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Jamb Chemistry CBT Practice Quiz (2021 Prep)

Updated On May 25, 2021 By Flash Isaac

Welcome to Flashlearners Chemistry Quiz... Read Each Question Carefully And Choose The Best Answer From The Options. You May Click Here for Free Video Tutorials To Boost Your Score Or Simply Click Here To Access Thousands of Chemistry Questions Offline. Next To Begin...

1. A piece of burning sulphur will continue to burn in a gas jar of oxygenA piece of burning sulphur will continue to burn in a gas jar of oxygen to give misty fumes which readily dissolve in water. The resulting liquid is

sulphur (1V) trioxide

Tetraoxosulphate acid (V1)

Trioxosulphate (1V) acid

Dioxosulphate (11) acid

2. Consecutive members of an alkane homologous series differ by

CH

CH2

CH3

CnHn

3. The flame used by welders in cotton metals is

butane gas flame

acetylene flame

kerosene flame

oxy-acetylene flame

4. Zn + H2SO4 ➡ ZnCI2 + H2The rate of the above reaction will be greatly increased if...

the zinc is in the powered form

a greater volume of the acid is used

a smaller volume of the acid is used

the reaction vessel is immersed in an ice-bath

5. The mass of an atom is determined by

its ionization potential

its electrochemical potential

the number of protons

the number of neutrons and protons

6. Increasing the pressure of a gas

lowers the average kinetic energy of the molecules

decreases the density of the gas

decreases the temperature of the gas

increases the density of the gas

7. If an element has the electronic configuration 1s2 2s2 2p6 3s2 3p2 , it is

a metal

an alkaline earth metal

an s-block element

a p-block element

8. Which of the following separation processes is most likely to yield high-quality ethanol (>95%) from palm wine?

Fractional disllation without a dehydrant

Simple distillation without a dehydrant

Fractional distillation with a dehydrant

Evaporation

9. Number of molecules of water of crystallisation of the barium salt is2.5g of a hydrated barium salt gave on heating, 2.13g of the anhydrous salt. Given that the relative molecular mass of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is

10

7

5

2

10. Which of these shows a flaw in his report?In the preparation of some pure crystals of Cu(NO3)2 starting with CuO, a student gave the following statements as steps he employed.

Some CuO was reacted with excess dilute H2SO4

The solution was concentrated

When the concentrate was cooled, crystals formed were removed by filtration.

The crystals were washed with very cold water

11. Which of the following happens during the electrolysis of molten sodium chloride?

Sodium ion loses an electron

Chlorine atom gains an electron

Chloride ion gains an electron

Chloride ion is oxidized.

12. When sodium dioxonitrate (111) (HaNO2\) dissolves is

Exothermic

Endothermic

Isothermic

Isomeric

13. Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3)Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3) to give a gas which turns calcium chloride solution milky. X is

Na2SO4 (aq)

KI (ag)

An alkali

An acid

14. How many isomeric forms are there for the molecular formula C3H6Br2 ?

1

2

3

4

15. The three-dimensional shape of methane is

hexagonal

trigonal

linear

tertrahedral

Time is Up!

Time's up

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El Faraday says
May 31, 2021 at 2:36 pm
First time here 60% but any update on jamb
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