Advertisements
Advertisements
Question
Why is graphite used for making dry cell electrodes but diamond is not?
Advertisements
Solution
Graphite is a good conductor of electricity. Therefore, it is used for making dry cell electrodes. Whereas, diamond does not conduct electricity, as it has no free electrons and all its valence electrons go into the formation of strong covalent bonds.
APPEARS IN
RELATED QUESTIONS
Give appropriate scientific reasons for Carbon tetrachloride does not conduct electricity.
What type of bonds are present in Cl2 molecule? Draw their electron-dot structures.
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
Fill in the following blank with suitable word:
The general formula CnH2n for cycloalkanes is the same as that of ...........
Give two general properties of ionic compounds and two those of covalent compounds.
Explain why, diamond is hard while graphite is soft (though both are made of carbon atoms).
Draw the electron-dot structure of NH3 and state the type of bonding.
One of the following contains a double bond as well as single bonds. This is:
(a) CO2
(b) O2
(c) C2H4
(d) C2H2
State the type of bonding in the following molecule.
Ammonium ion
Give two example in following case:
Solid covalent compounds
Distinguish between ionic and covalent compounds under the following properties:
(i) Strength of forces between constituent elements
(ii) Solubility of compounds in water
(iii) Electrical conduction in substances
Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non polar covalent bond.
Explain the structure of Hydronium ion.
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Fill in the blank with correct word from the bracket.
Melting and boiling points of covalent compounds are generally ______ (low, high).
Give reason as to why hydrogen chloride can be termed as a polar covalent compound.
Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.
Explain the following:
Water is a polar covalent molecule.
Name the anion present in the following compound:
When a barium chloride solution is added to a solution of compound B, a white precipitate insoluble in dilute hydrochloric acid is formed.
The number of electrons in the valence shell of a carbon atom is 4.
