1099+ Important Chemistry MCQ Questions Answers

Q:

........... as is used as an illuminating gas.

A) Methyl	B) Propane
C) Butene	D) Ethyne

Answer & Explanation Answer: B) Propane

Explanation:

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Q:

What is the general formula for a straight-chain alkane?

A) C2nH2n+3.	B) CnH2n+2
C) CnH2n	D) CnH3n+2.

Answer & Explanation Answer: B) CnH2n+2

Explanation:

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Q:

Isotopes are atoms of the same element that have different

A) mass numbers	B) atomic numbers
C) protons	D) All of the above

Answer & Explanation Answer: A) mass numbers

Explanation:

Isotopes are atoms of the same element that have different mass numbers.

Example : Hydrogen, Deutirium and tritium all these have different mass but same atomic numbers.

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Q:

The (O-H) bond in ${CH}_{3} OH$ is _____.

A) polar covalent	B) ionic
C) non polar covalent	D) cationic

Answer & Explanation Answer: A) polar covalent

Explanation:

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Q:

Which molecule is nonpolar and has a symmetrical shape?

A) NH3	B) HCl
C) H2O	D) CH4

Answer & Explanation Answer: D) CH4

Explanation:

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

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Q:

Group 7A of the periodic table contains the

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

Answer & Explanation Answer: C) most reactive non metals

Explanation:

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Q:

which of the following molecule contains a nonpolar covalent bond?

A) Br2	B) CO2
C) CCl4	D) CO

Answer & Explanation Answer: A) Br2

Explanation:

Br-Br.

In Br2, two of the same atoms, pull on each side of the bond is equal making it as non-polar.

The other options all include a significantly more electronegative atom (the oxygens and the chlorine), so those bonds are all polar covalent.

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Q:

PET is a very familiar form of _____________. It is used for making bottles.

A) Nylon	B) Acrylic
C) Polyester	D) Rayon

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