The Officials Chm101 CBT Practice
- 1.Molarity is defined as ______
- A.
Moles of solute per liter of solution
- B.
Moles of solute per litre of solvent
- C.
Moles of solvent per liter of solution
- D.
Moles solvent per liter of solvent
- 2.The Element that best describes Alpha decay is?
- A.
Helium
- B.
Sodium
- C.
Calcium
- D.
Methane
- 3.What is the name of the CEO of The Officials Educational consult?
- A.
Femi Ajewole
- B.
Williams David
- C.
King Adewole David
- D.
Oyewole Kolawole David
- 4.What is the Mass number of Na?
- 5.What is the oxidation number of the chromium atom in K2Cr2O7
- A.
-2
- B.
+3
- C.
+6
- D.
+7
- 6.How many grams of KNO3 are needed to make 250ML of a solution that is 0.135M
- A.
1.71g
- B.
0.341g
- C.
3.41g
- D.
6.82g
- 7.Of the following, which element has the highest first ionization energy
- A.
Iodine
- B.
Bromine
- C.
Fluorine
- D.
Chlorine
- 8.Isotopes have the same number of __________ but different numbers of ___________ in their nuclei
- A.
Electron, neutron
- B.
Protons, neutrons
- C.
Protons, electrons
- D.
Nucleon, neutron
- 9.Which of the following is not an Arrhenius acid?
- A.
HF
- B.
KOH
- C.
HCLO
- D.
H2SO3
- 10.Which of the following can be classified as a weak base?
- A.
CH3NH2
- B.
NH2OH
- C.
Both CH3NH2 and NH2OH
- D.
Neither A nor B
- 11.Which of the following can be interpreted as a measure of randomness
- A.
Enthalpy
- B.
Entropy
- C.
Free Energy
- D.
Temperature
- 12.The energy of motion is
- A.
Electrical Energy
- B.
Dam energy
- C.
Reserve energy
- D.
Kinetic Energy
- 13.What is the minimum energy barrier that must be overcome for a chemical reaction to occur
- A.
Activation Energy
- B.
Net energy
- C.
Potential energy
- D.
Rate limiting energy
- 14.What is the overall reaction order for the reaction that has the rate law: k[H2] [NO] 2
- A.
Zero order
- B.
First order
- C.
Second order
- D.
Third order
- 15.A catalyst increases the rate of reaction by providing a different reaction pathway that
- A.
Lowers only the activation Energy
- B.
Raises only the energy of the products
- C.
Lowers only the energy of the reactants and products
- D.
All of these are affected by the presence of a catalyst
- 16.The number of nucleons in an atom or ion is the same as the
- A.
Atomic Number
- B.
Charge on the atom or ion
- C.
Mass Number
- D.
None of these
- 17.The binding energy is defined as
- A.
The amount of energy absorbed when electrons are added to an ion.
- B.
The amount of energy absorbed when protons and neutrons form a nucleus
- C.
The amount of energy released when electrons are removed from the atom
- D.
The amount of energy required to break apart a nucleus into individual protons and neutrons
- 18.Elements with ___________ atomic mass are best possible candidates for a fusion reaction
- A.
Very low
- B.
Moderate
- C.
Moderate to heavy
- D.
Very heavy
- 19.Radiation is detected by its ___________ properties
- A.
Gravitational
- B.
Ionizing
- C.
Kinetic
- D.
Thermal
- 20.What is the field of the CEO of The Officials Educational consult?
- A.
Mass Communication
- B.
Computer Engineering
- C.
Mechatronics Engineering
- D.
Pure Chemistry
- 21.The effect of ionizing radiation depend on
- A.
Length of exposure to radiation
- B.
Location of source (internal or external)
- C.
Type and energy of radiation
- D.
All of the above
- 22.Who is the Dean of Faculty of Science in Fuoye
- A.
Dr. Lawal
- B.
Dr. Malomo
- C.
Dr. Okolo
- D.
Dr. Shakirudeen
- 23.What is the mole fraction of ethanol in a solution made by dissolving 25g of ethanol, C2H5OH, in 53.6g of Water?
- A.
0.154
- B.
0.846
- C.
0.214
- D.
0.272
- 24.What is the expected freezing point of a 0.50m solution of Na2CO3 in water? Kf for water is 1.86°C/m
- A.
-0.93°C
- B.
-1.9°C
- C.
-2.8°C
- D.
-6.5°C
- 25.Which cell involves a non-spontaneous redox reaction?
- A.
Concentration cell
- B.
Electrolytic Cell
- C.
Fuel Cell
- D.
Galvanic cell
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