Chemistry
Grade-8
Easy
Question
The true statement among the following is
- Combustion reactions always results in the formation of Oxygen and Carbon.
- The reactions in which heat is released is known as endothermic reactions.
- When sodium metal reacts with water, the reaction becomes more vigorous if warm water is added.
- Burning of coal, petrol and kerosene are the examples of endothermic reactions.
Hint:
Alkali metals react with water.
The correct answer is: When sodium metal reacts with water, the reaction becomes more vigorous if warm water is added.
- When sodium metal reacts with water, the reaction becomes more vigorous if warm water is added.
- Most metals do not react with water. However, alkali metals react vigorously with water. The reaction of sodium metal with water: Sodium metallic bureaucracy sodium hydroxide and liberates hydrogen fuel line in conjunction with a lot of warmth whilst reacting with water.
- When sodium reacts with water, sodium hydroxide is shaped hydrogen as a byproduct that receives burnt with a shiny flame making the response distinctly exothermic. Adding warm water makes it more vigorous as more heat is released.
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