1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following group does NOT follow Newlands Law of Octaves?

A) Li, Na	B) Be, Mg
C) C, Si	D) Mn, Hg

Answer & Explanation Answer: D) Mn, Hg

Explanation:

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Q:

Carbon dioxide is one of the gases that cause the _________.

A) greenhouse effect	B) ozonification
C) oven phenomenon	D) sunburn

Answer & Explanation Answer: A) greenhouse effect

Explanation:

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Q:

Which one of the following is commonly used as an indicator to measure the exact pH?

A) Eosin	B) Phenolphthalein
C) Universal indicator	D) Litmus

Answer & Explanation Answer: C) Universal indicator

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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137 53015

Q:

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

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Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?

A) 1-3-2-4	B) 1-4-2-3
C) 4-2-3-1	D) 2-4-1-3

Answer & Explanation Answer: B) 1-4-2-3

Explanation:

Composition of Dry Air (Substance, % by volume)

Nitrogen, N2 78.08

Oxygen, O2

20.95

Argon, Ar 0.93

Carbon dioxide, CO2 0.033

Neon, Ne 0.0018

Helium, He 0.00052

Methane, CH4 0.0002

Krypton, Kr 0.00011

Dinitrogen oxide, N2O 0.00005

Hydrogen, H2 0.00005

Ozone, O3 0.000001

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Q:

Which one of the following mixture is homogeneous?

A) Water and oil	B) Starch and sugar crystals
C) Graphite and charcoal	D) Alloys

Answer & Explanation Answer: D) Alloys

Explanation:

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Q:

Out of all known elements, the minimum number is of ______.

A) Metals	B) Non-metals
C) Metalloids	D) No option is correct

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