Which one of the following minerals is used as a fuel in nuclear power stations?

• Bauxite

• Quartz

• Feldspa

• Pitchblende

Which one of the following is NOT a synthetic detergent?

• CH₃(CH₂)₁₀CH₂OSO₃^-Na⁺

• [CH₃(CH₂)₁₅- N -(CH₃)₃]⁺BR^-

• CH₃(CH₂)₁₆COO^-Na⁺

• CH₃(CH₂)₁₆COO(CH₂CH₂O)_nCH₂CH₂OH

Which one of the following is an example of a clean fuel?

• Coke

• Propane

• Petrol

• Wax

Which one of the following metals does NOT react with cold water?

• Calcium (Ca)

• Potassium (K)

• Magnesium (Mg)

• Sodium (Na)

5.

In which of the following pairs are the ions isoelectronic?

• Mg²⁺, Ar

• Na⁺, O^2-

• AI³⁺, CI^-

• K⁺, Ne

Which one of the following is used as a binder in paints?

• Titanium dioxide

• Novolac

• Phthalocyanine

• Silicones

Basic scientific principle behind a nuclear reactor is

• Nuclear fusion

• Controlled nuclear fusion

• Uncontrolled nuclear fission

• Controlled nuclear fission

Which one of the following statements is NOT correct for the given reaction?

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)

• Iron is the reducing agent

• The solution turns green in colour after the reaction

• Copper is a more reactive metal than iron

• The reaction is an example of a redox reaction

Which one of the following is an organic acid?

• Hydrochloric acid

• Nitric acid

• Acetic acid

• Sulphuric acid

Dinitrogen (N₂) and dioxygen (O₂) are the main constituents of air but they do not react with each other to form oxides of nitrogen because:

• The reaction requires initiation by a catalyst

• Oxides of nitrogen are unstable

• The reaction is endothermic and requires very high temperature

• The stoichiometry of N₂ and O₂ in air is not ideal for the reaction to take place