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प्रश्न
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
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उत्तर
sixty
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is 60.
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संबंधित प्रश्न
What type of bond is present in oxygen molecule?
Which inert gas does the Cl atom in HCl resemble in electron arrangement?
Describe the structure of graphite with the help of a labelled diagram.
The electronic configurations of two elements A and B are given below:
| A | 2, 6 |
| B | 2, 8, 1 |
(a) What type of chemical bond is formed between the two atoms of A?
(b) What type of chemical bond will be formed between the atoms of A and B?
Give the formulae of the chlorides of the elements X and Y having atomic numbers of 3 and 6 respectively. Will the properties of the two chlorides be similar or different? Explain your answer.
What do you understand by polar covalent compounds?
Write answer as directed.
Saturated hydrocarbons are classified into three types. Write these names giving one example each.
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.
Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non polar covalent bond.
Explain the following briefly:
Cl2 is a non polar molecule, while HCl is a polar molecule.
Explain the following:
Non-polar covalent compounds are insoluble 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?
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)
Explain the following:
Water is a polar covalent molecule.
What are Allotropes? Name any two allotropic forms of carbon. Give one use of it.
Write the molecular formula of the given compound.
Propylene
Write scientific reason.
Benzene compounds are called aromatic compounds.
Which of the following compounds of carbon does not consist of ions?
What is a covalent bond?
"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.
