chemistry

The residual solids from the fractional distillation of petroleum are used as

• coatings of pipes
• raw materials for the cracking process
• fuel for the driving tractors
• fuel for jet engines

Which of the following is used as fuel in miners' lamp?

• Ethanal
• Ethyne
• Ethene
• Ethane

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of

• CO
• Cl-
• SO₂
• NO₂

The graph above demonstrate the effect of

• surface area on the rate of reaction
• catalyst on the rate of reaction
• pressure on the rate reaction
• concentration on the rate of reaction

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + energy The reaction above is catalysed by zymase at 25⁰C is represented by the equation above is useful in the production of

• propanol
• butanol
• methanol
• ethanol

Which of the following compound is used as a gaseous fuel?

• CH₃ –C=CH
• CH₃(OH) –CH₂ –CH₃
• CH₃ –CH₂ –CH₂ –COOH
• CH₃ –CH₂–CH₂ –CH₃

How many atoms are present in 6.0g of magnesium? [Mg = 24, NA = 6.02 x 10²³mol-1]

• 1.20 x 10²²
• 1.51 x 10²²
• 2.41 x 10²³
• 3.02 x 10²³

The IUPAC nomenclature of the compound LiAlH₄ is

• lithiumtetrahydridoaluminate (III)
• aluminium tetrahydrido lithium
• lithium aluminium hydride
• tetrahydrido lithium aluminate (III)

Iron can be protected from corrosion by coating the surface with

• gold
• silver
• copper
• zinc

Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?

• neutralization with NaOH followed by filtration
• neutralization with NaOH followed by distillation
• fractional distillation
• filtration followed by distillation