Covalent compounds - are formed by the sharing of electrons in the bonding atoms
Graphite is used as a lubricant in machines because - it has a high melting point and slippery layers
The allotrope of carbon which is a good conductor of heat and electricity is - graphite
Ethane, with the molecular formula C 2 H 6 C2H6 has : - 7 covalent bonds
The chemical formulae of propane is : - C3H8
The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound? - 4
A carbon compound contains two atoms of carbon. Which name should the carbon compound bear? - Ethane
Which of the following is the molecular formula of cyclobutane? - C4H8
Choose the correct statement - All the above.
Following is (are) the property(ies) of ionic compounds. - Both
How many single bonds are present in methane? - 4
A hydrocarbon should have a minimum of how many carbon atoms to show isomerism? - 4
The number of isomers of pentane is - 3
In diamond, each carbon atom is bonded to four other carbon atoms to form - a rigid three-dimensional structure
Covalent bonds are formed by the ………. of electrons between two atoms so that both can achieve a completely filled outermost shell. - Sharing
The property of self-linkage among identical atoms to form long chain compounds is known as: - Catenation
Which of the following statements about graphite and diamond is true? - They can undergo the same chemical reactions
How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene? - 60
Which of the followings is the major constituent of the liquefied petroleum gas? - Butane
From which of the following substance pencil lead is formed? - Graphite
Carbon exists in the atmosphere in the form of - carbon monoxide in traces and carbon dioxide
Which of the following is not considered as crystalline allotrope of carbon? - Coal
Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g., hydrogen. After the formation of four bonds, carbon attains the electronic configuration of - neon
Pentane has the molecular formula C5H12. It has - 16 covalent bonds
How many electrons are there in the outermost orbit of carbon? - 4
Which of these is true for most of the organic compounds? - Low melting and boiling points
Hydrocarbons are mainly composed of which of these? - Hydrogen and carbon
Which of the following is not an allotropic form of carbon? - Fluorine
Compounds of carbon with hydrogen are called ......................... - hydrocarbons
The unique property of carbon compound to combine with one another is called --------------- - catenation
Complete combustion of hydrocarbon produces...................... - CO2 and H2O.
Carbon atom forms ......................bond. - covalant
Covalant compounds have high melting points. - False
The earth’s crust has only ............... carbon in the form of minerals (like carbonates, hydrogencarbonates, coal and petroleum) - 0.02%
The earth atmosphere has ........................ of carbon dioxide. - 0.03%
The purest allotropic form of carbon is........................ - graphite
Which consists of carbon atoms? - all of these
Which has a 2D hexagonal layered structure? - graphite
Which has a every carbon atom covalently bonded to three others? - both
Which has weak dispersion forces in between layers? - graphite
