2022 NECO CHEMISTRY ANSWERS - Verified 2022 NECO EXAM Chemistry Questions and Answers

CHEMISTRY-Objective

1EECBBAEBBB

11DDDBEAEABB

21DBECCDAAAB

31BADCBACDAC

41CECCEADBDC

51CEBEEDDBAE


Completed!.

====================================



Chemistry-THEORY

(4a) 

(i)Enthalpy of combustion can be defined as the amount of heat evolved when one mole of a substance burns in air or oxygen


(ii) Isomerism can be defined as a phenomenon in which organic compounds are having the same molecular formula but different structural formula


(4bi) 

NO2 - Acidic oxide

CO - Neutral oxide 

Fe2O3 - Basic oxide

Al2O3 - Amphoteric oxide 


(4bii)

(i)Nitrous oxide

(ii)Carbon (iv) oxide


(4c)

(i) Fractional distillation of liquid air 


(ii) 2KNO3 -----> 2KNO2(s) + O2(g)


(NH)CO3(s) ------>2NH3(g) + CO2(g) + H2O(g)


(iii) No. of molecules = 4/16 × 6.02 × 10²³

= 1.5 × 10²³


(4di)

(i)Sodium

(ii)Potassium


(4dii)

(i)Carbon (iv) oxide

(ii)Carbon


(4diii) 

(i)Hydration

(ii)Oxidation

====================================


(5ai)

Gay Lussac's states that when gaese react, they do so in volume which bear a simple whole number ratio to one another and to the volume of their products.


(5aii) 

2CO + O2 ----> 2CO2

  2 1 2    

100cm³ 70cm³ 100cm³


Total volume = 100+70+100 = 270cm³


(5bi)

(i)It is used in the production of other chemical substances

(ii)It is used as a drying or dehydrating agent 


(5bii)

(i) ZnCO3 -----> ZnO + CO2


->Conditions<-

- High temperature

- High pressure

 

(ii) ZnO + H2SO4 ----> ZnSO4 + H2


->Conditions<-

- Catalyst

- Surface area


(5biii)

(i) Crystallization method

(ii) By heating the ZnSO4 with an alkali metal carbonate 


(5c)

(i) This is due to the presence of extra electrons not used for bonding graphite 

(ii) This is because sodium salts are soluble and double decomposition is used for the production of insoluble salts 

(iii) It is an alkali substance ie possesses basic properties


(5di)

(i)Bitumen coal 

(ii)Peat coal


(5dii)

Fractional distillation

====================================


(2ai) 

(i)Molecules of gases are in constant random motion

(ii)The collision of gases is perfectly elastic

(iii)An increase in temperature leads to an increase in the average kinetic energy of the molecules of gases


(2aii)

(i)They both turn blue litmus paper red

(ii)They both dissolve in water to produce an acid 


(2aiii) 

Copper


(2aiv)

Copper 


(2bi)

Activation energy can be defined as the minimum energy required for a reaction to occur.


(2bii)

Catalyst lowers activation energy


(2biii)

Nikel


(2biv) 

(i)Sodium trioxocarbonate (iv)

(ii)Hydrogen gas 


(2ci)

(i)It reacts with metals to liberate hydrogen

(ii)It reacts with base to produce salt and water only


(2cii)

(i) 2KI + 2Cl2 ----> 2Kl2 + I2


(ii) 2Zn + Cl2 -----> 2ZnCl


(2ciii)

Cl2


(2civ)

Covalent bond


(2d)

(i) Butane 

(ii) Propene

(iii) Ethanol

(iv) Ethyne

====================================


(1ai)

(i) Base has bitter taste 

(ii) Base is soapy to touch 

(iii) Base turns litmus paper blue


(1aii)

The steps involved are:

(i)Shift conversion

(ii)Removal of carbon (iv) oxide

(iii)Steam reforming


(1aiii)

Cracking is the process by which heavier hydrocarbon molecule is splitted into two or more lighter molecules


(1aiv)

Thermal cracking


(1bi)

P ion = 1s²2s²2p⁶


(1bii)

Formula of chloride is Pcl2


(1biii)

Reducing agent

This is because it undergoes oxidation by losing electrons


(1ci)

Electron affinity is the energy released when a gaseous atom gains an electron to form a gaseous negative ion.


(1cii)

This is because it has lone pairs of electrons 


(1di)

(i) By adding a catalyst


(ii) FeS(s) + 2HCl(g) -----> FeCl(g) + H2S(s)


Xg = ?

No. of FeCl2 = 127g/mole

No. of FeS= 88g/mole


Mole = Mass/ No. of Mass = 3.2/127 = 0.025mole of FeCl2


By comparison,

1 mole of FeS = 1 mole of FeCl2

X moles of FeS = 0.025 of FeCl2

X = 0.025mole of FeS


Recall,

Mass = Mole * molar mass

Mass = 0.025*88

Mass = 2.2g of FeS

X = 2.2g


(1dii)

(i)Chlorofluorocarbons

(ii)Ammonia

====================================


(3)

2022 NECO CHEMISTRY ANSWERS 2022 NECO EXAM Chemistry  Questions and Answers NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry  Questions and Answers


2022 NECO CHEMISTRY ANSWERS 2022 NECO EXAM Chemistry  Questions and Answers NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry  Questions and Answers

======================================

(6)

2022 NECO CHEMISTRY ANSWERS 2022 NECO EXAM Chemistry  Questions and Answers NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry  Questions and Answers


2022 NECO CHEMISTRY ANSWERS 2022 NECO EXAM Chemistry  Questions and Answers NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry  Questions and Answers


Completed!!!



NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry Questions and Answers

Questions Students ask about 2022 NECO EXAM Chemistry Questions and Answers

  • How to get 2021 Chemistry NECO QUESTION AND ANSWERS? To get 2022 NECO CHEMISTRY ANSWERS, all you need to do is to visit gistpower.com with the pin sent to you by the admin and login. With the pin, you can have a full access to 2022 NECO CHEMISTRY ANSWERS

  • When do I get Verified 2021 Chemistry NECO QUESTION AND ANSWERS? You will get 2022 NECO CHEMISTRY ANSWERS a night to the exam because Chemistry is an important subject.

  • After using 2021 Chemistry NECO ANSWERS, How many am I assured of in Chemistry? You will score between 7A - 9A in Chemistry if you write verbatim 2022 NECO CHEMISTRY ANSWERS.

  • How verified is your 2021 Chemistry NECO ANSWERS? Our 2022 NECO CHEMISTRY ANSWERS is 100% verified and legit and it is worthy to be trusted because it from gistpower.com which is the most trusted website for exam runs in Nigeria.

  • Where do I get 2021 Chemistry NECO QUESTION AND ANSWERS? You can get 2022 NECO CHEMISTRY ANSWERS only from gistpower.com

  • Is the answers on this page actually the main 2022 NECO CHEMISTRY ANSWERS? No, This is 2021 NECO CHEMISTRY ANSWERS, to get 2022 NECO CHEMISTRY ANSWERS, you need to subscribe with us.

  • How do I subscribe for 2021 Chemistry NECO Questions & ANSWERS? To subscribe for 2021 Chemistry NECO Questions & ANSWERS, Message 07058713598 starting that you need 2021 Chemistry NECO Questions & ANSWERS a day to the exam.
gistpower.com answers

NECO Chemistry Questions and Answers 2022. NECO Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, 2022 NECO CHEMISTRY ANSWERS. 2022 NECO EXAM Chemistry Questions and Answers

We Need only 160 Candidates for this Year Jamb Cbt Runs. Only few slot left.


Beware of Scammers.... Please always use 07058713598 for all your transactions to avoid being scammed.
NOTE: Any answer that does not have badge can be chnaged, removed or updated anytime. The badge means that the answers have been verified 100% (if used exactly, you're to get nothing but A1) while without the badge means that the answer is still under verification. If you're not in a hurry, please wait for answer to be verified before you copy.
Click on the drop down links to view answer under them.
Good Luck... Invite family and friends to gistpower.com... We are the best and we post, others copy from us.











We Need only 160 Candidates for this Year Jamb Cbt Runs. Only few slot left.. Also note that Our 2022 WAEC GCE FIRST SERIES Midnight Answers Subscription ends on Tue 25th Jan 2022. Note: we don't accept calls. Please, we beg you in the name of God, do all your daily subscriptions AT LEAST a day before the exam, we may not have time to attend to you for daily subscriptions on the exam day.