A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

A. KClO₄

B. KClO

C. KClO₂

D. KClO₃

The formula CH₂ for ethanoic acid is regarded as its

A. Molecular formula

B. General formula

C. Empirical formula

D. Structural formula

A little quantity of trichloromethane (b.pt 60,^oC) was added to a large quantity of ethanol (b.pt 78,^oC). The most probable boiling point of the resultant mixture is from

A. 69 ^oC - 70 ^oC

B. 70 ^oC – 74 ^oC

C. 82 ^oC – 84 ^oC

D. 60 ^oC – 78 ^oC

The chromatography separation of ink is based on the ability of the components to

A. React with solvent

B. React with each other

C. Dissolve in each other in the column

D. Move at different speeds in the column

In the reaction E+F ↔ G+H, the backward reaction is favoured if the concentration of

A. F is increased

B. E is increased

C. E is reduced

D. G is reduced

What amount of mercury would be liberated if the same quantity of electricity that liberates 0.65g of zinc is applied?

A. 2.01g

B. 1.00g

C. 4.02g

D. 8.04g

Which of the following equations show that a reaction is in equilibrium?

A. ΔG < O

B. ΔG = ΔH – TΔS

C. ΔG > O

D. ΔG = O

PCl_5(g) ↔ PCl_3(g) + Cl_2(g)
In the reaction above, a decrease in pressure will

A. Decelerate the reaction

B. Increase the yield of PCl₃

C. Increase the yield of PCl₅

D. Accelerate the reaction

When H2S is passed into a solution of iron (III) chloride, the solution turns

A. Pale green

B. Pale red

C. Brown

D. Colourless

The Arrhenius equation expresses the relationship between the speed of a reaction and its

A. Molecular collision

B. Heat of reaction

C. Catalyst

D. Activation energy