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 Chemistry Questions

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Q:

Which atom has the largest radius?

A) Neon B) Francium
C) Helium D) Cesium
 
Answer & Explanation Answer: B) Francium

Explanation:

which_atom_has_the_largest_radius1537434800.gif image

In the periodic table, the atomic radius increases from top to bottom in the groups and it increases from right to left in the periods.

 

Francium is the atom with largest atomic radius. Helium is the atom with smallest radius.

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Q:

Which choice best describes the polarity of BrF5?

A) nonpolar bonds / nonpolar molecule B) nonpolar bonds / polar molecule
C) polar bonds / polar molecule D) polar bonds / nonpolar molecule
 
Answer & Explanation Answer: C) polar bonds / polar molecule

Explanation:
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Q:

The water molecule has a dipole with the negative portion

A) localized on one of the hydrogens B) localized between the hydrogen atoms
C) pointing toward the oxygen atom D) pointing from the oxygen through the hydrogen atoms
 
Answer & Explanation Answer: C) pointing toward the oxygen atom

Explanation:

The water molecule has a dipole with the negative portion pointing toward the oxygen atom.

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Q:

Which is a pair of allotropes?

A) carbon-16 and carbon-12 B) diamond and graphite
C) carbon dioxide and graphite D) diamond and carbon dioxide
 
Answer & Explanation Answer: B) diamond and graphite

Explanation:

Allotropes are the different physical forms of an element. Here in the given options, diamond and graphite are the pair of allotropes of carbon.

 

Some more examples are Molecular oxygen and ozone are pair of allotropes, Black and red phosphorous are also pairs of allotropes.

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Q:

When the nucleus of  Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called

A) nuclear fission B) nuclear fusion
C) physical change D) artificial radioactivity
 
Answer & Explanation Answer: A) nuclear fission

Explanation:
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Q:

Which of the following is the mixture

A) distilled water B) gasoline
C) liquified petroleum gas D) both (b) & (c)
 
Answer & Explanation Answer: D) both (b) & (c)

Explanation:
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Q:

Which is the Lightest of all the metals?

A) Hydrogen B) Lithium
C) Sodium D) Pottasium
 
Answer & Explanation Answer: B) Lithium

Explanation:

Lithium is the lightest of all the metals due to its low atomic number among meetals

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Q:

Neutrino has

A) charge +1, mass 1 B) charge 0, mas 0
C) charge -1,mass 1 D) charge 0, mass 1
 
Answer & Explanation Answer: B) charge 0, mas 0

Explanation:
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