Tag: classification of crystalline solids

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Multiple choice chemistry solid state classification of crystalline solids classification of solids introduction to solids
In a cubic structure of diamond which is made from X and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is
  1. $X _2Y$
  2. $X _3Y$
  3. $XY _2$
  4. $XY _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a cubic unit cell, corner atoms (X) contribute 8 * (1/8) = 1 atom. Face-centered atoms (Y) contribute 6 * (1/2) = 3 atoms. The ratio of X to Y is 1:3, resulting in the formula XY3.

Multiple choice chemistry solid state classification of crystalline solids classification of solids introduction to solids

What is a metallic bonding?

  1. The chemical bonding that takes place from the attraction of metal atoms and the surrounding sea of electrons.

  2. The chemical bonding that takes place from the attraction of metal atoms and the other elements.

  3. The chemical bonding that takes place between metal atoms when they share electrons.

  4. The chemical bonding between electrons.

  5. The chemical bonding that takes place between metal atoms when they transfer electrons.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Metallic bonding: The chemical bonding that takes place from the attraction of metal atoms and the surrounding sea of electrons.
Metallic bonding is the force of attraction between valence electrons and metal ions. It is the sharing of many detached electrons between many positive ions, where the electrons act as a "glue" giving the substance a definite structure. It is unlike covalent or ionic bonding

The electrons and the positive ions in the metal have a strong attractive force between them. Therefore, metals often have high melting or boiling points. The principle is similar to that of ionic bonds.


Hence, the correct option is $\text{E}$

Multiple choice chemistry solid state classification of crystalline solids classification of solids introduction to solids

Silicon carbide is a giant molecule having:

  1. covalent bond

  2. ionic bond

  3. molecular bond

  4. van der waal bond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Electronegativity of silicon $= 1.9$
Electronegativity of carbon $= 2.55$
Electronegativity difference $= 2.55 - 1.9 = 0.65$ (Low) (less than $1.6$)
Hence the bond between $Si$ and $C$ in silicon carbon $(SiC)$ in covalent.