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प्रश्न
A covalent molecule having a double bond between its atoms is:
(a) Hydrogen
(b) Oxygen
(c) water
(d) ammonia
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उत्तर
(b) Oxygen
In an oxygen molecule, each oxygen atom shares its 2 electrons to complete its octet and forms double covalent bond between them.
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संबंधित प्रश्न
Why covalent compounds are different from ionic compounds?
Explain why carbon forms compounds mainly by covalent bond.
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
How buckminsterfullerene is it related to diamond and graphite?
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
State one test by which sodium chloride can be distinguished from sugar.
The solution of one of the following compounds will not conduct electricity. This compounds is:
(a) NaCl
(b) CCl4
(c) MgCl2
(d) CaCl2
Buckminsterfullerene is an allotropic form of the element:
(a) phoshorus
(b) fluorine
(c) carbon
(d) sulphur
Out of KCl, HCl, CCl4 and NaCl, the compounds which are not ionic are:
(a) KCl and HCl
(b) HCl and CCl4
(c) CCl4 and NaCl
(d) KCl and CCl4
The pencil leads are made of mainly:
(a) lithium
(b) charcoal
(c) lead
(d) graphite
Match the pairs.
| Group 'A' | Group 'B' |
| a. C2H6 | 1. Unsaturated hydrocarbon |
| b. C2H2 | 2. Molecular formula of an alcohol |
| c. CH4O | 3. Saturated hydrocarbon |
| d. C3H6 | 4. Triple bond |
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methanol
Explain the following term with example.
Hetero atom in a carbon compound
Explain the following:
Polar covalent compounds are good conductors of electricity.
Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.
Element A has 2 electrons in its M shell. Element B has atomic number 7.
If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
 |
Although metals form basic oxides, which of the following metals form an amphoteric oxide?
State the reasons, why carbon cannot
- Lose four electrons to form C4+ cation and
- Gain four electrons to form C4- anion.
How does carbon overcome this problem to form compounds?
