1099+ Important Chemistry MCQ Questions Answers

Q:

In which of the following activities silicon carbide is used

A) Disinfecting water of ponds	B) Making casts for statues
C) Making cement and glass	D) Cutting very hard substances

Answer & Explanation Answer: D) Cutting very hard substances

Explanation:

In_which_of_the_following_activities_silicon_carbide_is_used1553082795.jpg image

Silicon carbide is used in Cutting very hard substances.

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3 1867

Q:

Which statement best describes the electronegativity of an element?

A) Electronegativity of an atom is it's ability to produce energy while losing an electron.	B) Electronegativity of an atom is it's ability to attract electrons during bond formation.
C) Electronegativity of an atom is it's ability to lose electrons during cation formation.	D) Electronegativity of an atom is it's ability to share electrons during a covalent bond formation.

Answer & Explanation Answer: B) Electronegativity of an atom is it's ability to attract electrons during bond formation.

Explanation:

Electronegativity, is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.

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1 1848

Q:

Which of the following is true about compounds?

A) They are substances	B) They have properties similar to those of their component elements
C) They can be physically separated into their component elements	D) They have compositions that vary

Answer & Explanation Answer: A) They are substances

Explanation:

Compounds are substances is true about them.

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1 1834

Q:

Laterite is chemically classified as

A) argillaceous rock	B) metamorphic rock
C) caleareous rock	D) sillcious rock

Answer & Explanation Answer: A) argillaceous rock

Explanation:

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1 1827

Q:

The current atomic model would be revised if

A) better microscopes are invented in the future	B) a new element is discovered in the future
C) better microscopes were being used to study its structure	D) new information about an atoms structure is discovered

Answer & Explanation Answer: D) new information about an atoms structure is discovered

Explanation:

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1 1822

Q:

Reduction of oxygen which forms water occurs during

A) Respiration	B) Photosynthesis
C) Both A & B	D) Neither photosynthesis nor respiration

Answer & Explanation Answer: A) Respiration

Explanation:

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1 1815

Q:

Conductivity in a metal results from the metal atoms having

A) highly mobile electrons in the valence shell	B) high electronegativity
C) high ionization energy	D) highly mobile protons in the nucleus

Answer & Explanation Answer: A) highly mobile electrons in the valence shell

Explanation:

The outer most electrons that are free to move are called valency electrons that are responsible for the conductivity in the metal atoms.

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1 1807

Q:

What is the general formula of alkenes?

A) CnH2n	B) CnH2n+2
C) CnH2n-2	D) CnH2n-1

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