Objective Questions

Questions (1872)

#	Question	Topic	Actions
101	In Rutherford's gold foil experiment, what was the fate of the majority of the …	CHM 101 Past Questions	View
102	Who proposed that atoms of the same element are identical in size, mass, and ch…	CHM 101 Past Questions	View
103	Two moles of a compound X were heated in a closed vessel. It decomposes accordi…	CHM 101 Past Questions	View
104	A 20.00 mL sample of a KOH solution is titrated with 15.00 mL of 0.100 M H₂SO₄ …	CHM 101 Past Questions	View
105	The process by which a gas is converted directly to a solid is called:	CHM 101 Past Questions	View
106	A hypothesis in science must be:	CHM 101 Past Questions	View
107	Mixing which of the following pairs of solutions will result in the formation o…	CHM 101 Past Questions	View
108	What type of bond is formed when electrons are shared unequally between two ato…	CHM 101 Past Questions	View
109	The idea that matter is composed of indivisible particles was rejected by which…	CHM 101 Past Questions	View
110	The average atomic mass of lithium is 6.94 amu. It has two isotopes: ⁶Li (6.015…	CHM 101 Past Questions	View
111	In the Down's process for the industrial production of sodium, what is the prim…	CHM 101 Past Questions	View
112	In a galvanic cell, which electrode is the site of oxidation and has a negative…	CHM 101 Past Questions	View
113	What was the key difference between the atomic theories of Democritus and John …	CHM 101 Past Questions	View
114	The correct cell notation for a standard copper-silver voltaic cell is:	CHM 101 Past Questions	View
115	Which of the following hydrocarbons would be most soluble in water?	CHM 101 Past Questions	View
116	Which of the following is a characteristic of an electrolytic cell?	CHM 101 Past Questions	View
117	How many moles are present in 3.01 × 10²³ molecules of water?	CHM 101 Past Questions	View
118	For the reaction 2A + B → C, the rate law is rate = k[A]²[B]. If the concentrat…	CHM 101 Past Questions	View
119	The industrial production of sodium metal is achieved by the electrolysis of:	CHM 101 Past Questions	View
120	For the combustion reaction of methane: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) with…	CHM 101 Past Questions	View
121	For the reaction: 2A + B ⇌ 3C, K = 2.0. What is the value of K for the reaction…	CHM 101 Past Questions	View
122	Which of the following is an example of a reduction reaction?	CHM 101 Past Questions	View
123	A compound used in antifreeze has a molecular mass of 62.0 g/mol and a mass per…	CHM 101 Past Questions	View
124	Who proposed that atoms of the same element are identical in mass?	CHM 101 Past Questions	View
125	Given the standard enthalpies of formation: ΔHf°[NH₃(g)] = -46 kJ/mol, ΔHf°[HCl…	CHM 101 Past Questions	View
126	For which reaction does the equilibrium constant K have units of (concentration…	CHM 101 Past Questions	View
127	The scientific method involves all of the following steps EXCEPT:	CHM 101 Past Questions	View
128	Gases are easily compressible because:	CHM 101 Past Questions	View
129	What type of error occurs due to the limitations of measuring instruments or hu…	CHM 101 Past Questions	View
130	For the reaction: 2A + B ⇌ 3C, K = 0.5. What is the value of K for the reaction…	CHM 101 Past Questions	View
131	The absolute error in a measurement is defined as:	CHM 101 Past Questions	View
132	A student measures a sample's weight as 18.3g, but the true weight is 20.0g. Wh…	CHM 101 Past Questions	View
133	Accuracy in scientific measurements refers to:	CHM 101 Past Questions	View
134	Which student is most accurate if the true value is 2.000 g? Student A: 1.964 g…	CHM 101 Past Questions	View
135	Precision refers to:	CHM 101 Past Questions	View
136	If a student’s measurements are precise but not accurate, it means:	CHM 101 Past Questions	View
137	What type of error results when a person misreads an instrument due to parallax?	CHM 101 Past Questions	View
138	Which of the following is both accurate and precise?	CHM 101 Past Questions	View
139	Stoichiometry is best defined as:	CHM 101 Past Questions	View
140	The standard for measuring relative atomic mass is:	CHM 101 Past Questions	View
141	Why is the atomic mass of carbon 12.01 instead of 12.00?	CHM 101 Past Questions	View
142	Which of the following instruments is used to determine atomic masses?	CHM 101 Past Questions	View
143	For the reaction X + Y → Z, the rate law is rate = k[X]²[Y]. If [X] is doubled …	CHM 101 Past Questions	View
144	The average atomic mass takes into account:	CHM 101 Past Questions	View
145	The formula for calculating molar mass includes:	CHM 101 Past Questions	View
146	Which element has the highest percentage composition in KMnO₄?	CHM 101 Past Questions	View
147	If a compound has a molar mass of 100 g/mol and contains 25 g of element A, wha…	CHM 101 Past Questions	View
148	The formula for percentage composition is:	CHM 101 Past Questions	View
149	Which of the following has a molar mass closest to 97.99 g/mol?	CHM 101 Past Questions	View
150	The molar mass of ethanol (C₂H₅OH) is approximately:	CHM 101 Past Questions	View
151	Which of the following elements has the highest first ionization energy?	CHM 101 Past Questions	View
152	Electronegativity increases across a period because:	CHM 101 Past Questions	View
153	Which element is expected to have the lowest electronegativity?	CHM 101 Past Questions	View
154	Why do elements in the same group of the periodic table exhibit similar chemica…	CHM 101 Past Questions	View
155	What happens to the ionization energy as atomic radius increases?	CHM 101 Past Questions	View
156	Which of the following elements is least likely to form a cation?	CHM 101 Past Questions	View
157	Why does atomic radius increase down a group?	CHM 101 Past Questions	View
158	What explains the higher ionization energy of nitrogen compared to oxygen?	CHM 101 Past Questions	View
159	Which set shows correct trend of increasing electronegativity?	CHM 101 Past Questions	View
160	Which element in Period 3 has the lowest ionization energy?	CHM 101 Past Questions	View
161	Which orbital configuration leads to a relatively higher ionization energy?	CHM 101 Past Questions	View
162	What kind of bonding results from similar electronegativities between atoms?	CHM 101 Past Questions	View
163	The shielding effect has what kind of influence on ionization energy?	CHM 101 Past Questions	View
164	What determines the position of an element in the periodic table?	CHM 101 Past Questions	View
165	What trend is observed in electronegativity across a period?	CHM 101 Past Questions	View
166	Which element would have the highest second ionization energy?	CHM 101 Past Questions	View
167	Which property generally decreases across a period?	CHM 101 Past Questions	View
168	Why is fluorine the most electronegative element?	CHM 101 Past Questions	View
169	The f-block elements are usually:	CHM 101 Past Questions	View
170	Which statement best explains why O₂ is not considered a compound?	CHM 101 Past Questions	View
171	Which scientist first proposed the idea that atoms are indivisible and cannot b…	CHM 101 Past Questions	View
172	What discovery led to the rejection of Dalton’s solid sphere model of the atom?	CHM 101 Past Questions	View
173	Which of the following statements correctly describes a cation and an anion?	CHM 101 Past Questions	View
174	What was the major conclusion from Rutherford’s gold foil experiment?	CHM 101 Past Questions	View
175	Which scientist’s model of the atom resembled “plums in pudding”?	CHM 101 Past Questions	View
176	Which of the following best describes Bohr’s model of the atom?	CHM 101 Past Questions	View
177	Which of the following best differentiates isotopes from one another?	CHM 101 Past Questions	View
178	What observation in the gold foil experiment indicated the existence of a dense…	CHM 101 Past Questions	View
179	Which of these best defines relative atomic mass?	CHM 101 Past Questions	View
180	How is absolute error calculated?	Errors and Stoichiometry	View
181	The kinetic energy of a 7.3 kg steel ball traveling at 18.0 m/s is _____ J.	CHM 101 Past Questions	View
182	The mass number of an atom is the sum of:	CHM 101 Past Questions	View
183	Which pair represents isotopes of the same element?	CHM 101 Past Questions	View
184	Which expression represents the solubility product of Silver sulphate, Ag₂SO₄?	CHM 101 Past Questions	View
185	A sample of 1 mol of N₂O₄ was placed in an empty 1 dm³ container and allowed to…	CHM 101 Past Questions	View
186	A nitrogen-hydrogen mixture, initially in the mole ratio of 1:3 reached equilib…	CHM 101 Past Questions	View
187	When 0.20 mol of hydrogen gas and 0.15 mol of iodine gas are heated at 450 °C u…	CHM 101 Past Questions	View
188	Stomach juices have a pH of 1.0. Aspirin is a monobasic acid represented by HA …	CHM 101 Past Questions	View
189	Sulphuric acid vapour dissociates when heated according to the equation H₂SO₄(g…	CHM 101 Past Questions	View
190	A solution of ethanoic acid of concentration 0.01 mol dm⁻³ has a pH of 3.38. Ca…	CHM 101 Past Questions	View
191	Calculate the pH of 0.002 mol dm⁻³ solution of calcium hydroxide	CHM 101 Past Questions	View
192	Calculate the solubility product of 0.001 mol dm⁻³ solution of Ag₂S at 25 °C	CHM 101 Past Questions	View
193	A system that exchanges both matter and energy with its surroundings is referre…	CHM 101 Past Questions	View
194	The energy that causes a system to move a certain distance is	CHM 101 Past Questions	View
195	What is the work done in joules by a system of gas that expands at a constant p…	CHM 101 Past Questions	View
196	In the reaction between methane (CH₄) and oxygen O₂, 891 kJ of heat was given o…	CHM 101 Past Questions	View
197	What is the change in internal energy, ΔU, of a system that releases 20.4 kJ of…	CHM 101 Past Questions	View
198	Given ΔH₁ = ? N₂O₄ → 2NO₂, ΔH₂ = 2 kcal, 2NO₂ → N₂ + 2O₂, ΔH₃ = -27 kcal, N₂ + …	CHM 101 Past Questions	View
199	For the reaction: H₂(g) + Br₂(g) → 2HBr(g), 72 kJ of heat was given off. How mu…	CHM 101 Past Questions	View
200	Given the standard enthalpy of formation for the following in kJ/mol: ΔHf°(CaCO…	CHM 101 Past Questions	View

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