1099+ Important Chemistry MCQ Questions Answers

Q:

Isobars are atoms of different chemical elements that have ______.

A) Same atomic number but different mass number	B) Same mass number but different atomic number
C) Same mass number and same atomic number	D) Different mass number and different atomic number

Answer & Explanation Answer: B) Same mass number but different atomic number

Explanation:

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Q:

Elements having same atomic numbers but different mass number are called ______.

A) isotones	B) Isotopes
C) isomopes	D) isobar

Answer & Explanation Answer: B) Isotopes

Explanation:

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Q:

Group 8A of the periodic table contains the

A) least reactive metals	B) most reactive nonmetals
C) most reactive metals	D) least reactive nonmetals

Answer & Explanation Answer: D) least reactive nonmetals

Explanation:

Helium (He), Neon(Ne), Argon(Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) and Ununoctium (Uuo) are present group 8A.

They have fully filled orbitals and hence are most stable amongst all the elements in the periodic table and are considered as least reactive least reactive non-metals.

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Q:

What is formed when helium atom loses one electron?

A) Proton	B) Positive helium ion
C) Negative helium ion	D) Alpha particle

Answer & Explanation Answer: B) Positive helium ion

Explanation:

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Q:

Milk of Magnesia is used as a

A) Laxative	B) Pain killer
C) Sedative	D) Antibiotic

Answer & Explanation Answer: A) Laxative

Explanation:

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Q:

SI unit of equivalent conductance

A) ohm/cm	B) Siemens m2/equivalent
C) Siemens/equivalent	D) mho/cm

Answer & Explanation Answer: B) Siemens m2/equivalent

Explanation:

SI_unit_of_equivalent_conductance1556274980.jpg image

Equivalent conductance is defined as the conductance of an electrolyte solution containing one gram equivalent of the electrolyte. It is equal to the product of specific conductance (k) of the solution and the volume (V) of the solution that contains one gram equivalent of the electrolyte.

$λ$ = k x V

Unit of spceific conductance k is Siemens / m.

Volume of the solution V is $m^{3}$

Now, required equivalent conductance unit is $Siemens . m^{2} / equivalent$ .

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Q:

Which type of reaction occurs when carbon burns in oxygen to give carbo dioxide?

A) Addition reaction	B) Substition reaction
C) Combustion reaction	D) Decomposition reaction

Answer & Explanation Answer: C) Combustion reaction

Explanation:

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Q:

___ is the number of shells for elements of the 3rd period.

A) 1	B) 0
C) 2	D) 3

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