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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:

The reactivity of an atom arises from

A) the existence of unpaired electrons in the valence shell B) the potential energy of the valence shell
C) the average distance of the outermost electron shell from the nucleus D) the sum of the potential energies of all the electron shells
 
Answer & Explanation Answer: A) the existence of unpaired electrons in the valence shell

Explanation:

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

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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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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:

What are the end products of cellular respiration?

A) ATP, Glucose B) Glucose, Oxygen
C) Oxygen, Water D) ATP, Water
 
Answer & Explanation Answer: D) ATP, Water

Explanation:

Cellular respiration is the three-step process by which cells make ATP using glucose and oxygen.

Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP, waste products include carbon dioxide and water.

 

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