Waec Chemistry CBT Quiz - FlashLearners

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...

Sweet-smelling Compound W. The Compound W is:

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the element C, H, and O in the atomic ratio 1:2:1. The compound has aÂ sweet taste and melts on heating. In the presence of yeast and in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a €˜pop€™ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet-smelling compound W.

A Soap

An Oil

An Alkane

An Ester

The alkanol obtained from the production of soap is

ethanol

glycerol

methanol

propanol

The mass of an atom is determined by

its ionization potential

its electrochemical potential

the number of protons

the number of neutrons and protons

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

Which of the following is neutralization reaction?

Addition of chloride solution

Addition of trioxonirate (V) acid (nitric acid) to distilled water.

Addition of trioxonirate (V) acid (nitric acid) to tetraoxosulphate (V1) acid (sulphuric acid).

Addition of trioxonirate (V) acid (nitric acid) potassium hydroxide solution

Number of molecules of water of crystallisation of the barium salt is

2.5g 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

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.

The molecular formula of X is

C12H22O11

C6H12O6

C3H6O3

C7H14O7

The colour imparted to a flame by calcium ion is

green

blue

brick-red

yellow

10.

The cracking process is very important in the petroleum industry because it

gives purer products

Yields more lubricants

Yields more asphalt

11.

Which set-up in the following for the extraction of iron copper and Aluminum is correct?

Some metals are extracted from their ores after some preliminary treatments by electrolysis (L) some by thermal reaction(T) and some bya combination of both processes(TL).

Iron (L), copper (L) m aluminum(T)

Iron (T), copper (L), aluminum (T)

Ion (TL), copper (TL), aluminium(TL)

Ion (T), copper (L), aluminium (TL)

12.

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

13.

A jet plane carrying 3,000 kg of ethane burns off all the gas-forming water

A jet plane carrying 3,000 kg of ethane burns off all the gas-forming water and carbon dioxide. If all the carbondioxide is expelled and the water formed is condensed and kept on board the plane, then the gain in weight is

1,800kg

900kg

600kg

2,400kg

14.

Which of these metals, Mg, Fe, Pb, andCu will dissolve in dilute HCI?

All the metals

Mgm Fe, and Cu

Mg, Fem and Pb

Mg and Fe only

15.

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

Time is Up!

Time's up

Get WAEC App

» Over 28,000 Waec Questions Offline
» Waec Competition To Win N30,000
» Waec Literature Novels And Questions
» Free SSCE Videos For All Topics

Quiz Instructions:

Click On Next To Begin
Read Each Question And Choose Your Answer
Scroll Down To See Next Question(s)
Scroll Up To See the Previous Question(s)
Click On Submit to Finish Quiz
Wait for your Quiz Score
View Correct Answers and Explanations
Watch Videos to Boost your Score
You can Restart Quiz As Many Times As You Like.

Hope you found this helpful? Feel free to share with others and don’t fail to let me know how you feel using the Comment box. You may Check here to Take Another Quiz.

Comments

Barinaale Dogala says

It’s helpful alot rather

Reply
Barinaale Dogala says

It’s so good
It helpful alot

Reply
Ayomide oyedele says

It was helpful

Reply
EMMANUEL RIMAMSITSE says

JAM QUESTION

Reply

Quiz Instructions:

About FlashIsaac

Comments

Leave a Reply Cancel reply