Which of the following do not have carbon as their constituent element?
Carbon is not a constituent of water. Water is formed from oxygen and hydrogen.
In an ethane molecule two pairs of electrons are shared between the two carbon atoms.
In an ethane molecule a pair of electrons is shared between the two carbon atoms.
The valency of carbon is ____.
The valency of carbon is 4 as it has 4 valence electrons.
The electronic configuration of carbon is 2,5.
The electronic configuration of carbon is 2,4.
Metals react with non-metals to form ionic compounds by ____.
Metals react with non-metals to form ionic compounds by transfer of electrons.
Which of the following metals are poor conductors of heat?
Lead and mercury are poor conductors of heat.
The number of electrons involved in the formation of a single bond is ____.
In the formation of a single bond, 2 electrons are involved.
A covalent bond is represented by the Lewis electron dot structure.
A covalent bond is represented by the Lewis electron dot structure.
Which of the following is a liquid at room temperature?
Mercury is the only metal that is liquid at room temperature.
Which of the following is the best conductor of heat?
Silver is the best conductor of heat.
Alloy of ____ is used in making aircrafts.
An alloy of aluminium, duralumin is used in of making aircrafts.
The electronic configuration of carbon is ____.
The electronic configuration of carbon is 2,4.
Atoms like oxygen and chlorine ____ the electrons to form stable molecules such as O2 and Cl2.
Atoms like oxygen and chlorine shares the electrons to form molecules such as O2 and Cl2.
Which of the following are bad conductors of electricity?
Hg and Pb are bad conductors of electricity since, they offer high resistance to the flow of current.
The number of electron(s) lost , gained or shared by atom of an element to form a chemical bond to attain stable electronic configuration is called ____.
The number of electrons lost, gained or shared by atom of an element to form a chemical bond is called valency.
Which of the following non-metals exist in different states?
Carbon exists in different forms.
Presence of two electrons in valence shell of atom of element is calls ____ configuration.
Presence of two electrons in the valence shell of atom of an element is called duplet configuration.
A covalent bond is represented by the electron dot structure.
A covalent bond is represented by the electron dot structure.
Which of the following symbol represents a single covalent bond?
A single covalent bond is represented by "−".
The number of carbon atoms present in one molecule of ethane is ____.
One molecule of ethane has 2 carbon atoms.
Covalent compounds have ____.
Covalent compounds possess low melting and boiling points.
In the formation of sodium chloride , ____loses the electron(s) to attain stable electronic configuration of ____.
In the formation of sodium chloride , sodium loses one electron to attain stable electronic configuration of neon i.e. 2 , 8.
The carbon atom can only form ____ bond.
The carbon atom always forms covalent bond by sharing of electrons.
Which gas is liberated when metals react with acids?
Hydrogen gas is liberated when metals react with acids.
The number of electrons a carbon atom requires to attain an octet configuration is ____.
A carbon atom requires 4 electrons to attain an octet configuration.
Chloroform is a covalent compound.
Chloroform is a covalent compound, as it is formed by sharing electrons between carbon and chlorine atoms.
Which one of the following is not a covalent carbon compound?
Baking soda is not a covalent carbon compound but an ionic compound.
In a methane molecule a carbon atom has an octet configuration.
In a methane molecule a carbon atom has an octet configuration.
____ group in the periodic table having minimum energy.
We Know Energy and stability are inversely related Zero group elements are highly stable due to their stable electronic configuration. As zero group elements stability is maximum, energy is minimum.
The type of covalent bond present in a nitrogen molecule is a ____.
In a nitrogen molecule, a triple covalent bond is present between the two nitrogen atoms.
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