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Chemistry Past Questions

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137 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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137 questions

Question 1 of 17 137 total questions

Question 61

jamb 2024

If the solubility of KNO\(_3\) at 30\(^0\)C is 3.10 mol/dm\(^3\) a solution containing 303g/dm\(^3\) KNO\(_3\) is likely to be

Asaturated

Bunsaturated

Csupersaturated

Dat saturation point

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Question 62

jamb 2024

When a few drops of Millon reagents is added to egg-white solution in a test tube, the white precipitate changes to

Aorange

Bbrick red

Creddish brown

Dblue

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Question 63

jamb 2024

How many isomers has the organic compound represented by the formula C\(_3\)H\(_8\)O ?

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Question 64

jamb 2024

The number of geometrical isomers of butene are

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Question 65

jamb 2024

A gas when mixed with oxygen, it produces a very hot and early controllable flame. What is the name of the flame and where is it used?

AAcetylene flame; miners' lamb

BOxy-ethylene ; hunters' torch

COxy-ethylene flame; miners' lamb

DOxy-ethylene flame ; cutting and welding metals

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Question 66

jamb 2024

Biuret test is a chemical test used for detecting the presence of

Acarbohydrates

Bproteins

Camines

Dalkanoates

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Question 67

jamb 2024

The empirical formula of an organic liquid hydrocarbon is XY. If the relative molar masses of X and Y are 72 and 6 respectively, it's vapour density is likely to be

A33

B66

C39

D78

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Question 68

jamb 2024

An organic compound contains 53.1% Carbon, 6.2% Hydrogen, 12.4% Nitrogen, and 28.3% Oxygen by mass. What is the molecular formula of the compound if its vapour density is 56.5? [ C =12, H = 1, N = 14, O = 16].

AC\(_5\)H\(_7\)NO\(_2\)

BC\(_5\)H\(_6\)NO\(_2\)

CC\(_3\)H\(_6\)NO\(_2\)

DC\(_3\)H\(_7\)NO\(_2\)

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Question 69

jamb 2024

A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is

Axylene

Bbenzene

Chexane

DToluene

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Question 70

jamb 2024

During the fractional distillation of crude oil, the fraction that distills at 200 - 250\(^0\) C is

Abitumen

Bdiesel

Ckerosene

Dpetrol

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Question 71

jamb 2024

The constituent of petroleum fraction used in surfacing road is

Apetrol

Bdiesel

Clubricating oil

Dbitumen

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Question 72

jamb 2024

When Calcium ethynide is decomposed by water, the gas produced is

ACO

BH\(_2\)

CC\(_2\)H\(_2\)

DCH\(_4\)

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Question 73

jamb 2024

In the extraction of Aluminium, the silica impurity is removed by

Aelectrolysis

Bfiltration

Creaction with H\(_2\)SO\(_4\)

Dprecipitation

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Question 74

jamb 2024

Silver and Gold are metals found as free uncombined elements in the earth's crust, which makes them to be referred to as

Acorrosive metals

Breactive metals

Cnatural metals

Dnoble metals

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Question 75

jamb 2024

The constituents of Alnico are Aluminium, Nickel and

AMg

BCo

CMn

DCu

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Question 76

jamb 2024

The number of molecules of helium gas contained in 11.5g of the gas is

A1.73 x 10\(^{23}\)

B1.73 x 10\(^{22}\)

C1.73 x 10\(^{24}\)

D1.73 x 10\(^{21}\)

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Question 77

jamb 2024

At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that

AGas Y is two times as heavy as Gas X

BGas Y is four times as heavy as Gas X

CGas Y is monoatomic

DGas X is diatomic

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