GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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6
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3
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2
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4
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Detailed explanation-1: -Fe2O3 is the chemical formula of Iron(III) oxide which has three oxygen atoms, and two iron atoms.
Detailed explanation-2: -4Fe + 3O2 → 2Fe2O3. This equation indicates that fifteen molecules of oxygen are needed to produce ten molecules of iron(III) oxide.
Detailed explanation-3: -How many Oxygen atoms are in the chemical formula of 2Fe2O3 6 oxygen atoms on the left hand side of the equation; and, equally clearly, there are 6 oxygen atoms on the right hand side of the equation, as indeed there must be in a stoichiometrically balanced equation.
Detailed explanation-4: -3O2 contains six atoms of oxygen. 3O(2) contains six atoms of oxygen. One molecule of calcium oxide contains three atoms. Formula of nitrogen dioxide is NO(2).
Detailed explanation-5: -2O2 represents two molecules of oxygen.