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WorksheetsIII BSC Physical Chemistry questions 2024April
Total questions: 50
Worksheet time: 39mins
Green synthesis of nanoparticles involves
harsh chemicals
high temperature
ecofriendly approach
drastic conditions
The properties like dispersibility, conductivity, etc changes on varying the ___________
a) Size
b) Composition
c) Surface properties
d) None of the mentioned
Nano particles target the rare _______ causing cells and remove them from blood.
a) Tumour
b) Fever
c) Infection
d) Cold
Why the properties of nanomaterials are different significantly compared to bulk materials?
Increased relative surface area
Decreased relative surface area
Increased lattice parameters
Lower down the melting temperature
Magnetisation of the material is given by
(χ+1)H
χH
Hχ
HM
which of the following statement is correct about Magnetic susceptibility of the materials
The susceptibility of a para magmetica material is very small and negative
The susceptibility of a dia magmetica material is small and posivive
The susceptibility of a ferro magmetica material is large and positive
All of the above
Which of the following statement is NOT correct about ferro magnetic materials?
When the temperatue is above the Curie temperature the ferro magnetic material will become a papa magnetic material.
Ferro magnetic materials have many domains oriented in different directions.
Ferro magnetic material is not exhibit hysteresis.
The pemeability of a ferro magnetic material is very large
In anti-ferromagnetism, the susceptibility is
large and positive
large and negative
small and positive
small and negative
In hysteresis loss, the loss of energy is in the form of --------------
heat
magnetic
light
electric
Hysteresis curve means
Lagging of M and H behind B
Lagging of H and B behind M
Lagging of M and B behind H
None
Magnetic susceptibility is
Magnetization created by unit electric field
Magnetization created by unit electromagnetic field
Magnetization created by unit magnetic field
polarization created by unit electromagnetic field
One Bohr Magneton value is
9.27X10-24 A/m2
9.27X10-22 A/m2
9.27X10-20 A/m2
9.27X10-26 A/m2
Phase rule is introduced by
Einstein
Willard Gibbs
CV Raman
Aristotle
Phase rule is applicable for ---------- systems with equilibrium.
homogeneous
reversible
heterogeneous
irreversible
An example for one component system is------ system
water
CaCO3
NH4Cl
Sulphur
What is the triple point of a substance?
The triple point of a substance is the temperature and pressure at which the three phases (solid, liquid, and gas) of that substance coexist in thermodynamic equilibrium.
The triple point of a substance is the point at which it turns into a liquid
The triple point of a substance is the point at which it turns into a solid
The triple point of a substance is the point at which it turns into a gas
Why is the triple point important in the phase rule?
It represents the unique combination of temperature and pressure at which all three phases of a substance coexist in equilibrium.
It is only relevant for theoretical purposes
It has no significance in the phase rule
It only applies to a single phase of a substance
Give an example of a substance with a well-known triple point.
sulfuric acid
nitrogen
water
carbon dioxide
What does the Gibbs phase rule state?
The Gibbs phase rule states the relationship between the number of planets, moons, and stars in a solar system
The Gibbs phase rule states the relationship between the number of electrons, protons, and neutrons in an atom
The Gibbs phase rule states the relationship between the number of components, phases, and degrees of freedom in a system at equilibrium.
The Gibbs phase rule states the relationship between temperature, pressure, and volume in a system
How is the number of degrees of freedom related to the number of phases in a system according to the Gibbs phase rule?
F = C - P + 2
F = C - P - 2
F = C + P + 2
F = C + P - 2
Explain the significance of the Gibbs phase rule in determining the number of coexisting phases in a system.
It only considers the number of components in a system
It helps in determining the number of coexisting phases in a system by considering the number of components, the number of phases, and the number of degrees of freedom.
It is only applicable to single-phase systems
It has no significance in determining the number of coexisting phases
What are binary systems in the context of phase rule?
Systems with three components
Systems with two components
Systems with only one component
Systems with four components
How do binary systems differ from unary systems in terms of phase equilibria?
Binary systems have three components, while unary systems have only one component.
Binary systems have two components, while unary systems have only one component.
Binary systems have no phase equilibria, while unary systems have multiple phase equilibria.
Binary systems have solid, liquid, and gas phases, while unary systems have only one phase.
What is the significance of the water system in the study of phase rule?
The water system is too complex to be used as an example
It only applies to solid phases, not liquid or gas phases
It has no significance in the study of phase rule
It provides a simple and well-understood example of a system with multiple phases and components.
Explain the behavior of the water system at its triple point and critical point.
The water system at its triple point only has solid and vapor phases, while at its critical point, the liquid phase disappears.
The water system at its triple point only has solid and liquid phases, while at its critical point, the vapor phase disappears.
The water system at its triple point only has liquid and vapor phases, while at its critical point, the solid phase disappears.
The water system at its triple point exhibits equilibrium between solid, liquid, and vapor phases, while at its critical point, the distinction between liquid and vapor phases disappears.
how many mirror planes are there in ammonia
1
2
3
4
C3 axis means --- rotation
120
30
180
90
water has ------- horizontal plane
1
2
3
0
Principal axis of BF3
C3
C2
C1
Cs
AMMONIA BELONGS TO -----POINT GROUP
C3V
C2V
D2h
C2h
The point group of BF3 Molecule
D3h
C3h
D3d
D3V
The molecule with centre of inversion is
CO2
NH3
H2O
Cis N2F2
The number of symmetry elements of ammonia molecule is
3
4
5
6
The Character for C2(z) matrix operation is
-1
1
0
3
The number of horizontal plane σh plane in BF3 molecule is /are
1
2
3
4
The triple point of the water system is
Univariant
Invariant
Bivariant
Trivariant
The number of triple point in sulphur system (excluding metastable state
)
1
2
3
4
The phase diagram of ferric chloride water have
.......... hydrates
4
6
5
2
The euctectic temperature of NaCl -H2O system is
- 210C
210C
-220C
220C
Sol-gel method is used to prepare nanoparticles
Metal
Metal oxides
Metal Sulphides
metal carbonates
The colour of a colloidal solution of gold nanoparticle is
Red
Yellow
Green
blue
The nano material of 1-10 nm in two dimension is called
Quantum well
Quantum dot
Quantum Wire
all of the above
What are the three types of chirality associated with a carbon nanotube?
crystalline, amorphous and polycrystalline
divergent, convergent and zigzag
chiral, armchair and zigzag
metallic, semiconducting and superconducting
Which of the following is a non-radiative transition between two electronic states of the same spin multiplicity.
Internal conversion
Inter-system crossing
vibrational relaxation
Phosphorescence
Which of the following is a radiative transition between two electronic states of the same spin multiplicity and instantaneous process ?
Phosphorescence
fluorescence
chemiluminescence
photosensitization
which one of the following is a non-radiative transition between two iso-energetic vibrational levels belonging to electronic states of different spin multiplicity
Phosphorescence
Inter-system crossing
Fluorescence
internal conversion
____________ is a radiative transition between two electronic states of different spin multiplicity and occurs for a longer time even after the source is cut off.
Fluorescence
Phosphorescence
Bio-luminescence
Photo-sensitization
Photochemical Combination of H2 with Cl2 has a high quantum yield because of following reasons. Multiple answers may be selected .
Absorption of radiations in the first step involves production of atoms or free radicals, which initiate a series of chain reactions
The active molecules may collide with other molecules and activate them
Excited molecules may lose their energy by collisions with non-excited molecules
Molecules may not receive sufficient energy to enable them to react
commercial analytical instruments used for Nitric oxide detection in air is based on reaction with ozone resulting in the formation of nitrogen dioxide in activated state . This technique is based on which of the following processes ?
Photosensitization
phosphorescence
chemiluminescence
Fluorescence
