In the decay sequence: U 92 238 → - x 1 Th 90 234 → - x 2 Pa 91 234 → - x 3 Z 234 → - x 4 Th 90 234 x 1 , x 2 , x 3 and x 4 are the particles/ radiation emitted by the respective isotopes. The correct option(s) is/are:

x 1 will deflect towards the negatively charged plate.

The mass defect of the nuclear reaction B 8 5 → 4 Be 8 + 1 e 0 is Δm . The wrong expression is/are

Δm = atomic mass of Be 8 4 - 5 B 8 + mass of one positron.

Δm = atomic mass of Be 8 4 - 5 B 8 + mass of two electrons.

The mass defect of the nuclear reaction B 8 5 → 4 Be 8 + 1 e 0 is Δm . The wrong expression is/are

Δm = atomic mass of Be 8 4 - 5 B 8 + mass of one positron.

Δm = atomic mass of Be 8 4 - 5 B 8 + mass of two electrons.

EASY

Earn 100

Define magic numbers of nucleus of an atom.

Important Questions on Nuclear Chemistry

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

In the decay sequence:

${}_{92}^{238}U \overset{- x_{1}}{\to} {}_{90}^{234}{Th} \overset{- x_{2}}{\to} {}_{91}^{234}{Pa} \overset{- x_{3}}{\to} {}^{234}Z \overset{- x_{4}}{\to} {}_{90}^{234}{Th}$

$x_{1}, x_{2}, x_{3}$ and $x_{4}$ are the particles/ radiation emitted by the respective isotopes. The correct option(s) is/are:

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

A radioactive sample is emitting

64

times radiations than non-hazardous limit. If its half life is

2 h

, after what time it become non hazardous?

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

{}_{92}^{238}U

is known to undergo radioactive decay to form

{}_{82}^{206}{Pb}

by emitting alpha and beta particles. A rock initially contained

68 \times 10^{- 6} g

{}_{92}^{238}U

. If the number of alpha particles that it would emit during its radioactive decay of

{}_{92}^{238}U

{}_{82}^{206}{Pb}

in three half-lives is

Z \times 10^{18}

, then what is the value of

Z

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

A nucleus

X

captures a

β

particle and then emits a neutron and

γ

ray to form

Y . X

and

Y

are:-

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Predict the element resulting from two

α

decay, two consecutive

β

decay and one

γ

decay of

Th - 232

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

A bacterial infection in an internal wound grows as

N^{'} (t) = N_{0} e x p (t)

, where the time

t

is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as

\frac{d N}{d t} = - 5 N^{2}

. What will be the plot of

\frac{N_{0}}{N}

t

after

1

hour?

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

If the quantity of a radioactive element is doubled, the rate of disintegration will

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Consider, the radioactive disintegration

{}_{82}A^{210} \to B \to C \to {}_{82}D^{206}

The sequence of emission can be

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

In the nuclear transmutation

_{4}^{9} Be + X ⟶_{4}^{8} Be + Y

, identify

(X, Y)

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

If the binding energies of a deuteron and an alpha particle are 1.125MeV and 7.2MeV, respectively , then the more stable of the two is

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

The mass defect of the nuclear reaction

{}_{5}B^{8} \to_{4} {Be}^{8} +_{1} e^{0}

Δm

. The wrong expression is/are

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Assuming that about

200 MeV

of energy is released per fission of

{}_{92}^{235}U

nuclei, then the mass of

{}^{235}U

consumed per day in a fission reactor of power

1

megawatt will be approximately.

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

In the nuclear process,

{{}_{6}C}^{11} \to {{}_{5}B}^{11} + β^{+} + X, X

stands for _______

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Mass of

1 amu

gives energy equal to

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Theory of Radioactive Disintegration

Assume that the nuclear binding energy per nucleon $(B / A)$ versus mass number $(A)$ is as shown in the figure. Use this plot to choose the correct choice given below.

Question Image