2009 - JAMB Chemistry Past Questions and Answers - page 2

The major source of oxides of nitrogen (like NO and NO₂) is from the burning of fuels, especially in internal combustion engines and power plants. The high temperatures involved cause nitrogen and oxygen in the air to react.

The acid used in the electrolysis of water is dilute H2SO4 (sulfuric acid). Adding an electrolyte (like an acid or a base) increases the conductivity of the water. Sulfuric acid is a strong acid, and therefore it dissociates well in water, providing ions that allow the current to flow.

To solve this problem, we can use the following formula: Moles = Molarity × Volume (in Liters) We are given: * Molarity (M) = 1.5 M * Moles = 0.045 moles We need to find the volume. Rearrange the formula to solve for volume: Volume (in Liters) = Moles / Molarity Plug in the given values: Volume (in Liters) = 0.045 moles / 1.5 M = 0.03 L Convert Liters to cm³: 1 L = 1000 cm³ 0.03 L = 0.03 * 1000 cm³ = 30 cm³

Citric acid is a weak acid, and sodium hydroxide is a strong base. When a weak acid reacts with a strong base, the resulting salt will produce a basic solution.