Post Utme Chemistry Past Questions and Answers

Question 671:

An unknown organlc compound \(X\) has a relative molecular mass of 180 it is a colourless crystalline solld, readily soluble in water \(\mathrm{X}\) contains the element \(\mathrm{C}, \mathrm{H}\), and \(O\) in the atomlc ratio \(1: 2: 1\).

The compound has a sweet taste and melt on heating. In the presence of yeast and in the absence of alr \(X\) is converted to compound \(Y\) in the absence of air, \(X\) is converted to compound \(\mathrm{Y}\) and colourless gas. Compound \(\mathrm{Y}\) react with sodium metal to produce a gas \(Z\) which gives a "pop" sound with a glowing splint.

Y also reacts with ethanolc acid to give a sweet-smelling compound.

Compound \(W\) is ____________

A. A soap
B. An oil
C. An alkane
D. An ester
E. Sucrose

Question 672:

An unknown organlc compound \(X\) has a relative molecular mass of 180 it is a colourless crystalline solld, readily soluble in water \(\mathrm{X}\) contains the element \(\mathrm{C}, \mathrm{H}\), and \(O\) in the atomlc ratio \(1: 2: 1\).

The compound has a sweet taste and melt on heating. In the presence of yeast and in the absence of alr \(X\) is converted to compound \(Y\) in the absence of air, \(X\) is converted to compound \(\mathrm{Y}\) and colourless gas. Compound \(\mathrm{Y}\) react with sodium metal to produce a gas \(Z\) which gives a "pop" sound with a glowing splint.

Y also reacts with ethanolc acid to give a sweet-smelling compound.

The molecular formula of \(X\) is ____________

A. \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\)
B. \(\mathrm{C}_{16} \mathrm{H}_{12} \mathrm{O}_{6}\)
C. \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{AO}_{3}\)
D. \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\)
E. \(\mathrm{C}_{4} \mathrm{H}_{3} \mathrm{~A}_{4}\)

Question 673:

An unknown organlc compound \(X\) has a relative molecular mass of 180 it is a colourless crystalline solld, readily soluble in water \(\mathrm{X}\) contains the element \(\mathrm{C}, \mathrm{H}\), and \(O\) in the atomlc ratio \(1: 2: 1\).

The compound has a sweet taste and melt on heating. In the presence of yeast and in the absence of alr \(X\) is converted to compound \(Y\) in the absence of air, \(X\) is converted to compound \(\mathrm{Y}\) and colourless gas. Compound \(\mathrm{Y}\) react with sodium metal to produce a gas \(Z\) which gives a "pop" sound with a glowing splint.

Y also reacts with ethanolc acid to give a sweet-smelling compound.

Reaction of \(X\) formula the basic of the ____________

A. Plastic industry
B. Textile industry
C. Brewing industry
D. Dyeing industry
E. Soap industry

Question 674:

A mixture of common salt, ammonium chloride and barium. Sulphate can' best be separated by ____________

A. Addition of water followed by filtration then sublimation
B. Addition of water followed by filtration the sublimation.
C. Sublimation followed by sublimation then titration
D. Fractional distillation
E. Fractional crystallization

Question 675:

Which of the following relationship between the pressure p. the volume \(V\) and the temperature T. represents and ideal behaviours?

A. P&VT
B. P&TN
C. PT&V
D. PV&VT
E. P&V/T