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 Chemistry Questions

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Q:

Which compound contains ionic bonds?

A) CaO B) CO2
C) NO2 D) NO
 
Answer & Explanation Answer: A) CaO

Explanation:

An ionic bond is a chemical bond between two atoms in which one atom seems to donate its electron to another atom.

 

Here in the given compounds, the compound that contains ionic bond is CaO, Calcium oxide.

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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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Q:

Compounds are formed as a result of chemica change.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

TRUE, the compounds are formed as a result of chemical change.

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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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Q:

Which kind of energy is stored in a chemical bond?

A) Potential energy B) Kinetic energy
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) Potential energy

Explanation:
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Q:

Removal of oil and grease from sewage [waste water]

A) Skimming B) Filtration
C) Screening D) None of the above
 
Answer & Explanation Answer: A) Skimming

Explanation:

Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.

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Q:

Which has the lowest freezing point?

A) Mercury B) Helium
C) Cesium D) Aluminium
 
Answer & Explanation Answer: B) Helium

Explanation:

Helium has the lowest freezing point of all the elements. When coming to metals, mercury has the lowest freezing point of all the metals.

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Q:

Which chemical bond most likely stores the most energy?

A) Single bond B) Double bond
C) Both A & B D) None of the above
 
Answer & Explanation Answer: B) Double bond

Explanation:
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