Jamb cbt/Utme 2021 Chemistry Likely Quetions with answers options

The electronic configuration of an element is 1S2 2S2 2P6 3S2 3P3. How many unpaired electrons are there in the element?

A

5

B

4

C

3

D

2

 

Answer

 

2

Which of the following can be obtained by fractional distillation?

A

Nitrogen from liquid air

B

Sodium Chloride from sea water

C

Iodine from solution of Iodine in carbon tetrachloride

D

Sulphur from the solution of sulphur in carbon disulphide

 

Answer

 

3

Duralumin consists of aluminum, copper?

A

Zinc and Gold

B

Lead and Manganese

C

Nickel and Silver

D

Manganese and Magnesium

 

Answer

 

4

An example of a polysaccharide is?

A

Dextrose

B

Mannose

C

Glucose

D

Starch

 

Answer

 

 

5

8g of CH4 occupies 11.2 at S.T.P. What volume would 22g of CH3CH2CH3 occupy under the same condition?

A

3.7dm3

B

11.2dm3

C

22.4dm3

D

33dm3

 

Answer

 

6

The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

A

with cool running water

B

sodium hydroxide solution

C

iodine solution

D

sodium trioxonitrate(v) solution

 

Answer

 

7

Which of the gas laws does this graph illustrate?

A

Boyle

B

Charles

C

Gay-Lussac

D

Graham

 

Answer

 

8

What are the possible oxidation numbers of an element if its atomic number is 17?

A

-1 and 7

B

-1 and 6

C

-3 and 5

D

-2 and 6

 

Answer

 

 

9

What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

A

Steam distillation

B

Destructive distillation

C

Liquefication

D

Hydrolysis

 

Answer

 

10

Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?

A

Acid

B

Ester of alkanoic acid

C

Alkali

D

Alkanol

When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?

A

Oxyethene

B

Oxyhydrocarbon flame

C

Oxyacetylene flame

D

Oxymethane flame

 

Answer

 

12

Which of the following substances is a mixture?

A

Granulated sugar

B

Seawater

C

Sodium chloride

D

Iron filling

 

Answer

 

13

If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?

A

1.650atm

B

0.825atm

C

0.413atm

D

0.275atm

 

Answer

 

14

Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

A

P

B

Q

C

R

D

S

 

Answer

 

 

15

The products of the thermal decomposition of ammonium trioxonitrate(v) are?

A

Nitrogen (I) Oxide and Water

B

Ammonia and Oxide

C

Nitrogen and Water

D

Nitrogen (IV) Oxide and Water

 

Answer

 

16

How many valence electrons are contained in the element 1531P?

A

3

B

4

C

15

D

31

 

Answer

 

17

The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO3 is treated with 0.2dm3 of 1 Mole of HCL in the equation

CaCO3 + 2HCL ⇒  CaCl2  + H2 O + CO2  , is ?

A

1.00 X 1023

B

6.02 X 1023

C

6.02 X 1022

D

6.02 X 1024

 

Answer

 

18

The volume occupied by 1.58g of a gas at S.T.P is 500cm3. What is the relative molecular mass of the gas?  [ G.M.V at S.T.P = 22.4dm23 ]

A

28

B

32

C

44

D

74

 

Answer

 

 

19

Which of the following gases will rekindle a brightly splint?

A

  1. NO2

B

NO

C

N2O

D

CL2

 

Answer

 

20

The shape of ammonia molecule is?

A

Trigonal planar

B

Octahedral

C

Square planar

D

Tetrahedral

A few drop of conc HCL are added to about 10cm3 of a solution of PH 3.4. The PH of the resulting mixture is?

A

less than 3.4

B

greater than 3.4

C

unaltered

D

the same as that of the pure water

 

Answer

 

22

Chromatography is used to separate components of mixture which differ in their rates of ?

A

diffusion

B

migration

C

reaction

D

sedimentation

 

Answer

 

23

Deliquescent substances are also?

A

efflorescent

B

anhydrous

C

hygroscopic

D

insoluble

 

Answer

 

24

Helium is used in observation of ballons because it is?

A

Light and combustible

B

light and non-combustible

C

heavy and combustible

D

heavy and non-combustible

 

Answer

 

 

25

32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm3 of water generated 13.0kj of heat. The heat solution is?

A

26.0kj/mol

B

65.0kj/mol

C

130.0kj/mol

D

260.0kj/mol

 

Answer

 

26

A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?

[ M = 27, Cl = 35.5]

A

MCl

B

MCl2

C

MCl3

D

M2Cl6

 

Answer

 

27

What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?

A

24,125 C

B

48,250 C

C

72,375 C

D

96,500 C

 

Answer

 

28

Which of the following types of bonding does not involve the formation of new substances?

A

Metallic

B

Covalent

C

Co-ordinate

D

Electrovalent

 

Answer

 

 

29

An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?

A

Alkene

B

Alkanal

C

Alkanone

D

Alkanoic Acid

 

Answer

 

30

The substance often used for vulcanization of rubber is?

A

Chlorine

B

Hydrogen peroxide

C

Sulphur

D

Tetraoxosulphate(vi) acid

The chlorinated alkane often used industrially to remove grease is?

A

Tetrachloromethane

B

Chloromethane

C

Trichloromethane

D

Dichloromethane

 

Answer

 

32

What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?

A

8.0g

B

16.0g

C

36.0g

D

72.0g

 

Answer

 

33

Proteins in acid solution undergo?

A

Substitution

B

Fermentation

C

Hydrolysis

D

Polymerisation

 

Answer

 

34

The general formula for the Alkanals is?

A

R2CO

B

RCHO

C

ROH

D

RCOOR

 

Answer

 

 

35

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?

A

Bipolar

B

Negatively charged

C

Positively charged

D

Neutral

 

Answer

 

36

When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

A

Sublimation

B

Crystallization

C

Distillation

D

Evaporation

 

Answer

 

37

An electron can be added to a halogen atom to form a halide ion with?

A

8 valence electrons

B

7 valence electrons

C

2 valence electrons

D

3 valence electrons

 

Answer

 

38

Aluminum hydroxide is used in the dyeing industry as a?

A

Dye

B

Dispersant

C

Salt

D

Mordant

 

Answer

 

 

39

The most important element on the earth’s crust is?

A

Nitrogen

B

Hydrogen

C

Oxygen

D

Fluorine

 

Answer

 

40

To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?

A

Passed over heated copper(ii)oxide

B

Bubbled through water

C

Bubbled through conc H2SO4

D

Bubbled through conc NAOH

For Inquiry:

Call/Whatsapp: 07062277854

Facebook: Oliveloaded.com

Facebook Fan Page: Oliveloaded

© Mr Olive

TAGS; 2020 JAMB RUNZ (runz), JAMB CBT RUNS, JAMB CBT EXPO (Expo) SITE, EXAM RUNS, JAMB CBT 2020/2021 RUNS,2020 JAMB CBT CORRECT EXPO, JAMB CBT 2020 REAL EXPO/RUNZ, BEST 2020 JAMB CBT EXPO SITE.

 

The post Jamb cbt/Utme 2021 Chemistry Likely Quetions with answers options appeared first on Oliveloaded.com.

The post Jamb cbt/Utme 2021 Chemistry Likely Quetions with answers options appeared first on Oliveloaded.com.

Source: Post

Be the first to comment

Leave a Reply