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Post Utme Chemistry Past Questions and Answers

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Post Utme Chemistry Past Questions

Question 946:


The standard reduction potentials for the following halfcell reactions are,
\(2 H _{2} O _{(j)} \rightarrow O _{2(k)}+4 H _{((4)}^{+}+4 eE ^{\circ}=-1.23 V\)
\(2 H _{2} O _{20)} \rightarrow 2 O _{2(e)}+4 H _{(a q)}^{-}+4 eE ^{\circ}=-0.68 V\)
What is the \(E ^{\circ}\) for the reaction above?
\(2 H _{2} O _{2(D}=2 H _{2} O _{( l )}+ O _{2( g )}\) at \(298 K\) ?

A. \(-0.68\)
B. \(-1.23 V\)
C. \(+0.55 V\)
D. \(+1.91 V\)


Question 947:


The energy for the dissociation of molecule \(A B\) in \(kJ\) in the diagram of energy against the reaction coordinate shown below is, ____________

A. \(X\)
B. \(-Y\)
C. \(X-(-Y)\)
D. \(-(X+Y)\)


Question 948:


Bonding in ammonium chloride is ____________

A. Ionic, covalent and dative
B. Ionic and covalent
C. Covalent and dative
D. Ionic


Question 949:


A physical change is exemplified by the ____________

A. Burning of bush
B. Rusting of a metal
C. Dissolution of calcium in water
D. Heating of ammonium chloride


Question 950:


The number of neutrons in the deuterium atom is/are ____________

A. O
B. 1
C. 2
D. 3






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