Chemistry - Section 1

Directions to Solve

Chemistry - Section 1

1.

The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

A.	atomic structure
B.	metallurgy
C.	periodic table of contents
D.	discovery of elements

Answer: Option C

Explanation:

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2.

The molecular formula of phosphorous is

A.	P1
B.	P2
C.	P3
D.	P4

Answer: Option D

Explanation:

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3.

The inert gases are ____ in water

A.	sparingly soluble
B.	insoluble
C.	soluble
D.	None of these

Answer: Option A

Explanation:

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4.

The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

A.	liquation
B.	leaching
C.	levigation
D.	magnetic separation

Answer: Option C

Explanation:

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5.

The metal that is usually extracted from sea water is

A.	Ca
B.	Na
C.	K
D.	Mg

Answer: Option D

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6.

The formula C₆H₅-CO-CH₃ represents

A.	Acetone
B.	Acetic acid
C.	Acetophenone
D.	Phenyl acetate

Answer: Option C

Explanation:

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7.

The maximum number of covalent formed by nitrogen is

A.	1
B.	2
C.	3
D.	4

Answer: Option D

Explanation:

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8.

The mass number of an atom is equal to

A.	the number of protons
B.	the number of protons and electrons
C.	the number of nucleons
D.	the number of neutrons

Answer: Option C

Explanation:

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