Quartz is:

Covalent solid

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Molecular solid

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Ionic solid

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Metallic solid

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Solution

The correct option is
A

Covalent solid
Quarts or silicon dioxide also called silica is made up of a giant network of covalent bonds. Each silicon atom is covalently bonded with four other oxygen atoms. These atoms are in turn bonded to two other silicon atoms and thus form a covalent network of bonds. The compound is represented by the formula $S i O_{2}$ .
In quartz, lattice points made up of non-metal, are held by a covalent bond. Hence, quartz is a covalent crystal. Quartz has strong covalent bonds.

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Q. Solid

C O_{2}

is an example of

Match the following:

(1)Non-polar Molecular solids (i) Coulombic or electrostatic forces

(2)H-Bonded Molecular solids (ii) H-bonding

(3)Ionic solids (iii) Metallic bonding

(4)Covalent solids (iv) Weak dispersion forces

(5)Metallic solids (v) dipole – dipole interaction

(vi) covalent Bonding

Solid CO₂is an example of

Match the following:

$\begin{matrix} C o l u m n I & C o l u m n I I (1) . N o n - p o l a r M o l e c u l a r s o l i d s & (i) C o u l o m b i c o r e l e c t r o s t a t i c f o r c e s (2) . H - B o n d e d M o l e c u l a r s o l i d s & (i i) . H - b o n d i n g (3) . I o n i c s o l i d s & (i i i) . M e t a l l i c b o n d i n g (4) . W e a k d i s p e r s i o n f o r c e s & (i v) . W e a k d i s p e r s i o n f o r c e s (5) . M e t a l l i c s o l i d s & (v) . d i p o l e - d i p o l e i n t e r a c t i o n . (v i) . c o v a l e n t B o n d i n g . \end{matrix}$

Classify each of the following solid as ionic, metallic, molecular, network (covalent) or amorphous.

Tetraphosphorus decoxide $(P_{4} O_{10})$

Ammonium phosphate, $(N H_{4})_{3} P O_{4}$

SiC

$I_{2}$

$P_{4}$

Plastic

Graphite

Brass

LiBr

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