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Chemistry Exam Questions and answers for the
Graduate Level Exam with detailed
explanations
1
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Definition;
BeSO4 (beryllium sulfate) is a white crystalline substance
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Beryllium sulfate can be made by treating an aqueous solution of any
beryllium salt with sulfuric acid, followed by evaporation and
crystallization of the solution
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Because of its high flammable energy,
beryllium sulfate is less soluble in water
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What is the name of the system that employs radiation to determine
the age of prehistoric materials?
(1) Dating with radium
(2) Uranium based dating
(3) The carbon dating method
(4) Deuterium dating
Definition;
Radiocarbon dating (also known as carbon dating) is a radiometric
dating method that employs the naturally occurring radioisotope
carbon-14 ( 14C) to estimate the age of carbon-bearing materials up to
approximately 58,000 to 62,000 years
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Cement is hardened by
(1) dehydration
(2) hydration and water dissociation
(3) water dissociation
(4) polymerisation
Definition;
( Cements (for example, Portland cement) harden owing to hydration,
which happens regardless of the amount of water in the mixture; they
can harden even when submerged or regularly exposed to damp
conditions
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4
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Definition;
Energy is released when a link is broken, and energy must be received
when a bond is formed
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Each
molecule's bond contains a quantity of energy that has been scientifically
calculated and is released into the chemical system when the link is
broken
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When these bonds are broken, energy is
released, resulting in useful energy
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Definition;
Cane-sugar is a carbohydrate made up of carbon, hydrogen, and
oxygen, as the name implies
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Sugar comes in a variety of forms and
is derived from a variety of sources
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Sucrose, a disaccharide, is
the most often used table or granulated sugar in meals
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6
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Definition;
Iron ores are rocks and minerals from which metallic iron can be
economically extracted
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n(H2O)) or siderite (FeCO3 )
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It is mined as the main ore of iron
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Gray hematite is typically
found in places where there has been standing water or mineral hot
springs, such as those in Yellowstone National Park in the United States
7, "All four quantum numbers of two electrons in an atom are different
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(2) Pauli's Exclusion Principle
(3) Hiesenberg's Uncertainty Principle
(4) Avogadro's Law

Definition;
The Pauli exclusion principle states that no two identical fermions
(particles with half-integer spin) can occupy the same quantum state at
the same time
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No two electrons in a single atom, for example, may have the
same four quantum numbers; if n, l, and ml are the same, ms must be
different such that the electrons have opposite spins
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Commercial nitric acid is colored due to the presence of dissolved:
(1) Oxygen,
(2) Nitrous oxide,
(3) Nitrogen dioxide, and
(4) colored impurities
Definition;
Because of the dissolved NO2, commercial nitric acid has a brown color
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9
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Definition;
A growth fertilizer will have a high nitrogen content but a low P and K
content
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It is typically rated 33-0-0 or 34-0-0
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Other growth fertilizer formulations will have 5,
6, or even 7 times more Nitrogen than anything else
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From where do we get the oxygen that keeps us alive?
(1) Carbon dioxide
(2) Carbonates taken from soil
(3) Mineral oxides
(4) Water
Definition;
(4) Because water and carbon dioxide are both oxygen-containing
molecules, oxygen can be obtained
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It is not the case
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The
Water is the source of oxygen
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These electrons finally make their way to the surface
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every time we take a breath
The majority of this oxygen originates from phytoplankton, which are
small ocean plants that reside near the water's surface and travel with
the currents
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Oxygen is a byproduct of
photosynthesis
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The following gasses are employed in the artificial ripening of green
fruit:
(1) Ethylene
(2) Acetylene
(3) Ethane
(4) Methane
Definition;
Ethylene can induce ripening in tomatoes, bananas, citrus, pineapples,
dates, persimmons, pears, apples, melons, mangos, avocados,
papayas, and jujubes, indicating that ethylene's activity is general and
ubiquitous
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12
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(3) Nitrogen, Phosphorus, and Sodium
(4) Calcium, Phosphorus, and Potassium
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materials) added to soil to provide one or more plant nutrients required
for plant growth
The three most important components of conventional fertilizers

are composed of nitrogen Potassium and phosphorus

13
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Cadmium (2) Chrome
(3) Copper (4) Lead
Definition;
The history of car pollution has been one of air and water pollution,
followed by controlled improvement
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Currently, approximately 2
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Every year,
about 1 million tons of lead are utilized in the production of new
batteries
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However, with the phase-out of leaded gasoline, lead emissions have
fallen by around 98 percent
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The largest air concentrations are observed around ferrous and
nonferrous smelters, as well as battery producers
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What is the chemical formula for "baking soda"?
(1) Sodium carbonate;
(2) Sodium bicarbonate;
(3) Sodium nitrite; and
(4) Sodium nitrate
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Sodium bicarbonate is a white
crystalline material that appears as a fine powder in most cases
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Because
salt has been around for a long time and is widely used, it is known by a

variety of names, including baking soda, bread soda, culinary soda, and
bicarbonate of soda
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An atomic pile is used to
(1) generate X-rays
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Which of the following gasses is present in soft drinks under
pressure?
(1) Nitrogen
(2) Oxygen
(3) Carbon Dioxide
(4) Nitrous Oxide
17
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18,The radioactive element utilized in cardiac pacemakers is
(1) Deuterium
(2) Uranium
(3) Plutonium
(4) The element radium
19
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(1) Plutonium
(2) Radium
(3) Deuterium
(4) Uranium
20
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Which of the following is a lubricant used in heavy machinery?
(1) Bauxite
(2) Sulfur
(3) Phosphorus
(4) Graphite
22
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23
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25
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Silk fiber is composed of the following chemical elements:
(1) carbohydrate,
(2) fat,
(3) protein, and
(4) cellulose
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Who invented the Hydrogen Bomb?
Wernher Von Braun
Who developed Hydrogen Bomb?
(1) Wernher Von Braun
(2) J
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When two electrons are in the same orbital, they have the following
properties:
(1) same spin
(2) the polar opposite spin
(3) spin with the same or opposing spin
(4) No spinning

Galvanization is the :
(1) deposition of zinc on iron
(2) deposition of tin on iron

(3) deposition of copper on iron
(4) deposition of aluminum on iron

30
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Which organic component is responsible for the identification of all
oils?
(1) Carbohydrate,
(2) Protein, and
(3) Hydrocarbons
(4) Ester



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