PRACTISE QUESTIONS FOR SS2

Oil spillage could cause

• Soil pollution only
• water pollution only
• water and soil pollution
• air, water and soil pollution

An organic compound with molecular mass 2 has an empirical formula CH. What is its molecular formula? (H = 1, C = 12)

• C₈H₈
• C₆H₆
• C₂H₂
• CH

Consider the following reaction: 2HCl(aq) + CaCO₃ (s) → CaCl₂ (aq) + CO₂ (g) + H₂O(l) What happens to the frequency of collision between the calcium ions and the chloride ions as the reaction progresses? It would

• remain the same
• increase
• decrease
• double

Exhaust fumes discharged from an electric generator gradually become invisible as a result of

• combustion
• adsorption
• emission
• diffusion

The mass of water of crystallization in 1 mole of MgSO₄.6H₂O is (H = 1, O = 16)

• 18
• 108
• 126
• 246

How many Faradays would be required to discharge one mole of oxygen gas?

• 4
• 3
• 2
• 1

An increase in the kinetic energy of particles occurs in a reaction if

• a catalyst is added
• fine particles are used
• temperature is increased
• concentration is increased

Which of the following reagents is used to distinguish between Al³⁺ and Zn²⁺?

• Ca(OH)₂
• HNO₃
• NaOH
• NH₃

Which of the following representations of a cell reaction is correct?

• Zn(s)/Zn²⁺(aq)//Cu(s)/Cu²⁺(aq)
• Zn(s)/Zn²⁺(aq)//Cu²⁺(s)/Cu(aq)
• Zn²⁺(s)/Zn(aq)//Cu²⁺(s)/Cu(aq)
• Cu²⁺(s)/Cu(aq)/Zn(aq)/Zn²⁺(s)

The following compounds are soluble in water except

• lead tetraoxosulphate(VI)
• sodium trioxocarbonate(IV)
• silver trioxonitrate(V)
• zinc chloride