Jamb Chemistry Past Questions For Year 2018
Question 61
An element X forms the following compounds with chlorine; XCl\(_4\), XCl\(_3\), XCl\(_2\). This illustrates the
- A. law of multiple proportions
- B. law of chemical proportions
- C. law of simple proportions
- D. law of conservation of mass
Question 62
Which of the following metals cannot replace hydrogen from water or steam?
- A. Sodium
- B. Magnesium
- C. Iron
- D. Copper
Question 63
The conductivity of an acid solution depends on the
- A. amount of ions present and their mobilities
- B. mobilities of the ions present
- C. amount of ions present
- D. temperature of the solution
Question 64
Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?
- A. Spring water
- B. River water
- C. Tap water
- D. Sea water
Question 65
Aluminium does not react with either dilute or concentrated trioxonitrate (V) acid because
- A. it is insoluble in either dilute or concentrated trioxonitrate (V) acid
- B. it is lower than hydrogen in the electrochemical series
- C. the reaction with trioxonitrate (V) acid has a light activation energy
- D. an insoluble oxide is formed on its surface which renders it passive
