WAEC 2019 CHEMISTRY THEORY/OBJ EXPO

 

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VERIFIED OBJ

1-10 BCCCDADACA

11-20DDCADCACBA

21-30DCA-BDDB-A 

31-40AACB-CDA-B

41-50BDCCCDBDDD

 CLICK HERE FOR CHEMISTRY ALT B SOLUTIONS

 CLICK HERE FOR CHEMISTRY ALT B SOLUTIONS

(2ai)

C10H22----->(cracking)---->C6H14 + C4H8

P is C4H8

(2aii)

H H H H

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H-C=C-C-C-H

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H H

H CH3 H

| | |

H-C= C- C-H

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H

(2aiii)

P would be polymerized because it contain double bond

(2b)

Hundi's rule:Electrons occupy each orbital singly first before pairing takes place in a degenerated orbital

Aufbau's principle:Electrons enter into orbitals in order of increasing energy

(2ci)

NaH-Ionic

H2-Covalent

H2S-Covalent

NH4Cl-Vanderwaals

(2cii)

NaH-Soluble(dissolves)

H2-Insoluble

H2S-Moderately soluble

NH4Cl-Soluble

(2d)

(i) Number of unpaired electrons is zero

(ii) J would be a good reducing agent

(iii)It is found in group 2, It is a metal and Metals are good reducing agent

(5ai)

DRAW THE DIAGRAM

(5aii)

(i)It is used in the sterilization of water for domestic and industrial use and in the treatment of sewage

(ii)It is used as a bleaching agent for cotton linen and wood-pulp

(5b)

Preparation of hydrogen from water gas:

This is called Bosch process: In this process large quantities of hydrogen are produced from cheap raw materials namely water and coke when steam is passed over red hot coke (carbon) at about 1200C, a mixture of carbon(II) oxide and hydrogen ion and water gas is produced .Excess steam is then mixed with the water gas and passed over a catalyst iron(III)oxide at 450C.As a result the carbon(II)oxide in the water gas is converted by CO2 with a further yield of hydrogen

Endothermic reaction

H2O(g) + C(s)---> CO(g)

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