# Nuclear Chemistry Test 3

Total Questions:50 Total Time: 75 Min

Remaining:

## Questions 1 of 50

Question:The carbon dating is based on

$$_6^{15}C$$

$$_6^{14}C$$

$$_6^{13}C$$

$$_6^{11}C$$

## Questions 2 of 50

Question:A possible material for use in the nuclear reactors as a fuel is

Thorium

Zirconium

Beryllium

Plutonium

## Questions 3 of 50

Question:Atom bomb is based on the principle of

Nuclear fusion

Nuclear fission

Fusion and fission both

## Questions 4 of 50

Question:Who observed that when the nucleus of uranium atom was bombarded with fast moving neutrons, it becomes so very unstable that it is immediately broken into two nuclei of nearly equal mass besides other fragments

J.J. Thomson

Einstein

Hahn and Strassmann

## Questions 5 of 50

Question:Deuterium resembles hydrogen in chemical properties but reacts

More vigorously than hydrogen

Faster than hydrogen

Slower than hydrogen

Just as hydrogen

## Questions 6 of 50

Question:Which of the following is heavy water

$${H_2}{O_{18}}$$

$${H_2}{O_{16}}$$

$${H_2}{O_3}$$

$${D_2}O$$

## Questions 7 of 50

Question:For the fission reaction $$_{92}{U^{235}}+{\,_0}{n^1}\to{\,_{56}}B{a^{140}}+{\,_y}{E^x}+2{\,_0}{n^1}$$. The value of $$x$$ and $$y$$ will be

$$x=93$$ and $$y=34$$

$$x=92$$ and $$y=35$$

$$x=89$$ and $$y=44$$

$$x=94$$ and $$y=36$$

## Questions 8 of 50

Question:Heavy water is used as

Control rods

Moderator

Fuel

Coolant

None of these

## Questions 9 of 50

Question:Artificial transmutation was discovered by

Pauli

Rutherford

Soddy

Curie

## Questions 10 of 50

Question:Which of the following is an example of nuclear fusion

$$_1{H^2}+{\,_1}{H^2}\to{\,_2}H{e^4}+$$energy

$$_{92}{U^{235}}+{\,_o}{n^1}\to{\,_{56}}B{a^{141}}+{\,_{36}}K{r^{92}}+{\,_{30}}{n^1}+$$energy

$$_{13}A{l^{27}}+{\,_1}{H^1}\to{\,_{12}}M{g^{24}}+{\,_2}H{e^4}$$

None of these

## Questions 11 of 50

Question:$$_{89}A{c^{231}}$$ gives $$_{82}P{b^{207}}$$ after emission of some $$\alpha$$and $$\beta$$-particles. The number of such $$\alpha$$ and $$\beta$$-particles are respectively

5, 6

6, 5

7, 5

5, 7

## Questions 12 of 50

Question:The number of $$\alpha$$ and $$\beta$$- particles emitted in the nuclear reaction $$_{90}T{h^{228}}{\to_{83}}B{i^{212}}$$ are respectively

4, 1

3, 7

8, 1

4, 7

## Questions 13 of 50

Question:An atom has mass number 232 and atomic number 90. How many $$\alpha$$-particles should it emit after emission of two $$\beta$$-particles, so that the new element's atom has mass number 212 and atomic number 82

4

5

6

3

## Questions 14 of 50

Question:After the emission of one $$\alpha$$-particle followed by one $$\beta-$$particle from the atom of $$_{92}{X^{238}}$$, the number of neutrons in the atom will be

142

146

144

143

## Questions 15 of 50

Question:Whenever the parent nucleus emits a b-particle, the daughter element is shifted in the periodic table

One place to the right

One place to the left

Two places to the right

Two places to the left

## Questions 16 of 50

Question:In the nuclear reaction $$_{92}{U^{238}}{\to_{82}}P{b^{206}}$$, the number of alpha and beta particles decayed are

$$4\alpha,\,3\beta$$

$$8\alpha,\,6\beta$$

$$6\alpha,\,4\beta$$

$$7\alpha,\,5\beta$$

## Questions 17 of 50

Question:When a $$\beta$$-particle emits from the atom of an element, then

Atomic number increases by two units

Atomic number increases by three units

Atomic number decreases by one unit

Atomic number increases by one unit

## Questions 18 of 50

Question:The number of b-particles emitted in radioactive change $$_{92}{U^{238}}{\to_{82}}P{b^{206}}{+_2}H{e^4}$$ is

2

4

6

10

## Questions 19 of 50

Question:A radioactive nucleus will not emit

Alpha and beta rays simultaneously

Beta and gamma rays simultaneously

Gamma and alpha rays

Gamma rays only

## Questions 20 of 50

Question:Loss of a beta particle is equivalent to

Increase of one neutron only

Decrease of one neutron only

Both 1 and 2

None of these

## Questions 21 of 50

Question:Which one of the following pairs represents isobars

$$_2^3He$$ and $$_2^4He$$

$$_{12}^{24}Mg$$ and $$_{12}^{25}Mg$$

$$_{19}^{40}K$$ and $$_{20}^{40}Ca$$

$$_{19}^{39}K$$ and $$_{19}^{40}K$$

## Questions 22 of 50

Question:Nuclei of isotopes differ in

The number of protons

The number of neutrons

The number of protons and neutrons both

None of these

## Questions 23 of 50

Question:Which of the following properties are different for neutral atoms of isotopes of the same element

Mass

Atomic number

General chemical reactions

Number of electrons

## Questions 24 of 50

Question:The isotope $$_{92}{U^{235}}$$ decays in a number of steps to an isotope of lead $$_{82}P{b^{207}}$$. The groups of particles emitted in this process will be

$$4\alpha,\,7\beta$$

$$6\alpha,\,4\beta$$

$$7\alpha,\,4\beta$$

$$10\alpha,\,8\beta$$

Tritium

Deuterium

Para hydrogen

Ortho hydrogen

## Questions 26 of 50

Question:Isotopes of same elements have the same number of

Protons

Neutrons

Deutrons

None

## Questions 27 of 50

Question:The $$_6{C^{14}}$$ in upper atmosphere is generated by the nuclear reaction

$$_7{N^{14}}+{\;_1}{H^1}\to{\;_6}{C^{14}}+{\;_{+1}}{e^0}+{\;_1}{H^1}$$

$$_7{N^{14}}\to{\;_6}{C^{14}}+{\;_{+1}}{e^0}$$

$$_7{N^{14}}+{\;_0}{n^1}\to{\;_6}{C^{14}}+{\;_1}{H^1}$$

$$_7{N^{14}}+{\;_1}{H^3}+{\;_0}{n^1}{\to_6}{C^{14}}+{\;_2}H{e^4}$$

## Questions 28 of 50

Question:Deuterons when bombarded on a nuclide produce $$_{18}A{r^{38}}$$ and neutrons. The target is

$$_{17}C{l^{35}}$$

$$_{19}{K^{27}}$$

$$_{17}C{l^{37}}$$

$$_{19}{K^{39}}$$

## Questions 29 of 50

Question:Which one of the following nuclear transformation is (n, p ) type

$$_3L{i^7}+{\,_1}{H^1}\to{\,_4}B{e^7}+{\,_0}{n^1}$$

$$_{33}A{s^{75}}+{\,_2}H{e^4}\to{\,_{35}}B{r^{78}}+{\,_0}{n^1}$$

$$_{83}B{i^{209}}+{\,_1}{H^2}\to{\,_{84}}P{o^{210}}+{\,_0}{n^1}$$

$$_{21}S{c^{45}}+{\,_0}{n^1}\to{\,_{20}}C{a^{45}}+{\,_1}{H^1}$$

## Questions 30 of 50

Question:What is X in the following nuclear reaction $$_7{N^{14}}+{\;_1}{H^1}{\to_8}{O^{15}}+X$$

$$_{+1}{e^0}$$

$$_0{n^1}$$

$$\gamma$$

$$_{-1}{e^0}$$

## Questions 31 of 50

Question:Which one of the following nuclear reaction is correct

$$_6{C^{13}}{+_1}{H^1}{\to_7}{N^{13}}+{\beta^-}+{v^-}$$

$$_{11}N{a^{23}}{+_1}{H^1}\to{\;_{10}}N{e^{20}}+{\;_2}H{e^4}$$

$$_{13}A{l^{23}}+{\;_0}{n^1}\to{\;_{11}}N{a^{23}}+{e^0}$$

None of these

## Questions 32 of 50

Question:Formation of nucleus from its nucleons is accompanied by

Decrease in mass

Increase in mass

No change of mass

None of them

## Questions 33 of 50

Question:In the nuclear reaction $$_4^9Be(p,\,\alpha)\,X,$$ the X is

$$_2^4He$$

$$_3^6Li$$

$$_3^7Li$$

$$_4^8Be$$

## Questions 34 of 50

Question:Which of the following does not contain number of neutrons equal to that of $$_{18}^{40}Ar$$

$$_{19}^{41}K$$

$$_{21}^{43}Sc$$

$$_{21}^{40}Sc$$

$$_{20}^{42}Ca$$

## Questions 35 of 50

Question:Uranium $$_{92}{U^{235}}$$ on bombardment with slow neutrons produces

Deutrons

Fusion reaction

Fission reaction

Endothermic reaction

## Questions 36 of 50

Question:$$\alpha$$ particles can be detected using

Thin aluminum sheet

Barium sulphate

Zinc sulphide screen

Gold foil

## Questions 37 of 50

Question:Which leaves no track on Wilson cloud chamber

Electrons

Protons

$$\alpha$$-particles

Neutrons

## Questions 38 of 50

Question:Which has the least penetrating power

$$\beta$$-rays

$$\alpha$$-rays

$$\gamma$$-rays

$$X$$-rays

## Questions 39 of 50

Question:Calculate mass defect in the following reaction $$_1{H^2}{+_1}{H^3}{\to_1}H{e^4}{+_0}{n^1}$$(Given : mass $${H^2}=2.014,\,{H^3}=3.016,\,He=4.004,$$ $$n=1.008\,amu$$)

0.018 amu

0.18 amu

0.0018 amu

1.8 amu

18 amu

## Questions 40 of 50

Question:The half-life period of a radioactive substance is 8 years. After 16 years, the mass of the substance will reduce from starting $$16.0g$$ to

$$8.0\,g$$

$$6.0\,g$$

$$4.0\,g$$

$$2.0\,g$$

## Questions 41 of 50

Question:A radioactive substance has $${t_{1/2}}$$60 minutes. After 3 hrs, what percentage of radioactive substance will remain

50%

75%

25%

12.50%

## Questions 42 of 50

Question:A freshly prepared radioactive source of half-life 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

6 hours

12 hours

24 hours

128 hours

## Questions 43 of 50

Question:The binding energy of $$_8{O^{16}}$$ is 127 MeV. Its binding energy per neutron is

0.794 MeV

1.5875 MeV

7.94 MeV

15.875 MeV

## Questions 44 of 50

Question:If the half-life period of a first order reaction is 138.6 minutes, then the value of decay constant for the reaction will be

5 minute$$^{--{\rm{1}}}$$

0.5 minute$$^{--{\rm{1}}}$$

0.05 minute$$^{--{\rm{1}}}$$

0.005 minute$$^{--{\rm{1}}}$$

## Questions 45 of 50

Question:If $$2.0\,g$$ of a radioactive isotope has a half-life of 20 hr, the half-life of $$0.5g$$ of the same substance is

20 hr

80 hr

5 hr

10 hr

## Questions 46 of 50

Question:Radioactive lead $$_{82}P{b^{201}}$$ has a half-life of 8 hours. Starting from one milligram of this isotope, how much will remain after 24 hours

$$1/2\;mg$$

$$1/3\,mg$$

$$1/8\,mg$$

$$1/4\,mg$$

## Questions 47 of 50

Second order reaction

First order reation

Zero order reaction

Third order reaction

## Questions 48 of 50

Question:The half-life of a radioactive element depends upon

The amount of the element

The temperature

The pressure

None of these

## Questions 49 of 50

Question:A radioactive substance takes 20 min to decay 25%. How much time will be taken to decay 75%

96.4 min

68 min

964 min

680 min

## Questions 50 of 50

Question:A radioactive sample is emitting 64 times radiations than non hazardous limit. if its half life is 2 hours, after what time it becomes non-hazardous