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प्रश्न
Fill in the following blank with suitable word:
The form of carbon which is known as black lead is ...........
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उत्तर
The form of carbon which is known as black lead is graphite.
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संबंधित प्रश्न
What are covalent compounds?
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
What would be the electron-dot structure of carbon dioxide which has the formula CO2?
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
Give two general properties of ionic compounds and two those of covalent compounds.
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar
Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?
The electronic configurations of three elements X, Y and Z are as follows:
| X | 2, 4 |
| Y | 2, 7 |
| Z | 2, 1 |
(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
Give two example in following case:
Solid covalent compounds
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 |
Explain the following:
Covalent compounds are generally gases or liquids or soft solids.
Name a neutral covalent molecule which contains one lone pair of electrons.
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.
Taking MgCl2 as an electrovalent compound, CCl4 as a covalent compound, give four difference between electrovalent and covalent compounds
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?
Name a greenish-yellow gas which also bleaches.
Consider the coordination compound, K2[Cu(CN)4]. A coordinate covalent bond exists between:
The I.U.P.A.C name of CH3CH2CH = CH2 is?
It is observed that covalent compounds are had conductors of electricity. Give reason.
