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University of Calabar Chemistry Post Utme Past Questions and Answers

University of Calabar Chemistry Post Utme Past Questions


Question 16 :



Separation of different carotenes from carrot root uses a method ____________

A. Centrifugation
B. Distillation
C. Chromatography
D. Carotinization


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Question 17 :



\begin{array}{|l|c|c|c|c|}
\hline Solution & W & \(X\) & \(Y\) & \(Z\) \\
\hline \(P h\) & 8 & 12 & 4 & 2 \\
\hline
\end{array}
From the table, which of the solutions W, C, Y and \(Z\) will liberate carbon (IV) oxide from a trioxocarbonate (IV) salt?

A. \(Z\)
B. Y
C. \(W\)
D. \(X\)


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Question 18 :



\(50 cm ^{3}\) of a saturated solution of \(KNO _{3}\) at \(40^{\circ} C\) contained \(5.05 g\) of the salt. What is the solubility of \(KNO _{3}\) at \(40^{\circ} C [ K =39, N =14, O =16]\)

A. \(1.0 moldm ^{-3}\)
B. \(1.5 moldm { }^{-3}\)
C. \(2.0 moldm ^{-3}\)
D. \(5.0 moldm\)


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Question 19 :



A brand of ink containing cobalt (III), copper (II) and iron(II) ions can best be separated into its various components by

A. Fractional crystallization
B. Fractional distillation
C. Sublimation
D. Chromatography


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Question 20 :



If the rate law obtained for a given reaction is given as rate \(= [K X]^{n}[ Y ]^{n}\), what is the overall order of the reaction.

A. \(n m\)
B. \(n / m\)
C. \(n+m\)
D. \(n-m\)


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