circle the letter of the correct choice.
Which of the following substances is an acid?
milk.
bleach.
ammonia.
seawater.
A very strong base has a pH close to
1
5
7
14
Properties of acids include
a bitter taste.
a slippery feel.
the ability to conduct electricity.
two of the above
Which of the following ionic compounds forms an acid when dissolved in water?
KCl
HCl
NaCl
MgCl2
Bases are used to make all of the following products except
soap.
concrete.
deodorant.
car batteries.
If a solution has a greater concentration of hydrogen ions than does pure water, then the solution
has a pH greater than 7.
is a base.
is an acid.
two of the above
Which of the following chemical equations represents a neutralization reaction?
NaOH + H2O → OH- + Na+
Na+ + Cl- → NaCl
HCl + NaOH → NaCl + H2O
Mg + 2HCl → H2 + MgCl2
Answers
Q(1) Which of the following substances is acid?
(a) milk
(b) bleach
(c) ammonia
(d) seawater
Answer - (a) milk
Reason - Milk contains lactic acid which makes its pH 6.7 to 6.9, which is a very mild acid.
Q(2) A very strong base has a pH close to
(a) 1
(b) 5
(c) 7
(d) 14
Answer - (d) 14
Reason - 14 is the highest number on the pH scale. Compounds having a pH of 14 or close to 14 are classified as very strong bases.
Q(3) Properties of acids include
(a) bitter taste.
(b) slippery feel.
(c) the ability to conduct electricity.
(d) two of the above
Answer - (c) the ability to conduct electricity
Reason - Acids can conduct electricity while they don't have a bitter taste nor do they have a slippery feel.
Q(4) Which of the following ionic compounds forms an acid when dissolved in water?
(a) KCl
(b) HCl
(c) NaCl
(d) MgCl2
Answer - HCl
Reason - At first HCl is a gas. When it reacts with water it creates hydrochloric acid.
Q(5) Bases are used to make all of the following products except
(a) soap
(b) concrete
(c) deodorant
(d) car batteries
Answer - (d) car batteries
Reason - Car batteries are made of acids, not bases.
Q(6) If a solution has a greater concentration of hydrogen ions than does pure water, then the solution
(a) has a pH greater than 7.
(b) is a base.
(c) is an acid.
(d) two of the above
Answer - (c) is an acid
Reason - Acids have more hydrogen ions than pure water.
Q(7) Which of the following chemical equations represents a neutralization reaction?
(a) NaOH + H2O → OH- + Na+
(b) Na+ + Cl- → NaCl
(c) HCl + NaOH → NaCl + H2O
(d)Mg + 2HCl → H2 + MgCl2
Answer - (c) HCl + NaOH → NaCl + H2O
Reason - In a neutralization reaction, salt and water are always formed. In the above equation, option (c) is the only reaction which have water and salt as products of the reaction
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