Chemical Bonding and Molecular Structure
Free Online Sample Papers and Notes of Chemistry covering atomic structure, ions, ionic and covalent bonding, molecular polarity, and chemical formulas
Questions
Mass number of atom is expressed by ___________.
- atomic number
- no.of electrons + no. of protons
- no.of protons + no.of neutrons
- none of these
Protons and neutrons are collectively known as ______________.
- particles
- elementary patricles
- nucleus
- nucleons
Positive ion is called _________.
- cation
- anion
- proton
- none of these
Most of the organic compounds form ___________.
- ionic bond
- covalent bond
- double bond
- both a and b
Ionic bond is formed by ________.
- donation of electrons
- donation of protons
- sharing of outermost electron
- sharing of protons
Chlorine is a halogen gas which ______________.
- has a 3 valence electrons
- exists in molecular form
- has complete outermost shell
- none of these
Electrons are found in _______.
- nucleus
- orbitals
- both 1 and 2
- none of these
Which of the following options is a type of bonding?
- Electrovalent
- Single
- Covalent
- Both 1 and 3
Oxygen molecule forms ___________.
- single bond
- two covalent bonds
- one covalent bond
- all of these
Hydrogen molecule is ____________.
- polar
- non-polar
- positively charged
- none of these
Covalent molecules exist as __________.
- solids at room temperature
- gases at room temperature
- both liquids and gases at room temperature
- none of these
Which particles play the most active role in chemical bonding?
- Electrons
- Protons
- Neutrons
- Valence electrons
How many electrons are needed in the outermost energy levels of most atoms for an atom to be chemically stable?
- 2
- 4
- 6
- 8
A molecule that has oppositely charged ends is ____________.
- covalent
- polar
- non-polar
- ionic
Ethylene forms ___________.
- single bond
- one sigma bond and one pi bond
- double bond
- both 2 and 3
An ionic bond is formed when electrons are ____________.
- completely destroyed
- completely transferred
- divided
- shared equally
Ionic bonds are formed ___________.
- between metals and non-metals
- between metals only
- between non-metals only
- none of these
Molecule that does not have oppositively charged ends is called a/an ___________.
- ion
- non-polar molecule
- polar molecule
- cation
A group of atoms that acts as one charged atom is known as __________.
- polyatomic ion
- negative ion
- molecule
- crystal
Sodium chloride forms _________.
- ionic bond
- covalent bond
- double bond
- both a and b
What is Gilbert Lewis's theory of chemical bonding?
- Atoms bond together to fill their valence shells.
- Chemical bond is formed when electrons of an atom interact with each other.
- Chemical bond is formed when protons of an atom interact with each other.
- None of these
In formula of water, 2 attached with hydrogen is ___________.
- subscript
- superscript
- atomic number
- none of these
Ionic compounds tend to form ___________.
- crystalline solids with high temperatures
- amorphous solids
- amorphous solids with high temperatures
- crystalline solids
If a symbol of element in a chemical formula does not have a subscript after it, one unit of that compound contains____ of that element.
- 0 atom
- 1 atom
- 2 atoms
- none of these
Most of the matter around us is in the form of ___________.
- elements
- compounds
- ions
- none of these