The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is

• A. CO, CO₂ and SO₂
• B. CO, HCL and SO₂
• C. CO, CO₂ and HCL
• D. SO₂, CO2 and HCL

The volume occupies by 1.58g of a gas at s.t.p is 500cm³. What is the relative molecular mass of the gas? (G.M.V at s.t.p = 22.40dm³)

• A. 28
• B. 32
• C. 44
• D. 71

The following steps are scientific methods except

• A. experimentation
• B. problem identification
• C. Analysis
• D. Open-mindedness

Which of the following organic compounds can undergo both addition and substitution reactions?

• A. Pentane
• B. Benzene
• C. Propane
• D. Hexane

Which of the following statements is FALSE about isotopes of the same element?

• A. They have the same number of electrons in their outermost shells
• B. They have different atomic masses
• C. They have the same atomic number and the number of electrons
• D. They have the same atomic number but different umber of elelctrons

Which of the following is a form of calcium carbonate? I. limestone II. marble III. chalk Iv. egg-shells

• A. I only
• B. I, II and IV
• C. I and II only
• D. I, II, III, and IV

Polyvinyl chloride is used to produce

• A) bread
• B) pencils
• C) ink
• D) pipes

Which of the following pollutants is biodegradable ?

• A. Sewage
• B. Plastics
• C. Metal scrape
• D. Lead compounds

What is the concentration of OH ions of an aqueous solution of pH 4.4?

• A)
  9.600 \(\times\) 10\(^{-10}\) moldm\(^{-3}\)
• B)
  2.512 \(\times\) 10\(^{-10}\) moldm\(^{-3}\)
• C)
  9.600 \(\times\) 10\(^{10}\) moldm\(^{-3}\)
• D)
  2.512 \(\times\) 10\(^{10}\) moldm\(^{-3}\)

In which of the following compound (s) will heat be absorbed on adding water? l. KNO₃ II. Concentrated H₂ SO₄ III. NH₄CI

• A. I only
• B. lll only
• C. l and lll only
• D. ll and lll only