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प्रश्न
State one use of diamond which depends on its 'extraordinary brilliance' and one use of graphite which depends on its being 'black and quite soft'.
उत्तर
1. Diamonds are used in making jewellery because of their extraordinary shine and texture.
2.Graphite is used in making pencil leads (black core of pencils) because of its black colour and softness.
APPEARS IN
संबंधित प्रश्न
List three characteristic properties of covalent compounds.
Explain why carbon forms compounds mainly by covalent bond.
How does graphite act as a lubricant?
State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.
What type of bond is present in oxygen molecule?
Why is graphite used for making dry cell electrodes but diamond is not?
Explain why, graphite can be used as a lubricant but diamond cannot.
The number of covalent bonds in pentane (molecular formula C5H12) is:
A covalent molecule having a double bond between its atoms is:
(a) Hydrogen
(b) Oxygen
(c) water
(d) ammonia
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar
A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be
(a) 200
(b) 198
(c) 202
(d) 196
What are the conditions necessary for the formation of covalent molecules?
Give two example in following case:
Liquid non polar compounds
Give examples for the following:
Two gaseous polar compounds.
Electrons are getting added to an element Y:
Is Y getting oxidised or reduced?
Electrons are getting added to an element Y:
which electrode will Y migrate to during the process of electrolysis?
What do you understand by dipole (polar) molecule?
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc}\phantom{......}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\ \phantom{.....}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C = C}\\\phantom{.....}|\phantom{.........}|\\ \phantom{.....}\ce{H}\phantom{........}\ce{H}\end{array}\] |
Identify the incorrect statement and correct them.
- Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity.
- Ionic bond is a weak bond when compared to Hydrogen bond.
- Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms.
- Loss of electrons is called Oxidation and gain of electron is called Reduction.
- The electrons which are not involved in bonding are called valence electrons.
Which of the following is the formula of Butanoic acid?
