General Chemical Reactions

    1) In a balanced chemical equation,

(a) moles are conserved

(b) mass is conserved

(c) molecules are conserved

(d) atoms are conserved

 

    2) In which of the following does sulfur have the highest oxidation number?

(a) SF₆

(b) SO₃^2-

(c) H₂S

(d) S

 

    3) Which of the following is a not a redox reaction?

(a) Mg(s) + Br₂(l) MgBr₂(s)

(b) 2SO₂(g) + O₂(g) 2SO₃(g)

(c) 2NaCl(aq) + 2H₂SO₄(aq) HCl(aq) + Na₂SO₄(aq)

(d) 2Na(s) + Cl₂(g) 2NaCl(l)

 

    4) In a balanced chemical equation, the

(a) number of molecules of product equals the number of molecules of reactant

(b) number of moles of products equals the number of moles of reactants

(c) mass of the molecules in the products equals the mass of the molecules in the reactants

(d) concentration of reactants equals the concentration of products

 

    5) In which of the following does nitrogen have the highest oxidation number?

(a) N₂

(b) HNO₃

(c) NO₂^-

(d) N₂H₄

 

    6) Which of the following is a not a redox reaction?

(a) PbS(s) + 2H⁺(aq) H₂S(g) + Pb²⁺(aq)

(b) 2H₂O₂(l) 2H₂O(l) + O₂(g)

(c) 2N₂O₅(g) 2NO₂(g) + O₂(g)

(d) C₂O₄^2-(aq) + Fe³⁺(aq) 2CO₂(g) + Fe²⁺(aq)

 

    7) Balanced chemical equations show

(a) the concentration of reactants and products

(b) whether a chemical reaction will occur

(c) the relative number of reactant molecules which can take part in a chemical reaction

(d) that molecules are conserved

 

    8) In which of the following does cobalt have the highest oxidation number?

(a) Co

(b) Co(NO₃)₂

(c) CoCl₂

(d) Co³⁺

    9) Which of the following is a not a redox reaction?

(a) 6H⁺(aq) + 5I^-(aq) + IO₃^-(aq) 3I₂(aq) + 3H₂O(l)

(b) Fe₂O₃(s) + 3H₂(g) 2Fe(s) + 3H₂O(g)

(c) Cl₂(g) + H₂O(l) ClO^-(aq) + Cl^-(aq) + 2H⁺(aq)

(d) 2NH₄⁺(aq) + CaO(s) Ca²⁺(aq) + 2NH₃(g) + H₂O(l)

   10) In which of the following does manganese have the highest oxidation number?

(a) Mn

(b) Mn(NO₃)₂

(c) MnO₄^-

(d) Mn²⁺

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