What is the valency of carbon in most of its compounds?
4
Question Explanation:
Carbon typically exhibits a valency of 4, forming covalent bonds in most of its compounds.
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Carbon has 4 valence electrons in its outermost shell, hence it is .
tetravalent
Question Explanation:
Carbon is tetravalent, meaning it forms four covalent bonds in its compounds, due to its atomic structure. Carbon has four valence electrons in its outer shell, and it needs to share electrons with other atoms to achieve a stable, octet configuration. By forming four covalent bonds, carbon can complete its outer shell with eight electrons, resembling the stable configuration of noble gases. This tetravalent nature allows carbon to create a diverse range of organic compounds with various structures and properties.
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Weight of Kohinoor Diamond was …..........
186 carats
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Molecular mass of methane is
16
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Melting point of CO2 is …..............
–56.6ºC
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…........... coal contains highest percentage of carbon
Anthracite
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Find the odd man out: Cotton, Silk, Proteins, Wool
Protiens
Question Explanation:
Proteins. Proteins are carbonaceous nutrients while rest all are natural fibres.
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In which form does carbon dioxide exist in the atmosphere?
Gas
Question Explanation:
Carbon dioxide exists in the atmosphere primarily as a gas, contributing to the greenhouse effect.
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Find the odd man out: Coal, Petroleum, Natural gas, Cotton
Cotton
Question Explanation:
Cotton. Cotton is a natural fibre while rest all are fossil fuels.
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…........ is not a property of carbon dioxide gas.
Supporting combustion
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Biogas contains about …........ of methane.
55% to 60%
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Wohler, a German scientist synthesized the compound ….......from an inorganic compound ammonium cyanate
urea
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Find the odd man out: Peat, Charcoal, Lignite, Bituminous
Charcoal
Question Explanation:
Charcoal. Charcoal is a non-crystalline form of carbon while rest all are types of coal
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Which allotrope of carbon is used as a lubricant and is an excellent conductor of electricity?
Graphite
Question Explanation:
Graphite is the allotrope of carbon used as a lubricant and possesses excellent conductivity due to its layered structure.
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H2C = CH2 is …....
Ethene
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Covalent compounds have …..........
low melting point
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Melting point of methane is …........
–182.5ºC
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Methane is ….............
CH4
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Melting point of diamond is
3500ºC
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Find the odd man out: Propane, Methane, Ethene, Pentane.
Ethene
Question Explanation:
Ethene. It is an unsaturated hydrocarbon with double bond between two carbon atoms while rest are saturated hydrocarbons with single bond between two carbon atoms.
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Find the odd man out: Diamond, Fullerene, Graphite, Methane.
Methane
Question Explanation:
Methane. It is a marsh gas while rest are allotropes of carbon.
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Find the odd man out: Lubricants, Electrodes, Ornaments, Arc Lamps
Ornaments
Question Explanation:
Ornaments. Ornaments are made from diamonds while rest all are made from graphite.
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What is the atomic number of carbon?
6
Question Explanation:
The atomic number of carbon is 6, indicating the number of protons in its nucleus.
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Carbon dioxide gas is not used in …...........
Glass cutting
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Methane is also called as …
Marsh Gas
Question Explanation:
Methane is often referred to as "marsh gas" because it is commonly produced in marshy areas. In these environments, organic matter decays anaerobically, leading to the release of methane gas. The name "marsh gas" highlights its association with the natural decomposition of organic material in wet, marshy conditions.
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Ethane with molecular formula C2H6 has …......... covalent bonds.
Seven
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Which important element is a major component of proteins and is essential for life processes?
Nitrogen
Question Explanation:
Nitrogen is an essential element in proteins, playing a crucial role in various life processes.
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