

C

_{4}

H

_{1} 0

C $_{2}$ H $_{4}$ $_{2}$ $_{4}$

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Question 34 Report

The dehydration of \( \mathrm{CH_3CH_2CH_2CH_2OH} \) will give?

HC≡CCH

_{2}

CH

_{3}

CH

_{2}

≡CH

_{2}

CH

_{3}

CH

_{3}

C≡CCH

_{3}

CH

_{3}

CH=CHCH

_{3}

Chemistry Of Carbon Compounds (Nigeria Only)

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