Work, Energy and Power
Motion of System of Particles and Rigid Body
Gravitation
Behaviour of Perfect Gas and Kinetic Theory
Current Electricity
Magnetic Effects of Current and Magnetism
Electromagnetic Induction and Alternating Currents
Electromagnetic Waves
Optics
Uncategorized
Physical World and Measurement
Kinematics
Vectors
Laws of Motion
Properties of Bulk Matter
Thermodynamics
Oscillations and Waves
Electrostatics
Dual Nature of Matter and Radiation
Atoms and Nuclei
Electronic Devices & Semiconductor
Communication System

Solutions
Electrochemistry
Chemical Kinetics
Surface Chemistry
General Principles and Processes of Isolation of Elements
Some Basic Concepts of Chemistry
Structure of Atom
Classification of Elements and Periodicity in Properties
Chemical Bonding and Molecular Structure
States of Matter: Gases and Liquids
Equilibrium
Redox Reactions
Hydrogen
s-Block Element (Alkali and Alkaline earth metals)
Some p-Block Elements
Organic Chemistry- Some Basic Principles and Techniques
Hydrocarbons
Environmental Chemistry
Solid State
p-Block Elements
d and f Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Organic Compounds Containing Nitrogen
Amines
Biomolecules
Polymers
Chemistry in Everyday Life
Thermodynamics
Uncategorized
Nuclear Chemistry

Coordinate Geometry (2D)
Mathematical Reasoning
Statistics and Probability
Vectors and Three-Dimensional Geometry
Uncategorized
Sets, Relations and Functions
Permutations and Combinations
Linear Programming
Matrices and Determinants
Logarithm, Indices, Surds and Partial Fraction
Correlation and Regression
Trigonometry
Principle of Mathematical Induction
Complex Numbers and Quadratic Equations
Linear Inequalities
Binomial Theorem
Sequence and Series
Conic Sections
Differential Calculus
Limits, Continuity and Differentiability
Integral Calculus
Differential Equations
Coordinate Geometry
Straight Lines

Nuclear Chemistry

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 1. If the atomic masses of Lithium, Helium and Proton are 7.01823 amu, 4.00387 amu and 1.00815 amu respectively, calculate the energy that will be evolved in the reaction. .

(Given that 1 amu = 931 MeV)

17.3 MeV

17.8 MeV

17.2 MeV

17.0 MeV

Total mass of the reacting species

and

The mass of the resulting species

amu

Mass of reacting species converted into energy, i.e., amu

Energy evolved in the reaction

MeV.

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 2. Calculate the mass defect and binding energy per nucleon for . [The mass of , mass of hydrogen atom = 1.008142 amu and mass of neutron = 1.008982 amu].

8.77 MeV

8.25 MeV

9.01 MeV

8.00 MeV

Number of protons in

Number of neutrons = 59 - 27 = 32

The binding energy per nucleon

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 3. Calculate the number of neutrons in the remaining atom after emission of an alpha particle from atom

146

145

144

143

On account of emission of an alpha particle, the atomic mass is decreased by 4 units and atomic number by 2 units

So, Atomic mass of daughter element = 234

Atomic number of daughter element = 90

Number of neutrons = Atomic mass - Atomic number

= 234 - 90 = 144

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 4. Radioactive disintegration of takes place in the following manner into

, Determine mass number and atomic number of RaC.

214 and 84

214 and 86

214 and 83

214 and 85

Parent element is

Atomic mass = 226

Atomic number = 88

RaC is formed after the emission of 3 alpha particles. Mass of 3 alpha particles

So Atomic mass of RaC

With emission of one α-particle, atomic number is decreased by 2 and with emission of β-particle, atomic number is increased by 1.

So Atomic number of RaC

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 5. How many 'α and β' particles will be emitted when changes into

2 and 6

4 and 2

2 and 4

6 and 2

The change is;

Decrease in mass

Mass of 1 α-particle

Therefore, number of α-particles emitted

Number of β-particles emitted

Hence number of α-particles = 4 and number of β-particles = 2

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 6. The isotopes and occur in nature in the ratio of 140 : 1. Assuming that at the time of earth formation, they were present in equal ratio, make an estimation of the age of earth. The half life period of and are and years respectively

years

years

years

years

Let the age of the earth be t years

For ......(i)

For ......(ii) Subtracting eq. (ii) from eq. (i)

years

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 7. The value of amu is which of the following?

1.57 × 10^{-24} kg

1.66 × 10^{-24} kg

1.99 × 10^{-23} kg

1.66 × 10^{-27} kg

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 8.

Positrons

neutrons

protons

electrons

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 9.

**Correct Marks**
4

**Incorrectly Marks**
-1

Q 10.

Your request has been placed successfully.