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 Chemistry Questions

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Q:

A solution that is hypotonic to a cell has

A) more water molecules surrounding the cell than inside the cell B) more water molecules inside the cell than outside the cell
C) equal water molecules inside and outside the cell D) None of the above
 
Answer & Explanation Answer: A) more water molecules surrounding the cell than inside the cell

Explanation:
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Q:

Which of the following is a false statement?

A) As bond order increases the strength of the bond increases B) Bond order is proportional to the bond length
C) Molecules with negative bond order are highly unstable D) Bond order is inversely proportional to the bond length
 
Answer & Explanation Answer: B) Bond order is proportional to the bond length

Explanation:

Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.

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Q:

The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?

A) 298 B) 189
C) 109 D) 487
 
Answer & Explanation Answer: C) 109

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Q:

Which type of molecules polar or nonpolar dissolves in water?

Answer

In general, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.
As water molecules are polar, polar molecules dissolves in water.

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Q:

The mass of a mole of NaCl is the

A) 58.44 gm/mol B) 57.25 gm/mol
C) 56.31 gm/mol D) 59.14 gm/mol
 
Answer & Explanation Answer: A) 58.44 gm/mol

Explanation:

To get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl

Atomic weights of Na = 22.99 gm/mol  Cl = 35.45 gm/mol

 

Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.

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Q:

The commonly used coolant in refrigerators is

A) Ammonia B) Nitrogen
C) Freon D) Oxygen
 
Answer & Explanation Answer: C) Freon

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Q:

The main cause of rancidity in foods is the ____ of fats and oils.

A) hydrolysis B) clarification
C) reduction D) oxidation
 
Answer & Explanation Answer: D) oxidation

Explanation:
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Q:

Which of the following is also known as Carbolic Acid?

A) Hydroxide B) Sulphuric Acid
C) Ethanol D) Phenol
 
Answer & Explanation Answer: D) Phenol

Explanation:

Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.

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