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Chemistry-Obj!
1ACBBDADCAD
11BCACCAABBB
21DBDCACBCAA
31CDACBBDBDD
41ACCBCDCDCC

Chemistry-Obj
(1)

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(5)

(5rest)

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(2a)

(2b)

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(3ai)
¹³R, ⁸Q
¹³R=1s²,2s²,2p⁶,3s²,3p¹
⁸Q=1s²,2s²,2p⁴

(3aii)
¹³R=2,8,3
Valency of ¹³R is 3
⁸Q= 2,6
Valency of ⁸Q=2

(3di)
2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)

(3dii)
Sodium teraoxosulphate (iv) salt and water

(3diii)
The resulting solution NaSO4 is basic and will have no effect on litmus paper

(3div)
When heated to dryness it can be used as a dehydrating agent

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2020 WAEC GCE CHEMISTRY ESSAY & OBJECTIVE Questions and Answers

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