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प्रश्न
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar
उत्तर
urea
Urea is the organic compound prepared by Wohler from an inorganic compound called ammonium cyanate.
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संबंधित प्रश्न
What type of bonds are present in water molecule? Draw the electron-dot structure of water (H2O).
What type of bonds are present in methane (CH4) and sodium chloride (NaCl)?
What is the atomic number of carbon. Write its electronic configuration.
What type of chemical bonds are formed by carbon? Why?
How buckminsterfullerene is it related to diamond and graphite?
Draw the electron-dot structure of a hydrogen chloride molecule.
Draw the electron-dot structure of NH3 and state the type of bonding.
A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element X?
(b) Name the allotrope Y.
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
(a) Name the element E.
(b) What is allotrope A.
(c) What is allotrope B?
(d) What is allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making anode of a dry cell?
Explain the following:
polar covalent compounds electricity.
Explain the following term with example.
Hetero atom in a carbon compound
The carbon compound is used in daily life is ______.
Explain the following:
Covalent compounds have low melting and boiling point.
Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.
State the type of bond formed when the combining atom has small E.N. difference.
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?
Write an Explanation.
Alkyne
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc} \phantom{..}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\ \phantom{..}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C- C- H}\\ \phantom{.}|\phantom{....}|\phantom{....}|\\ \ce{H - C - H}\\ |\\\ce{H}\end{array}\] |
Give an example for each of the following statement
A compound in which two Covalent bonds are formed.
Statement (A): Covalent compounds are bad conductors of electricity.
Reason (B): Covalent compounds contain charged particles (ions)
