TNPSC Chemistry - Chemical Bonding
Exam Duration: 45 Mins Total Questions : 30
Consider the following statements
1. H2 O exists in liquid state whereas H2S in gaseous state because hydrogen bond exist in water and does not exist in H2S.
2. The dipole moment helps to predict whether a molecule in polar or non-polar.
3. Alcohol is non-polar solvent.
4. Ionic compounds are insoluble in non-polar solvent.
Which of the statements given above are correct?
- (a)
1, 2, 3 and 4
- (b)
1, 2 and 3
- (c)
1 and 2
- (d)
2 and 3
The octet rule is not valid for which one of the following molecule?
- (a)
CO2
- (b)
H2S
- (c)
NH3
- (d)
BF3
What are the types of bonds present in CuSO4 .5H2O?
- (a)
Electrovalent and covalent
- (b)
Electrovalent and coordinate
- (c)
Electrovalent, covalent, coordinate and hydrogen bond
- (d)
Covalent and coordinate covalent
Covalent compounds are formed by
- (a)
transfer of electrons
- (b)
sharing of electrons
- (c)
donation of electrons
- (d)
None of the above
In the covalent valency
- (a)
electrons are equally shared by the atoms
- (b)
electrons are one atom are shared with two atoms
- (c)
hydrogen bond is formed
- (d)
None of the above
An atom of sodium loses one electron and chlorine atom accepts one electron. This result the formation of sodium chloride molecule. This type of molecule will be
- (a)
coordinate
- (b)
covalent
- (c)
electrovalent
- (d)
metallic bond
Which of the following contains both ionic and covalent bond?
- (a)
H2O
- (b)
NaOH
- (c)
C6H6
- (d)
CO2
Example of ionic bond are
- (a)
NaCl, KCl, MgF2, CaCl2
- (b)
H2, Cl2, O2, N2, CH2
- (c)
SO2, SO3, O3
- (d)
H2O, NH3
A coordinate bond id formed when an atom in a molecule has
- (a)
electric charge on it
- (b)
all its valency electrons shared
- (c)
a single unshared electron
- (d)
one or more unshared electron
Consider the following statements.
1. Probability of finding the electron in the bonding molecular orbital is more than combining atomic orbitals.
2. Bonding molecular orbitals are formed when different sign of orbitals are overlapped.
Which of the following statements given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
Both 1 and 2
- (d)
Neither 1 nor 2
The methane molecule has
- (a)
double bond
- (b)
triple bond
- (c)
single covalent bond
- (d)
None of the above
Ionic solids
- (a)
are hard and brittle
- (b)
are generally high melting points
- (c)
can be melted to form liquids that are electrical conductors
- (d)
All of the above
Carbon tetrachloride has no net dipole moment because of
- (a)
its planar structure
- (b)
its regular tetrahedral structure
- (c)
similar sizes of carbon and chlorine atoms
- (d)
similar electron affinities of carbon and chlorine
When a chemical bond is formed, there is decrease in
- (a)
kinetic energy
- (b)
potential energy
- (c)
repulsive force
- (d)
attractive force
Which of the following bonds is the weakest?
- (a)
Coordinate bond
- (b)
Hydrogen bond
- (c)
van der Waals' forces
- (d)
Covalent bond
Match Column I with Column II and select the correct answer using the codes given below the Columns.
Column I (Example) |
Column II (Bond angle) |
H2O | 104\(^{o}\)27' |
CO2 | 180\(^{o}\) |
SO2 | 109\(^{o}\)28' |
CH4 | 120\(^{o}\) |
- (a)
A B C D 1 2 4 3 - (b)
A B C D 2 4 3 1 - (c)
A B C D 4 3 1 2 - (d)
A B C D 3 1 2 4
Cation is formed when
- (a)
atom gains electrons
- (b)
atom losses electrons
- (c)
proton is lost by the atom
- (d)
atom shared by electrons
In double covalent bond there is a sharing of
- (a)
two electrons
- (b)
four electrons
- (c)
six electrons
- (d)
three electrons
The bond between two identical non-metallic atom has a pair of electron?
- (a)
Unequally shared between two atoms
- (b)
Transferred completely from one atom to another
- (c)
With identical spins
- (d)
Equally shared between them
Electrovalent compound's
- (a)
melting points are low
- (b)
boiling points are low
- (c)
conduct current in fused state
- (d)
insoluble in polar solvant
Electrovalent bond formation depends on
- (a)
ionisation energy
- (b)
electron affinity
- (c)
lattice energy
- (d)
All of these
Study the following statements
1. A bond formed by the transfer of electrons between atoms of the element is called ionic bond.
2. A bond formed by sharing of electrons between atoms of the electrons is called covalent bond.
Which of the statement given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of these
Consider the following statements.
1. Formation of cations occurs by loss of electrons.
2. Formation of anions occurs by gain of electrons.
Which of the statements given above are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of these
Molten NaCl is a good conductor of electricity is due to
- (a)
free electrons
- (b)
free ions
- (c)
free molecules
- (d)
None of these
Consider the following statements.
1. Metallic bond are malleable and ductile.
2. Covalent compounds are generally non-conductor of electricity.
3. Ionic compounds are good conductor of electricity in molten or liquid state.
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1, 2 and 3
Assertion (A) An ionic bond is formed when metal atom transfer one or more electrons to a non-metal atom.
Reason (R) The metal atom becomes cation and the non-metal the anion.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
Consider the following statements.
1. Strength of certain acid and bases can be explained on the basis of hydrogen bonding.
2. Atcohol and amines are soluble in water due to H-bonding.
Which of the following Statement given above is/are correct?
- (a)
None of these
- (b)
1 and 2
- (c)
Only 1
- (d)
Only 2
Consider the following statements.
1. The dipole moment helps to predict whether a molecule in polar or non-polar.
2. The melting point and boiling point of Coordinate compounds are higher than covalent compound but lesser than the ionic compounds.
Which of the statements given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of the above
Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is
- (a)
sodium hydrogen phthalate
- (b)
magnesium hydroxide
- (c)
calcium hydroxide
- (d)
manganese acetate
On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using
- (a)
carbon dioxide
- (b)
bicarbonate salts
- (c)
both carbon dioxide and bicarbonate salts
- (d)
carbon dioxide and lime