Chemistry Questions

Q:

The element present in all organic molecules is

A) Hydrogen B) Oxygen
C) Carbon D) None of the above
 
Answer & Explanation Answer: C) Carbon

Explanation:
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Q:

Which two atoms form an ionic bond?

Answer

Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another.. This bond generates two oppositely charged ions.


In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.


 


Example ::


One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.

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Q:

The process of depositing a layer of zinc on iron is called ___________

A) Galvanisation B) Crystallisation
C) Rusting D) Baking
 
Answer & Explanation Answer: A) Galvanisation

Explanation:
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Q:

The chemical name of common salt is

A) Calcium Chloride B) Potassium Chloride
C) Sodium Chloride D) Magnesium Chloride
 
Answer & Explanation Answer: C) Sodium Chloride

Explanation:

The chemical name of common is sodium chloride. Its chemical formula is NaCl.

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Q:

Which of the following is not an allotrope of carbon?

A) Diamond B) Graphene
C) Ethylene D) Buckminsterfullerene
 
Answer & Explanation Answer: C) Ethylene

Explanation:

Allotropes are different structural modifications of an element, that is, each of two or more different physical forms in which an element can exist.

 

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include charcoal, diamond, graphite, buckminsterfullerene and graphene.

 

Hence, Ethylene is not an allotrope of Carbon.

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Q:

Which is the most malleable metal?

A) Gold B) Silver
C) Both A & B D) Bronze
 
Answer & Explanation Answer: A) Gold

Explanation:

The most malleable metal is Gold.

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Q:

Permanent hardness of water may be removed by the addition of

A) Alum B) Lime
C) Sodium Carbonate D) Potassium Permanganate
 
Answer & Explanation Answer: C) Sodium Carbonate

Explanation:

Permanent hardness of water may be removed by the addition of Sodium Carbonate.

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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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