1099+ Important Chemistry MCQ Questions Answers

Q:

Which group in the modern periodic table contains elements that are inert gases?

A) Group 16	B) Group 18
C) Group 17	D) Group 15

Answer & Explanation Answer: B) Group 18

Explanation:

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Q:

Which among the following statements are TRUE regarding synthetic fibre?

I. They melt after catching fire.

II. They are more durable.

III. They are prepared by a number of processes using petrochemicals.

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:

The process of transferring of charge from a charged object to the earth is called ______________.

A) neutralisation	B) negation
C) terraforming	D) earthing

Answer & Explanation Answer: D) earthing

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 of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

Answer & Explanation Answer: B) A and B

Explanation:

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Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

A) Metal ion at second position	B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position	D) No option is correct

Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

Explanation:

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Q:

The electronic dot and cross structure of ethene is ............

A)	B)
C)	D)

Answer & Explanation Answer: C)

Explanation:

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Q:

Which of the following statement(s) about acids is/are CORRECT ?

I. They change the color of red litmus to blue.
II. They change the color of blue litmus to red.
III. They have pH value less than 7.

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

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