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.

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The radioactive isotope $_{90}^{234} Th$ undergoes two successive $β -$ decay followed by $α$ decay. The atomic number and the mass number respectively of the resulting isotope are

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Important Questions on Nuclear Chemistry

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Nuclear Reactions

In the nuclear transmutation

_{4}^{9} Be + X ⟶_{4}^{8} Be + Y

, identify

(X, Y)

EASY

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The energy released when

3 g

of material is completely converted into energy during a nuclear reaction is (given, speed of light =

3 \times 10^{8} m / s

MEDIUM

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^{227} A c

has a half-life of 22 years with respect to radioactive decay. The decay follows two parallel paths:

^{227} Ac \to^{227} T h

and

^{227} Ac \to^{223} F r

. If the percentage of the two daughter nuclides are

2.0

and

98.0

, respectively the decay constant (in

y e a r^{- 1}

) for

^{227} Ac \to^{227} T h

path is closest to

HARD

Chemistry>Physical Chemistry>Nuclear Chemistry>Nuclear Reactions

{}_{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

EASY

Chemistry>Physical Chemistry>Nuclear Chemistry>Nuclear Reactions

In the radioactive disintegration series

_{90}^{232} T h \to_{82}^{208} P b,

involving

α

and

β

decay, the total number of

α

and

β

particles emitted are

MEDIUM

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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

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In the nuclear reaction

{}_{13}{Al}^{27} + {}_{2}{He}^{4} ⟶ {}_{14}X^{30} + {}_{1}H^{1}, X

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The ratio of the binding energies of three nuclei is

1 : 4 : 9

. If the ratio of their nuclear radii is

1 : 2 : 3

, the nuclei in the decreasing order of the stability can be arranged as

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Give an example of a natural radioactive element.

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The amount of material that releases

4.5 \times 10^{14} J

of energy when it is completely converted into energy during a nuclear reaction. [Given speed of light =

3 \times 10^{8} m / s

]

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Consider, the radioactive disintegration

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

The sequence of emission can be

EASY

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The explosion of atom bomb is based on the principle of

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The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

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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:

MEDIUM

Chemistry>Physical Chemistry>Nuclear Chemistry>Nuclear Reactions

A nucleus

X

captures a

β

particle and then emits a neutron and

γ

ray to form

Y . X

and

Y

are:-

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In the radioactive decay process

Question Image

1. A and B are isobars

2. A and D are isotopes

3. C and D are isobars

4. A and C are isotopes

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

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For a nuclear reactor

48 KJ

of energy is produced per minute. If the energy released per fission is

3.2 \times 10^{- 11} J

then the number of fissions which would be taking place in a reactor per second is

EASY

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What is a chain reaction ?

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In nuclear transmutation

_{8} O^{16} {(A, B)}_{7} N^{13}

A

and

B

are respectively

The radioactive isotope 90 234 Th undergoes two successive β -decay followed by α decay. The atomic number and the mass number respectively of the resulting isotope are

Important Questions on Nuclear Chemistry

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The radioactive isotope $_{90}^{234} Th$ undergoes two successive $β -$ decay followed by $α$ decay. The atomic number and the mass number respectively of the resulting isotope are