Tag: introduction to solids

Questions Related to 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
chemistry solid state classification of crystalline solids classification of solids introduction to solids

  1. $X _2Y$

  2. $X _3Y$

  3. $XY _2$

  4. $XY _3$

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Correct Option: D

What is a metallic bonding?

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

  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.

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Correct Option: E
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 $\text{E}$

Silicon carbide is a giant molecule having:

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

  1. covalent bond

  2. ionic bond

  3. molecular bond

  4. van der waal bond

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Correct Option: A
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.

Which of the following have a triclinic system?

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

  1. ${K _2}C{r _2}{O _7}$

  2. $N{a _3}Al{F _6}$

  3. $NaCl$

  4. Quartz

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Correct Option: A
Explanation:

Crystal structures of various systems are:

$K _2Cr _2O _7$ - Triclinic

$NaAlF _6$ - Monoclinic

$NaCl$ - Cubic unitcell (Face centered)

Quartz – TriagonalÂ