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Explain Why Covalent Compounds Have Generally High Melting Points? - Science

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प्रश्न

Explain why covalent compounds have generally high melting points?

उत्तर

Covalent compounds are made up of electrically neutral molecules. So the force of attraction between the molecules is very weak. Only a small amount of heat energy is required to break these weak molecular forces, due to which covalent compounds have a low melting point.

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पाठ 3: Metals and Non-metals - Exercise 2 [पृष्ठ १६८]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 3 Metals and Non-metals
Exercise 2 | Q 25.1 | पृष्ठ १६८

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Write structural formula of Methane.


List three characteristic properties of covalent compounds.


State the reason to explain why covalent compounds "have low melting and boiling points."


Choose the correct answer from the options given below:

Which of the following is a common characteristic of a covalent compound?

1) high melting point

2) consists of molecules

3) always soluble in water

4) Conducts electricity when it is in the molten state


State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.


Explain why, diamond has a high melting point.


A covalent molecule having a double bond between its atoms is:
(a) Hydrogen
(b) Oxygen
(c) water
(d) ammonia


State the type of bonding in the following molecule.
Hydroxyl ion


Write answer as directed.
What causes the existance of very large number of carbon compound ?


Give examples for the following:
Two liquid non polar compounds.


Choose the correct answer from the options given below
Condition favorable for formation of a covalent bond is


Explain why Carbon tetrachloride does not dissolve in water.


An element L consists of molecules.
Why L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?


Draw the electron dot diagram and structure of nitrogen molecule.


What do you understand by dipole (polar) molecule? 


State the type of bond formed when the combining atom has small E.N. difference.


Define the functional group and complete the following table. 

S.I. No. Functional Group Compound Formula
(1) ______________ _______________

C2H5OH

(2) _______________ _______________ CH3CHO

Identify the incorrect statement and correct them.

  1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
  2. Ionic bond is a weak bond when compared to Hydrogen bond.
  3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
  4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
  5. The electrons which are not involved in bonding are called valence electrons.

In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.


Non-polar covalent compounds are ______ conductors of heat and electricity.


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