Chemistry Past Questions And Answers
The nucleus of a hydrogen atom consist of a?
- A. 1 proton only
- B. 1 proton, 2 neutron
- C. 1 neutron only
- D. 1 electron only
Which of the following compounds dissolves in water to form a solution with pH below 7?
- A. Sodium tetraoxosulphate (VI)
- B. Potassium hydroxide
- C. Ammonium chloride
- D. Sodium trioxocarbonate (IV)
Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday's law can be written as
- A. M = Z/Q
- B. M = Q/Z
- C. M = Z/2Q
- D. M = QZ
Which of the following increases as boiling water changes to steam?
- A. temperature of the system
- B. degree of disorder in the system
- C. number of molecules
- D. activation energy
The ideal gas laws and equations are true for all gases at
- A) low pressures and lower temperatures
- B) low temperatures and high pressures
- C) high pressures and high temperatures
- D) low pressure and high temperatures
A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
- A) a spontaneous reaction
- B) an endothermic reaction
- C) an exothermic reaction
- D) a reversible reaction
The boiling of fat and aqueous caustic soda is referred to as
- A) hydrolysis
- B) esterification
- C) acidification
- D) saponification
50cm3 of sulphur (IV) oxide, 800 cm3 of ammonia, 450 cm3 of hydrogen chloride, 1.0 cm3 of at 15°C. Which of the following is suitable for demonstrating the fountain experiment?
- A. Sulphur (IV) oxide hydrogen chloride
- B. Carbon (IV) oxide and amonia
- C. Amonia and hydrogen chloride
- D. Carbon (IV) oxide and surphur (IV) oxide
The IUPAC name for CH3CHCH3CHCLCHCH3CH2CH3 is
- A. 2, 4 - dimethyl - 3 - chlorohexane
- B. 3, 5 - dimethyl - 4 - chlorohexane
- C. 4 - chloro - 3, 5 - dirnethylhexane
- D. 3 - chloro - 2, 4 - dimethylhexane
The complex salt formed when aluminium dissolves in sodium hydroxide solution is
- A. NaAl(OH)4
- B. NaAl4(OH)4
- C. NaAl(OH)3
- Na3Al(OH)4