Chemical Equations and Stoichiometry NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Chemical Equations and Stoichiometry MCQ Questions


7.
In balancing chemical equations, we should:
A.
Change coefficients only
B.
Change subscripts of formulas
C.
Remove some species
D.
Add new species
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ANSWER :
A. Change coefficients only
8.
In the unbalanced equation P₄ + O₂ → P₄O₁₀, what is the coefficient of O₂ in the balanced equation?
A.
1
B.
3
C.
10
D.
5
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ANSWER :
D. 5
9.
In the equation Fe + O₂ → Fe₂O₃, after balancing, the coefficient of Fe is:
A.
3
B.
2
C.
6
D.
4
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ANSWER :
D. 4
10.
In the balanced equation 2H₂(g) + O₂(g) → 2H₂O(g), the coefficient '2' before H₂ represents:
A.
2 moles (or 2 molecules) of H₂
B.
2 atoms of hydrogen
C.
2 ions of hydrogen
D.
2 grams of hydrogen
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ANSWER :
A. 2 moles (or 2 molecules) of H₂
11.
In CH₄ + 2O₂ → CO₂ + 2H₂O, the stoichiometric coefficient of O₂ is:
A.
2
B.
3
C.
4
D.
1
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ANSWER :
A. 2
12.
In a balanced chemical equation, the coefficients give the ratio of:
A.
Masses of reactants and products
B.
Volumes of all reactants and products
C.
Moles (or molecules) of reactants and products
D.
Atoms of reactants and products
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ANSWER :
C. Moles (or molecules) of reactants and products