¶¶ NABTEB GCE 2017 Chemistry Obj and Essay Answer — Nov/Dec Expo

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*NABTEB CHEMISTRY OBJ AND THEORY*


  1-10 BDCACCCBDD

11-20 BCCCBADAAC

21-30 CCDBADACBC

31-40 CDDCAACCBD

41-50 DBCADBACBA




(1ai)


In a degenerated orbital there are no two electrons that can have the same four

Quantum numbers.


(1aii) 


An ionic bond involves the loose and gain of electrons.  




A covalent bond involves the sharing of electrons by two atoms where both atoms contribute.


A dativ bond involves sharing of electrons but only one atom contribute the electrons to be shared 


(1bi) 


Periodic law states that atoms are arranged in order Of increase in their atomic number


(1bii) 


- Does not form common compounds  - k10


- liberates hydrogen from cold water - J3


- Are halogens - N17


- Are in the same group - J31L13


- Forms ions by loss of three electrons - L13 


(1c) 


- Water


- Ammonia - Triangular pyramid 


- Methane - Tetrahedral 


- sulphur (iv) oxide - linear



======≈=======================

2ai) Land of Constant Composition => State that All fire complies of a particular chemical compound contains the same elements combined in the same proportion by mass.


2bi) Amphoteric Oxide: Are oxide of metals which can behave both  as basic oxide and Acidic oxides, i.e they can treat with both acids and  alk all is to form salts and water only.


2biii)(i) Basic oxide eg Nao

ii) Acidic oxide Eg Co2


2c Ideal Gas

i) change in Temperature 

ii) Variation In Earth Gravitation 

iii) Gas Forms a liquid =Condensation 

iv) Liquid Form a Gas= Evaporation 

V) Gas Forms a solid = suldimation


2c) The condition Are

i) High Pressure 

ii) LOW Temperature



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


(3ai) 


Allotropes are atoms of the same element in the same physical state but in different forms. 


(3aii) 


*TABULAR FORM*


Diamond          |        Graphite

Transparent.    |        Blank

Very strong solid  |  Soft solid 

Octahedral shape  |  Hexagonal shape



(3aii) 


Diamond  -> For cutting glass 

                       For drilling limestones 


Graphite  ->   For making pencils

                        For lubricating metals



(3bi) 


An, electrolytic cell is made up of an electrolyte, electrodes and sources of electricity where the electrolyte decomposes.



(3bii) 


2 Faraday deposits 63.5g of copper

i.e 2x96500c deposits  63.5g of copper


298,500c deposits  Xg of copper


X = 298,500x63.5 / 2x96500

=98.211g


(3ci) 


A reducing agent is the substance that is oxides in a redox reaction


(3cii) 


They will turn purple permanent to pink. 


(3ciii) 


-  Pipeline product manufacturing company in portharcourt 


-  Dangote cement in lokoja



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



(4ai) 


A saturated solution contains the maximum amount of solute that the solvent can take at a particular temperature.


(4aii)


A dilute solution contains more solution that solute contain at a temperature.


(4aiii) 



A super saturated solution contains more than enough solute than the solvent can contain at the temperature. 


(4b) 


Iodine  - 

Chlorine - For killing micro organisms 

Alum - For coagulation 


(4ci) 


It reacts with water to form acid


It changes blue litmus paper to red

It reacts with ammonia gas to form salt. 


(4cii) 


As an oxidising agent because it reduced to nitrogen gas. 


As an acidic oxide because the product formed are salt and water only.


(4di) 


Disco sulphate(iii) acid - Hso2


(4dii)  C2HSOH ------->CH3COOH+H20


(4diii) 


C2HSOH  -------> C2H4+H20

GOODLUCK!!!

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