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Question

Two atoms of X react with two atoms of Y to form ______ molecules of XY.

A
four
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B
eight
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C
two
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D
six
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Solution

The correct option is C two
Writing the word equation in the form of symbols, we get
2X+2Y___XY
For an element, the number of atoms in the reactants should be equal to the number of atoms in the products (Law of conservation of mass)
Here,
Number of atoms of X in reactants = 2
Number of atoms of Y in reactants = 2
Number of atoms of X in products = 1
Number of atoms of Y in products = 1
To balance the number of X and Y atoms, we need to multiply XY by 2.
2X+2Y___XY
Therefore, the number of molecules of XY in the products will be 2.

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