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(A) HPO
4
–3 
and H
2
O
(B) H
2
O and PO
4
–3
(C) H
3
O+and H
2
O
(D) HPO
4
–2
and PO
4
–3
(E) H
3
O
+
and PO
4
–3
61. 10ml of 1M H
2
SO
4
is added dropwise to 100ml
of .1M KOH. What is the approximate pH of
the solution?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
62. Given: CaO + CO
2
= CaCO
3
+ 40kcal/mole If
176g of CO
2
are consumed, then how many
kcal of heat are released?
(A) 80kcal
(B) 100kcal
(C) 120kcal
(D) 140kcal
(E) 160kcal
63. The pKa of acid X is 5. The pH of a solution
containing acid X and its conjugate base is 6.
What is the ratio of the concentration of con-
jugate base to the concentration of acid? (conj.
base : acid)
(A) 1:1
(B) 2:1
(C) 5:1
(D) 10:1
(E) 20:1
64. When C
2
H
6
burns completely in oxygen,
which of the following are products?
I.
H
2
O
II.
CO
2
III. Heat
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
65. Given the hypothetical reaction 2A + B = C +
3D, the equilibrium constant for this reaction is
I.
directly proportional to the concentration
of D cubed
II.
inversely proportional to the concentration
of A
III. inversely proportional to the concentration
of C
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only

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Chemistry Subject Test
295
ARCO
■ SAT II Subject Tests
w w w . p e t e r s o n s . c o m / a r c o
66. Which of the following factors will initially
increase the forward rate of the following exo-
thermic reaction:
I.
Increasing the temperature
II.
Increasing the concentration of X
III. Adding a catalyst
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
67. A cation with +2 charge of atomic number 56
and atomic mass 137 contains
I.
54 protons
II.
81 neutrons
III. 54 electrons
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
68. Two moles of electrons can do which of the
following:
I.
Reduce one mole of Ag
+
to Ag
II.
Reduce one mole of Cu
+2
to Cu
III. Reduce 
2
3
mole of Al
+3
to Al
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
69. The ionization energy of Argon (Ar) is
greater than
I.
Chlorine (Cl)
II.
Phosphorous (P)
III. Neon (Ne)
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
70. Selenium (Se) may be distinguished from
Bromine (Br) by
I.
determining the boiling point of each
element
II.
determining which element reacts with
H under the appropriate conditions
III. determining which element reacts with
oxygen under the appropriate conditions
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
71. A flask contains oxygen, nitrogen, and helium.
There are 5 moles of nitrogen, 4 moles of he-
lium, and 1 mole of oxygen. If the total pres-
sure in the flask is 10,000 torr, then
I.
the partial pressure of helium is 5000 torr
II.
the partial pressure of nitrogen is 5000 torr
III. the partial pressure of oxygen is 1000 torr
(A) I, II, and III
(B) I and II only
(C) II and III only
(D) I only
(E) III only
STOP
IF YOU FINISH BEFORE TIME IS CALLED,
YOU MAY CHECK YOUR WORK ON THIS
TEST ONLY. DO NOT WORK ON ANY
OTHER TEST IN THIS BOOK.

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Lesson 10
296
w w w . p e t e r s o n s . c o m / a r c o
ARCO
■ SAT II Subject Tests
EXPLANATORY ANSWERS
Part A
1. The correct answer is (B). A manometer measures the pressure of a gas or a liquid.
2. The correct answer is (E). A galvanometer measures small electric currents.
3. The correct answer is (A). A pipette accurately measures a specific volume of liquid.
4. The correct answer is (D). A calorimeter is used to measure the heat produced by a process.
5. The correct answer is (D). Methane (CH
4
) has four equivalent C = O bonds distributed equally in space.