Chemistry Past Questions And Answers
831
The basicity of CH3COOH is
- A. 1
- B. 2
- C. 3
- D. 4
832
Duralumin consists of aluminium, copper, ?
- A. zinc and gold
- B. lead and maganese
- C. nickle and silver
- D. manganese and magnesium
833
Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?
- A. The bonds in the reacting molecules are more readily broken
- B. The molecular collisions become more violent
- C. A lower proportion of the molecules has the necessary minimum energy to react
- D. The collision frequency of the molecules increase
834
When platinum electrodes are used during the electrolysis of copper (II) tetraoxosulphate (IV) solution, the solution gets progressive
- A) acidic
- B) basic
- C) neutral
- D) atmospheric
835
Synthesis gas is a mixture of
- A. CH4 and H2O
- B. CH4 and H2
- C. CO2 and H2
- D. CO and H2
836
In the electrolysis of brime, the anode is
- A) carbon
- B) platinum
- C) zinc
- D) copper
837
Which of the following products of biotechnology can be used as a fuel in place of petrol?
- A. Butane
- B. Ethanol
- C. Ethene
- D. Propanol
838
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
- A. magnesium and zinc
- B. magnesium and calcium
- C. copper and zinc
- D. lead and calcium
839
What is the trend for ionization energy across a period in the periodic table?
- A. Increases from left to right.
- B. Remains constant
- C. Varies randomly
- D. Decreases from left to right
840
How many isotopes has hydrogen?
- A. 1
- B. 3
- C. 5
- D. 7