The Oxidation State Of Carbon in Formaldehyde

The Oxidation State Of Carbon in Formaldehyde
The Oxidation State Of Carbon in Formaldehyde
11. The mass percent of oxygen in sucrose, C12H22O11, is approximately
(A) 50%
(B) 25%
(C) 10%
(D) 75%
12. The density of water is 1 g/mL. What is the molarity of water in pure
water?
(A) 55 M
(B) 5.5 M
(C) 18 M
(D) 1 M
13. What is the oxidation state of carbon in formaldehyde (HCHO)?
(A) 0
(B) 4
(C) −4
(D) 2
14. What is the oxidation state of iodine in the periodate ion (IO4−)?
(A) 0
(B) 8
(C) −1
(D) 7
4 ❯ McGraw-Hill’s 500 MCAT General Chemistry Questions
15. The following reaction illustrates the ability of hydrogen to serve as
a reducing agent:
Re2O7(s) 7 H2(g ) → 2 Re(s) 7 H2O(g )
A 1.0 kg sample of Re2O7(s) is reacted with 1.0 kg of H2. What is the
maximum amount of Re formed?
(A) 0.77 kg
(B) 2.0 kg
(C) 0.50 kg
(D) 0.25 kg
16. The solution formed by mixing 100 mL of 3 M H2SO4 with 200 mL
of 3 M KOH is identical to 300 mL of
(A) 2 M K2SO4
(B) 3 M K2SO4
(C) 1 M K2SO4
(D) 1 M H2SO4 plus 2 M KOH
17. Dichlorine heptoxide, Cl2O7, is an unstable compound. Which of the
following substances contains chlorine in the same oxidation state as
the chlorine in dichlorine heptoxide?
(A) HCl
(B) HClO4
(C) HClO3
(D) Cl2
18. What is the oxidation state of iron in Fe3O4?
(A) 8/3
(B) 3
(C) 2
(D) 0
The Oxidation State Of Carbon in Formaldehyde
19. Glucose, or blood sugar, is a carbohydrate. The molecular formula
for glucose is C6H12O6. What is the empirical formula of glucose?
(A) CHO
(B) C6H12O6
(C) CH2O
(D) C3H4O2
The Basics ❮ 5
20. How many milliliters of 0.20 M Ba(OH)2 solution are necessary
to neutralize 0.0500 L of 0.20 M HCl solution?
(A) 75 mL
(B) 50 mL
(C) 12 mL
(D) 25 mL
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