Which of the following statements is NOT correct?

A. The average kinetic energy of a gas is directly proportional to its temperature

B. At constant tempearture, the volume of a gas increases as the pressure increases

C. The pressure of a gas is inversely proportional to its volume

D. The temperature of a gas is directly proportional to its volume

E. The collisions of molecules with each other are elastic

The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?

A. Mg⁺

B. K⁺

C. CO₂^2-

D. HCO₃

A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?

A. S dissolves in the solution

B. crystals of R are precipitated

C. there is no observable change

D. R and S react to generate heat

Which of the following dilute solutions has the lowest pH value?

A. Calcium trioxocarbonate (IV)

B. Sodium trioxocarbonate (IV)

C. Hydrochloric acid

D. Ethanoic acid

Which of the following in aqueous solution is neutral to litmus?

A. NH₄CI

B. NaCO₃

C. FeCl₃

D. NaCl

What volume of a 0.1 M H₃PO₄ will be required to neutralize 45.0 cm³ of a 0.2 M NaOH?

A. 10.0 cm³

B. 20.0 cm³

C. 27.0 cm³

D. 30.0 cm³

Which of the following substances is a basic salt?

A. Na₂CO₃

B. Mg(OH)CI

C. NaHCO₃

D. KSO₄.AI₂(SO₄)₃,24H₂O

Which of the following acts both s a reducing and an oxidizing agent?

A. H₂

B. SO₂

C. H₂S

D. C

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

A. Cu²⁺ + 2e^- → Cu(s)

B. 2Cl^- -2e → Cl₂

C. Cu_(s) -2e → Cu²⁺_(aq)

D. Cu²⁺_(aq) + 2Cl^-_(aq) → CuCl_2(aq)