1099+ Important Chemistry MCQ Questions Answers

Q:

Isotopes of an element have ______.

A) Same physical properties	B) Different chemical properties
C) Different number of neutrons	D) Different atomic number

Answer & Explanation Answer: C) Different number of neutrons

Explanation:

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Q:

Charge on proton is equal to the charge on ______.

A) Electron	B) Positron
C) Neutron	D) Alpha particle

Answer & Explanation Answer: B) Positron

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Q:

Which of the following causes acid rain?

I. SO2

II. NO2

III. CO2

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

Answer & Explanation Answer: A) Only I and II

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Q:

The mass of one molecule of oxygen is

A) 2.3 x 10-23 g	B) 3.3 x 10-23 g
C) 4.3 x 10-23 g	D) 5.3 x 10-23 g

Answer & Explanation Answer: D) 5.3 x 10-23 g

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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:

How many molecules are present in one mole of water?

A) 6.02 x 1023 molecules	B) 6.02 x 1026 molecules
C) 8.02 x 1022 molecules	D) 7.02 x 1023 molecules

Answer & Explanation Answer: A) 6.02 x 1023 molecules

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Q:

Which of the following solutions is alkaline?

A) H+ <1 × 10-7 Mol/l	B) H+ = 1 × 10-4 Mol/l
C) H+ = 1 × 10-7 Mol/l	D) H+ > 1 × 10-7 Mol/l

Answer & Explanation Answer: A) H+ <1 × 10-7 Mol/l

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Q:

Which category of Hydrogen releases water vapour and a by product when burnt?

A) Green Hydrogen	B) Blue Hydrogen
C) Red Hydrogen	D) Black Hydrogen

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