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प्रश्न
What is diamond? Of what substance is diamond made?
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उत्तर
Diamond, which is a colourless and transparent substance, is an allotrope of carbon. It is the hardest natural substance known. Diamonds are purely made of carbon and the symbol is C. When we burn diamond in oxygen, only carbon dioxide is evolved showing that diamond is made up of carbon.
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संबंधित प्रश्न
Choose the most appropriate answer from the following list of oxides which fit the description.
A covalent oxide of a metalloid.
What would be the electron-dot structure of carbon dioxide which has the formula CO2?
Fill in the blank in the following sentence:
The number of single covalent bonds in C2H2 molecule are ...........
will CS2 conduct electricity or not?
give reason for your choice.
Give the formula of the compound that would be formed by the combination of the following pair of elements:
K and H
Draw the electron-dot structure of CO2 compound and state the type of bonding.
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
The number of isomers formed by the hydrocarbon with molecular formula C5H12 is:
(a) 2
(b) 5
(c) 3
(d) 4
Explain the following term with example.
Unsaturated hydrocarbon
Give examples for the following:
Two gaseous polar compounds.
Explain the following:
Covalent compounds have low melting and boiling point.
(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below
X is likely to have a :
Explain why carbon tetrachloride does not dissolve in water.
What are the term defined below?
A bond formed by share pair of electrons, each bonding atom contributing one electron to the pair.
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 the molecular formula of the given compound.
Acetic acid
Write a short note.
Aromatic hydrocarbons
Explain dipole (polar) molecule by taking hydrogen chloride as an example.
