Matter and Its Composition CDS Questions

CDS Chemistry

Matter and Its Composition MCQ Questions


1.
Matter is best defined, in scientific terms, as anything that:
A.
Exists only in the form of energy, with no associated mass
B.
Cannot be perceived by any of the human senses
C.
Has colour but no measurable mass
D.
Has mass and occupies space (volume)
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ANSWER :
D. Has mass and occupies space (volume)
2.
Matter is fundamentally composed of extremely small particles, namely:
A.
Only light waves, with no associated particles
B.
Atoms and molecules
C.
Only colours and odours, with no physical substance
D.
Only electromagnetic fields
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ANSWER :
B. Atoms and molecules
3.
The smallest particle of an element that can take part in a chemical reaction, while still retaining the chemical properties of that element, is called:
A.
An atom
B.
A compound exclusively
C.
A molecule exclusively, with no role for atoms
D.
A mixture
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ANSWER :
A. An atom
4.
A molecule is best defined as:
A.
A mixture of several entirely unrelated, unbonded substances
B.
A single, isolated, electrically charged particle
C.
A group of two or more atoms chemically bonded together, representing the smallest unit of a substance that can exist independently while retaining its chemical properties
D.
A term used exclusively to describe pure metallic elements
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ANSWER :
C. A group of two or more atoms chemically bonded together, representing the smallest unit of a substance that can exist independently while retaining its chemical properties
5.
An element is best defined as a pure substance that:
A.
Exists only in the gaseous state under all conditions
B.
Consists of only one type of atom and cannot be broken down into simpler substances by ordinary chemical methods
C.
Is always a chemical combination of two or more different types of atoms
D.
Can always be readily separated into its constituent parts using simple physical methods, such as filtration
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ANSWER :
B. Consists of only one type of atom and cannot be broken down into simpler substances by ordinary chemical methods
6.
A compound is best defined as a substance formed when:
A.
Two or more different elements chemically combine together in a fixed, definite proportion
B.
Two or more substances are simply mixed together physically, with no actual chemical bonding occurring
C.
Any solid substance is gently heated to a sufficiently high temperature
D.
A single element exists in its pure, unaltered form
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ANSWER :
A. Two or more different elements chemically combine together in a fixed, definite proportion