Nuclear Chemistry Test 1

Total Questions:50 Total Time: 75 Min



Questions 1 of 50

Question:The first artificial disintegration of an atomic nucleus was achieved by

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Madame curie



Questions 2 of 50

Question:Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element X produced in the following nuclear reaction \(_{95}^{249}Cf+_7^{15}N{\to_{105}}X+4_0^1n\)

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Questions 3 of 50

Question:The proper rays for radiocarbon dating are

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Cosmic rays


Questions 4 of 50

Question:\(_1{H^2}+{\,_1}{H^2}\to{\,_2}H{e^3}+{\,_0}{n^1}\). Above nuclear reaction is called

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Nuclear fission

Nuclear fusion

Artificial transmutation

Spontaneous disintegration

Questions 5 of 50

Question:Large energy released in an atomic bomb explosion is mainly due to

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Products having a lesser mass than initial substance

Conversion of heavier to lighter atoms

Release of neutrons

Release of electrons

Questions 6 of 50

Question:The reaction \(_1{H^2}+{\,_1}{H^3}\to{\,_2}H{e^4}+{\,_0}{n^1}+\)energy represents

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Nuclear fission

Nuclear fusion

Artificial disintegration

Transmutation of element

Questions 7 of 50

Question:\(C-14\) is used in carbon dating of dead objects because

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Its half-life is \({10^3}\) years

Its half-life is \({10^4}\) years

It is found in nature abundantly and in definite ratio

It is found in dead animals abundantly

Questions 8 of 50

Question:A radioactive element resembling iodine in properties is

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Questions 9 of 50

Question:In a nuclear reactor, chain reaction is controlled by introducing

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Iron rod

Cadmium rod

Graphite rod

Platinum rod

Questions 10 of 50

Question:In atomic reactors, graphite is used as a

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Moderator to slow down neutrons


Liner of the reactor

Questions 11 of 50

Question:Radioactive disintegration differs from a chemical change in being

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An exothermic change

A spontaneous process

A nuclear process

A unimolecular first order reaction

Questions 12 of 50

Question:\(_{92}^{238}U\) emits 8 \(\alpha \)-particles and 6 \(\beta \)-particles. The neutron/proton ratio in the product nucleus is

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Questions 13 of 50

Question:\(_{13}^{27}Al\) is a stable isotope. \(_{13}^{29}Al\) is expected to disintegrate by

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Positron emission

Proton emission

Questions 14 of 50

Question:An isotope \(_Y{A^X}\) undergoes a series of \(m\) alpha and \(n\) beta disintegration to form a stable isotope \(_{Y-10}{B^{X-32}}\). The values of \(m\) and \(n\) are respectively

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6 and 8

8 and 10

5 and 8

8 and 6

Questions 15 of 50

Question:What is the symbol for the nucleus remaining after \(_{20}C{a^{42}}\) undergoes \(\beta\)-emission

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Questions 16 of 50

Question:When a radioactive nucleus emits an \(\alpha\)-particle, the mass of the atom

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Increases and its at. number decreases

Decreases and its at. number decreases

Decreases and its at. number increases

Remains same and its at. number decreases

Questions 17 of 50

Question:If the quantity of a radioactive element is doubled, then its rate of disintegration per unit time will be

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Reduced to half

Increased by \(\sqrt2\)times


Questions 18 of 50

Question:The number of\(\alpha \) and \(\beta \) -particles emitted during the transformation of \(_{90}T{h^{232}}\) to \(_{82}{P^{208}}\) are respectively

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4, 2

2, 2

8, 6

6, 4

Questions 19 of 50

Question:The disintegration constant of radium with half-life 1600 years is

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Questions 20 of 50

Question:The number of \(\alpha\) and \(\beta-\)particles emitted in the nuclear reaction \(_{92}{U^{238}}{\to_{90}}T{h^{234}}{\to_{91}}P{a^{234}}\)are respectively

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1 and 1

1 and 2

2 and 1

2 and 2

Questions 21 of 50

Question:Radioactive isotopes that have an excessive neutron/proton ratio generally exhibit

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\({e^-}\) emission

\(_2H{e^4}\) emission

\({e^+}\) emission

K -electron capture

Questions 22 of 50

Question:Atomic weights of carbon, nitrogen and oxygen are 12, 14 and 16 respectively. An atom of atomic weight 14 and nuclear charge + 6 is an isotope of

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None of these

Questions 23 of 50

Question:Which of the following is an isotonic pair

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Questions 24 of 50

Question:\(_6{C^{11}}\) and \(_5{B^{11}}\) are referred as

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Nuclear isomers



Fission products

Questions 25 of 50

Question:Two nuclei which are not identical but have the same number of nucleons represent

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None of the three

Questions 26 of 50

Question:The \(\beta\)-decay of \(_{11}N{a^{24}}\) produces an isotope of

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Questions 27 of 50

Question:On bombarding \(_7{N^{14}}\) with \(\alpha\)-particles, the nuclei of the product formed after the release of a proton will be or In nuclear reaction \(_7{N^{14}}+{\,_2}H{e^4}{\to_Z}{X^A}{+_1}{H^1}\), the term \(_Z{X^A}\) represents

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Questions 28 of 50

Question:Nuclear energy is based on the conversion of

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Protons into neutrons

Mass into energy

Neutrons into protons

Uranium into radium

Questions 29 of 50

Question:In the nuclear reaction \(_{12}M{g^{24}}{+_2}H{e^4}{=_0}{n^1}+?\) The product nucleus is

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Questions 30 of 50

Question:\(_6{C^{14}}\) is formed from \(_7{N^{14}}\) in the upper atmosphere by the action of the fundamental particle

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Questions 31 of 50

Question:In terms of energy 1 a. m.u. is equal to

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100 J

931.1 MeV

931.1 kcal


Questions 32 of 50

Question:Positron is

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Electron with +ve charge

A helium nucleus

A nucleus with two protons

A nucleus with one neutron and one proton

Questions 33 of 50

Question:Which of the following particle is emitted in the reaction \(_{13}A{l^{27}}{+_2}H{e^4}{\to_{14}}{P^{30}}+.....\)

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Questions 34 of 50

Question:Which of the following sub-atomic particles is not present in an atom

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Questions 35 of 50

Question:Which statement is incorrect

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\(\alpha\)-rays have more penetrating power than \(\beta\)-rays

\(\alpha\)-rays have less penetrating power than \(\gamma\)-rays

\(\beta\)-rays have less penetrating power than \(\gamma\)-rays

\(\beta\)-rays have more penetrating power than \(\alpha\)-rays

Questions 36 of 50

Question:The velocity of \(\alpha\)-rays is approximately

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Equal to that of the velocity of light

1/10 of the velocity of light

10 times more than the velocity of light

Uncomparable to the velocity of light

Questions 37 of 50

Question:Choose the element which is not radioactive

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Questions 38 of 50

Question:A magnet will cause the greatest deflection of

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Questions 39 of 50

Question:The charge on gamma rays is

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Questions 40 of 50

Question:A nuclear reaction is accompanied by loss of mass equivalent to \(0.01864\;amu\). Energy liberated is

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Questions 41 of 50

Question:\(10gm\) of a radioactive substance is reduced to \(1.25gm\) after 15 days. Its \(1kg\) mass will reduce (in how many days) to \(500gm\) in

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500 days

125 days

25 days

5 days

Questions 42 of 50

Question:A radioactive isotope having a half-life of 3 days was received after 12 days. It was found that there were 3 gm of the isotope in the container. The initial weight of the isotope when packed was

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12 gm

24 gm

36 gm

48 gm

Questions 43 of 50

Question:What is the value of decay constant of a compound having half-life time \({T_{1/2}}=2.95\) days

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Questions 44 of 50

Question:What kind of radioactive decay does not lead to the formation of a daughter nucleus that is an isobar of the parent nucleus

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\(\alpha \) -Particle

\(\beta \) - Particle


Electron capture

Questions 45 of 50

Question:For a radioactive substance with half-life period 500 years, the time for complete decay of 100 milligram of it would be

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1000 years

\(100\times500\) years

500 years

Infinite time

Questions 46 of 50

Question:A substance of which one gram is taken, after half-life time what fraction of it is left ?

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Questions 47 of 50

Question:Given that a radioactive species decays according to exponential law \(N={N_0}{e^{-\lambdat}}\). The half-life of the species is

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Questions 48 of 50

Question:Half-life of a radioactive disintegration (A \(\to\)B) having rate constant \(231\,{\sec^{-1}}\) is

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\(3.0\times{10^{-2}}\) sec

\(3.0\times{10^{-3}}\) sec

\(3.3\times{10^{-2}}\) sec

\(3.3\times{10^{-3}}\) sec

Questions 49 of 50

Question:A radioactive isotope decays at such a rate that after 192 minutes only \(1/16\) of the original amount remains. The half-life of the radioactive isotope is

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32 min

48 min

12 min

24 min

Questions 50 of 50

Question:Rate constant for a reaction is \(\lambda\). Average life is representative by

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