MR 5 CHEMISTRY

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

• • A. CaCO3(s)→CaO(s)+(CO2(g)𝐶𝑎𝐶𝑂3(𝑠)→𝐶𝑎𝑂(𝑠)+(𝐶𝑂2(𝑔)

• • B. C(s)+O2(g)→CO2(g)𝐶(𝑠)+𝑂2(𝑔)→𝐶𝑂2(𝑔)

• • C. 3Fe(s)+2O2(g)→FeO4(s)𝐹𝑒(𝑠)+2𝑂2(𝑔)→𝐹𝑒𝑂4(𝑠)

• • D. SiO2(s)+CaO(s)→CaSiO3(s)𝑆𝑖𝑂2(𝑠)+𝐶𝑎𝑂(𝑠)→𝐶𝑎𝑆𝑖𝑂3(𝑠)

• • E. CO2(g)+C(s)→2CO(g)𝐶𝑂2(𝑔)+𝐶(𝑠)→2𝐶𝑂(𝑔)

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

• Tin

• Zinc

• Copper

• Lead

• Aluminium

Which of the following gases may not be dried with concentrated sulphuric acid?

• HCl

• N2

• Cl2

• SO2

• NH3

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

• ionic bond

• electrovalent bond

• covalent bond

• co-ordinate bond

• hydrogen bond

Which of the following is not a member of the homologous series of the paraffins (alkanes)?

• C3H8

• C5H12

• C7H16

• C15H32

• C24H48