A metal (M) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue.

(a) Name the metal (M).
(b) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water.

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Solution

(a) Sodium is metal which stored under kerosene. (1 Mark)
(b) Sodium is the most reactive metal and react with oxygen in the air at room temperature to form the oxide. (1 Mark)
$4 Na$ + $O_{2}$ → ${2Na}_{2}$ $O$ (1 Mark)
Reaction with water gives sodium hydroxide.
${Na}_{2}$ $O$ + $H_{2}$ $O$ → $2 NaOH$ (1 Mark)

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A metal E is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water it turns red litmus to blue : (i) Name the metal E. (ii) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. (iii) Explain the process by which the metal is obtained from its molten chloride.

A metal $E$ is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue:
(i) Name the metal $E$ .
(ii) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water.
(iii) Explain the process by which the metal is obtained from its molten chloride.

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(a) Sodium is metal which stored under kerosene. (1 Mark) (b) Sodium is the most reactive metal and react with oxygen in the air at room temperature to form the oxide. (1 Mark) 4 Na + O2 → 2Na2O (1 Mark) Reaction with water gives sodium hydroxide. Na2O + H2O →2 NaOH (1 Mark)