1.Which one of the following species cannot act as a base? Select one: a. H 2 O
ID: 951072 • Letter: 1
Question
1.Which one of the following species cannot act as a base?
Select one:
a. H2O
b. Cl–
c. NH4+
d. OH–
e. NH3
2.
A gas with an empirical formula NO2 is weighed in a 1 L flask and found to have a mass of 4.0 g. What is its molecular formula? (1 mol of an ideal gas occupies 23.0 L under the conditions of this experiment).
Select one:
a. N2O4
b. N4O8
c. NO
d. NO2
e. N2O
3.
When calcium hydroxide is reacted with excess nitric acid, it produces:
Select one:
a. a solution of Ca2+(aq) and OH–(aq) ions
b. calcium nitrate solution
c. carbon dioxide gas
d. a basic solution
e. hydrogen gas
4.
A dilute aqueous acid was reacted with a white solid to produce a gas. This gas makes limewater turn cloudy and white. Which of the following could be the identity of the white solid?
Select one:
a. NaOH
b. NaHSO3
c. NaCl
d. NaNO3
e. NaHCO3
5.
When magnesium is reacted with hydrochloric acid, it produces:
Select one:
a. a spark
b. a basic solution
c. carbon dioxide gas
d. a solution containing Mg2+ (aq) and Cl– (aq) ions
e. chlorine gas
Explanation / Answer
1 ) answer : c. NH4+
explanation: NH4+ is the acid that cannot act as a base because it came form base NH3
2) answer : a ) N2O4
moles of NO2 = 4 / (14+ 32) = 4 / 46
1 mol gas can occupy ------------------>23 L
4/46 mol gas can occupy ---------------> 23 x 4 / 46 = 2 = n
molecular formula = n x NO2 = 2 x NO2 = N2O4
3) answer : b. calcium nitrate solution
Ca(OH)2 + 2HNO3 ---------------> Ca(NO3)2 + 2H2O
(calcium nitrate)
4) answer :e. NaHCO3
NaHCO3 + HCl ---------------------> NaCl + H2O + CO2
CO2 gas released which turns lime water milky
Ca(OH)2 + CO2 ------------------> CaCO3 (s) + H2O
5) answer: d. a solution containing Mg2+ (aq) and Cl– (aq) ions
Mg + 2HCl --------------------> MgCl2 + H2
MgCl2 -----------------> Mg+2 + 2Cl-
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