Matter and Its Composition CDS Questions

CDS Chemistry

Matter and Its Composition MCQ Questions


7.
A key distinguishing feature of a compound, as opposed to a simple mixture, is that the constituent elements of a compound:
A.
Cannot be separated from one another by ordinary physical methods, but only through chemical reactions
B.
Are present in entirely variable, non-fixed proportions
C.
Always retain exactly the same individual physical and chemical properties as their constituent elements
D.
Can always be readily separated using simple physical methods, such as filtration or sieving
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ANSWER :
A. Cannot be separated from one another by ordinary physical methods, but only through chemical reactions
8.
A mixture is best defined as a combination of two or more substances that are:
A.
Physically combined, but not chemically bonded together, with each component retaining its own individual properties
B.
Always chemically bonded together in a fixed, definite ratio, forming an entirely new substance
C.
Impossible to ever separate from one another by any known method whatsoever
D.
Always present in exactly equal proportions by mass, with no variation possible
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ANSWER :
A. Physically combined, but not chemically bonded together, with each component retaining its own individual properties
9.
Air is a common, everyday example of which type of mixture?
A.
A pure compound, with a single, fixed chemical formula
B.
A pure element, consisting of only one single type of atom
C.
A homogeneous mixture, since its various gaseous components (nitrogen, oxygen, etc.) are uniformly distributed throughout
D.
A heterogeneous mixture, with clearly and visibly distinct layers or regions
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ANSWER :
C. A homogeneous mixture, since its various gaseous components (nitrogen, oxygen, etc.) are uniformly distributed throughout
10.
Milk is a common, everyday example of which type of mixture?
A.
A homogeneous mixture, with absolutely no visible or distinguishable variation in composition throughout
B.
A heterogeneous mixture (specifically, an emulsion), consisting of fats, proteins, and other components dispersed within water
C.
A pure compound with a single, fixed, definite chemical formula
D.
A pure element
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ANSWER :
B. A heterogeneous mixture (specifically, an emulsion), consisting of fats, proteins, and other components dispersed within water
11.
The three classical, commonly recognised states (or phases) of matter are:
A.
Liquid, gas, and energy
B.
Solid, liquid, and gas
C.
Solid, liquid, and plasma only
D.
Solid, energy, and plasma
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ANSWER :
B. Solid, liquid, and gas
12.
Beyond the three classical states (solid, liquid, gas), modern physics also recognises which additional state of matter, commonly described as an ionised gas?
A.
Aerosol
B.
Crystal
C.
Vapour
D.
Plasma
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ANSWER :
D. Plasma