Post Utme Chemistry Past Questions and Answers

Question 826:

A blue solid, \(T\), which weighed \(5.0 g\) was placed on a table. After 8 hours, the resulting pink solfd was for ind to weigh \(5.5 g\) it can be inferred that substrate \(T\).

A. Is deliquescent
B. Is hydroscopic
C. Fas some molecule of water of crystallization
D. Is efflorescent

Question 827:

The effluent of an industrial plant used plant used in the electrolysis of concentrated brine, thithal flowing mercury cathode may contain impurities like
( Cu =63.5 ; S =32, O =16)

A. Oxygen
B. Hydrogen
C. Mercury(II) chlorine
D. Hydrogen chloride

Question 828:

The solubility in moles per \(dm ^{3}\) of \(20 g\) of \(CuSO _{4}\) dissolved in \(100 g\) of wate \({ }^{2}+180^{\circ} C\) is ____________
( Cu =63.5 ; S =32, O =16)

A. \(0.13\)
B. \(0.25\)
C. \(1.25\)
D. \(2.00\)

Question 829:

Smoke consists of ____________

A. Solid particle dispersed in liquid
B. Solid particles dispersed in gas
C. Gas or liquid particles dispersed in liquid
D. Liquid particles dispersed in liquid

Question 830:

\(Na _{2} C _{2} O _{4}+ CACl _{2} \rightarrow CACO _{2} O _{4} NaCl\). Given a solution of \(1.9 g\) of sodiumpoxalate in \(50 g\) of water at room temperature, calculate the minimum volume of \(0.1\) M-calcium chlorige required to produce maximum calcium oxalate using the above equation

A. \(1.40 \times 10^{2} dm ^{3}\)
B. \(1.40 \times 10^{2} dm ^{3}\)
C. \(1.40 \times 10^{-2} dm ^{3}\)
D. \(1.40 \times 10^{-2} dm ^{3}\)