10 easy Chem 101 questions. The best answer wins the points. 1) What is the oxid

Question

10 easy Chem 101 questions. The best answer wins the points.

1) What is the oxidation state of Cr in K2Cr2O7?

A) +3

B) +6

C) +4

D) +2

2) Which of the following unbalanced reactions is a single replacement reaction?

A) CaCl2 + H2O ? CaCl2 ? 2H2O

B) KClO3 ? KCl + O2

C) Mg + HCl ? H2 + MgCl2

D) HCl + NaOH ? NaCl + H2O

3) Classify the following reaction: P4 + 5O2 + 6H2O ? 4H3PO4.

A) combustion

B) decomposition

C) combination

D) single replacement

4) Classify the reaction 2I4O9 ? 2I2O6 + 2I2 + 3O2.

A) decomposition

B) combination

C) combustion

D) single replacement

5) Which equation has 1: 2: 1: 2 as the relative ratio of coefficients when balanced?

A) NaOH + HCl ? NaCl + H2O

B) H2SO4 + KOH ? K2SO4 + H2O

C) Zn + HCl ? H2 + ZnCl2

D) C2H4 + O2 ? CO2 + H2O

6) In the reaction Fe2O3 + 3CO ? 2Fe + 3CO2, which atom(s) has a more negative oxidation state on the product side than the reactant side?

A) iron

B) oxygen

C) carbon and oxygen

D) carbon

7) HC2H3O2 is the correct formula for __________.

A) phosphoric acid

B) carbonic acid

C) nitric acid

D) acetic acid

8) Which equation has 1: 2: 1: 2 as the relative ratio of coefficients when balanced?

A) K3PO4 + AgNO3 ? Ag3PO4 + KNO3

B) C4H6 + O2 ? CO2 + H2O

C) Al + H2SO4 ? H2 + Al2(SO4)3

D) Ba(OH)2 + HCl ? BaCl2 + H2O

9) The number of moles of calcium hydroxide needed to neutralize one mole of sulfuric acid is __________.

A) 3

B) 0.5

C) 1

D) 2

10) After balancing the equation KClO3 ? O2 + KCl the correct coefficients are respectively __________.

A) 3: 3: 3

B) 2: 3: 2

C) 1: 3: 1

D) 3: 2: 3

Explanation / Answer

1. B

2. C

3. A

4. A

5. B

6. A

7. D

8. D

9. C

10. B

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