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प्रश्न
One of the following is not an allotrope of carbon. This is:
(a) diamond
(b) graphite
(c) cumene
(d) buckministerfullerene
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उत्तर
cumene
Cumene is not an allotrope of carbon. Allotropes of carbon are diamond, graphite and buckministerfullerene.
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संबंधित प्रश्न
Write the number of covalent bonds in the molecule of butane, C4H10.
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What type of bond is present in oxygen molecule?
Describe the structure of graphite with the help of a labelled diagram.
A saturated hydrocarbon has fifty hydrogen atom in its molecule. The number of carbon atoms in its molecule will be
(a) twenty five
(b) twenty four
(c) twenty six
(d) twenty seven
What do you understand by polar covalent compounds?
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methane
Draw all possible structural formulae of compound from their molecular formula given below.
C3H8
Observe the straight chain hydrocarbons given below and answer the following
questions :
i) Which of the straight chain compounds from A and B is saturated and unsaturated straight chains?
ii) Name these straight chains.
iii) Write their chemical formulae and number of – CH2 - units.
Fill in the blank with correct word from the bracket.
Melting and boiling points of covalent compounds are generally ______ (low, high).
Fill in the blank from the choice given in bracket.
The compound that does not have a lone pair of electrons is ___________. (Water, Ammonia, carbon tetrachloride)
Which of the following is a common characteristic of a covalent compound?
Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound, But, both conduct electricity in their aqueous solutions. Explain.
Number of valence electrons in a carbon atom is _______.
Write a short note.
Aromatic hydrocarbons
The table shows the electronic structures of four elements.
| Element | Electronic Structure |
| P | 2, 6 |
| Q | 2, 8, 1 |
| R | 2, 8, 7 |
| S | 2, 8, 8 |
- Identify which element(s) will form covalent bonds with carbon.
- “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason.
______ is an example of a covalent compound having a high melting point.
Which of the following compound(s) possesses a high melting point?
What is a covalent bond?
The electron dot structure of chlorine molecule is:
