X and Y are oxides of elements of Period 3 of the Periodic Table. If one mole of X is added into water, the solution produced is neutralised by one mole of Y. Which oxides are represented by X and Y?
X | Y
---|---
A | SO3 | Al2O3
B | P4O10 | Na2O
C | SO3 | Na2O
D | P4O10 | Al2O3
Answer (1)
The question refers to the neutralization between oxides of Period 3 elements when they react with water.
Understanding Neutralization : Neutralization is a chemical reaction where an acid and a base react to form water and a salt. In this context, X and Y are oxides which, when dissolved in water, form either acidic or basic solutions.
Analyzing Oxides in Period 3 :
SO₃ (Sulfur trioxide) : This is an acidic oxide, which when added to water forms sulfuric acid (H₂SO₄).
P₄O₁₀ (Diphosphorus pentoxide) : This is another acidic oxide that forms phosphoric acid (H₃PO₄) in water.
Na₂O (Sodium oxide) : This is a basic oxide, forming sodium hydroxide (NaOH) in water.
Al₂O₃ (Aluminum oxide) : While it can react with both acids and bases, in this context it is assumed to be amphoteric, not forming a clear solution like the others.
Matching Oxides to Neutralization Reaction : In a neutralization reaction, an acidic solution will react with an equal amount of a basic solution.
SO₃ and Na₂O : SO₃ forms an acidic solution with water, and Na₂O forms a basic solution with water. Together, they neutralize each other.
Based on this analysis, the correct answer is:
C. SO₃ | Na₂O
This is because SO₃ is the acidic oxide that reacts with water to form an acid, and Na₂O is the base that can neutralize it when formed into a solution.
