Nuclear Chemistry Test 2

Total Questions:50 Total Time: 75 Min

Remaining:

Questions 1 of 50

Question:Radioactive carbon dating was discovered by

W.F. Libby

G.N. Lewis

J. Willard Gibbs

W. Nernst

Questions 2 of 50

Question:The nuclear reaction $$_{29}^{63}Cu+_2^4He\to_{17}^{37}Cl+14_1^1H+16_0^1n$$ is referred to as

Spallation reaction

Fusion reaction

Fission reaction

Chain reaction

Questions 3 of 50

Question:Which of the following is used as a moderator in a nuclear reactor

$${D_2}O$$

$${N_2}O$$

$${H_2}O$$

$$NaOH$$

Questions 4 of 50

Question:The fuel of atomic pile is

Thorium

Sodium

Uranium

Petroleum

Questions 5 of 50

Question:Carbon-14 dating method is based on the fact that

Carbon-14 fraction is the same in all objects

Carbon-14 is highly insoluble

Ratio of carbon-14 and carbon-12 is constant

All of these

Questions 6 of 50

Question:Half-life period of a radioactive element is 10.6 yrs. How much time will it take in its 99% decomposition

7046 yrs

7.046 yrs

704.6 yrs

70.4 yrs

Questions 7 of 50

Question:For artificial transmutation of nuclei, the most effective one is

Proton

Deuteron

Helium nuclei

Neutron

Questions 8 of 50

Question:Which of the following cannot be accelerated

$$\alpha$$-particle

$$\beta$$-particle

Protons

Neutrons

Questions 9 of 50

Question:The modern basis of atomic weight is

Isotope $${H^1}=1.000$$

Oxygen = 16.000

Isotope $${O^{16}}=16.000$$

Isotope $${C^{12}}=12.000$$

Questions 10 of 50

Question:Which radioactive carbon has been helpful in understanding the mechanism of photosynthesis in plants

$$_6{C^{14}}$$

$$_6{C^{13}}$$

$$_6{C^{12}}$$

$$_6{C^{15}}$$

Questions 11 of 50

Question:The element with atomic number 84 and mass number 218 change to other element with atomic number 84 and mass number 214. The number of $$\alpha$$ and $$\beta$$-particles emitted are respectively

1, 3

1, 4

1, 2

1, 5

Questions 12 of 50

Question:A radium $$_{88}R{a^{224}}$$ isotope, on emission of an $$\alpha$$-particle gives rise to a new element whose mass number and atomic number will be

220 and 86

225 and 87

228 and 88

224 and 86

Questions 13 of 50

Question:During a $$\beta$$-decay the mass of the atomic nucleus

Decreases by one unit

Increases by one unit

Decreases by two units

Remains unaffected

Questions 14 of 50

Question:Which one of the following notations shows the product incorrectly

$$_{96}^{242}Cm\,(\alpha,\,2n)\,_{97}^{243}Bk$$

$$_5^{10}B\,(\alpha,\,n)\,_7^{13}N$$

$$_7^{14}N\,(n,\,p)\,_6^{14}C$$

$$_{14}^{28}Si\,(d,\,n)\,_{15}^{29}P$$

Questions 15 of 50

Question:A photon of hard gamma radiation knocks a proton out of $$_{12}^{24}Mg$$ nucleus to form

The isotope of parent nucleus

The isobar of parent nucleus

The nuclide $$_{11}^{23}Na$$

The isobar of $$_{11}^{23}Na$$

Questions 16 of 50

Question:$$_{84}P{b^{210}}{ \to _{82}}P{b^{206}}{ + _2}H{e^4}$$. From the above equation, deduce the position of polonium in the periodic table (lead belongs to group IV A)

II A

IV B

VI B

VI A

Questions 17 of 50

Question:The atomic number of a radioactive element increases by one unit in

Alpha emission

Beta emission

Gamma emission

Electron capture

Questions 18 of 50

Question:The end product of $$(4n+1)$$ radioactive disintegration series is

$$_{83}B{i^{209}}$$

$$_{84}P{o^{210}}$$

$$_{82}P{b^{208}}$$

$$_{82}P{b^{207}}$$

Questions 19 of 50

Question:In which radiation mass number and atomic number will not change

$$\alpha$$

$$\beta$$

$$\gamma$$

$$\alpha$$ and $$2\beta$$

Questions 20 of 50

Question:Disintegration constant for a radioactive substance is 0.58$$h{r^{-1}}$$. Its half-life period

8.2 hr

5.2 hr

1.2 hr

2.4 hr

Questions 21 of 50

Question:Isotopes of an element have

Similar chemical properties but different physical properties

Similar chemical and physical properties

Similar physical properties but different chemical properties

Different chemical and physical properties

Questions 22 of 50

Question:Whose number is common in isotopes

Proton

Neutron

Proton and neutron

Nucleon

Questions 23 of 50

Question:Isotopes are those which contain

Same number of neutrons

Same physical properties

Same chemical properties

Different atomic mass

Questions 24 of 50

Question:An element $$'A'$$ emits an $$\alpha$$-particle and forms $$'B'.\,'A'$$ and $$'B'$$ are

Isotopes

Isobars

Isotones

Isodiasphere

Questions 25 of 50

Question:Isotopes differ in

Number of protons

Valency

Chemical reactivity

Number of neutrons

Questions 26 of 50

Question:The isobars are atoms with the same number of

Protons

Neutrons

Protons and neutrons

Nucleons

Questions 27 of 50

Question:Positron has nearly the same weight as that of

$$\alpha$$-particle

Proton

Neutron

Electron

Questions 28 of 50

Question:In the reaction $$_3L{i^6}+(?)\to{\;_2}H{e^4}+{\;_1}{H^3}$$. The missing particle is

Electron

Neutron

Proton

Deutron

Questions 29 of 50

Question:In the nuclear reaction $$_{92}{U^{238}}{\to_{82}}P{b^{206}}+x{\,_2}H{e^4}+y{\,_{-1}}{\beta^0}$$ the value of x and y are respectively ……..

8, 6

6, 4

6, 8

8, 10

Questions 30 of 50

Question:If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be

2 and 1

3 and 1

1 and 1

1 and 3

Questions 31 of 50

Question:Stable nuclides are those whose n/p ratio is

$$n/p=1$$

$$n/p=2$$

$$n/p>1$$

$$n/p<1$$

Questions 32 of 50

Question:Neutrino has

Charge +1, mass 1

Charge 0, mass 0

Charge – 1, mass 1

Charge 0 , mass 1

Questions 33 of 50

Question:Electromagnetic radiation with maximum wavelength is

Ultraviolet ray

X-ray

Infrared

Questions 34 of 50

Question:Neutrons are obtained by

Bombardment of Ra with b-particles

Bombardment of Be with $$\alpha$$-particles

Radioactive disintegration of uranium

None of these

Questions 35 of 50

Question:The radiations having high penetrating power and not affected by electrical and magnetic field are

Alpha rays

Beta rays

Gamma rays

Neutrons

Questions 36 of 50

Question:Alpha particles are ...... times heavier (approximately) than neutrons

2

4

3

$$2\frac{1}{2}$$

Questions 37 of 50

Question:Of the following radiations, the one most easily stopped by air is

$$\alpha$$-rays

$$\beta$$-rays

$$\gamma$$-rays

X-rays

Questions 38 of 50

Question:Uranium ultimately decays into a stable isotope of

Carbon

Neptunium

Questions 39 of 50

Question:Nuclear theory of the atom was put forward by

Rutherford

Aston

Neils Bohr

J.J. Thomson

Questions 40 of 50

Question:Decrease in atomic number is observed during

Alpha emission

Beta emission

Positron emission

Electron capture

Questions 41 of 50

Question:$${C^{14}}$$ is radioactive. The activity and the disintegration product are

$$\beta$$-active, $$_7{N^{14}}$$

$$\alpha$$- active, $$_7B{e^{10}}$$

Positron active, $$_5{B^{14}}$$

$$\gamma$$- active, $${C^{14}}$$

Questions 42 of 50

Question:Radioactivity of a radioactive element remains $$\frac{1}{{10}}$$ of the original radioactivity after 2.303 seconds. The half-life period is

2.303

0.2303

0.693

0.0693

Questions 43 of 50

Question:The half-life of $$_6{C^{14}}$$ if its K or $$\lambda$$ is $$2.31\times{10^{-4}}$$ is

$$2\times{10^2}yrs$$

$$3\times{10^3}yrs$$

$$3.5\times{10^4}yrs$$

$$4\times{10^3}yrs$$

Questions 44 of 50

Question:A radioactive isotope has a half-life of 10 days. If today $$125\,mg$$is left over, what was its original weight 40 days earlier

2g

600 mg

1 g

1.5 g

Questions 45 of 50

Question:The half-life of the radio element $$_{83}B{i^{210}}$$ is 5 days. Starting with 20 g of this isotope, the amount remaining after 15 days is

10 g

5 g

2.5 g

6.66 g

Questions 46 of 50

Question:75% of the first order reaction was completed in 32 minutes. When was 50% of the reaction completed

24 minutes

16 minutes

8 minutes

4 minutes

Questions 47 of 50

Question:The amount of $$_{53}{I^{128}}$$ $${t_{1/2}}=25$$ minutes) left after 50 minutes will be

One – half

One – third

One – fourth

Nothing

Questions 48 of 50

Question:If 3/4 quantity of a radioactive element disintegrates in two hours, its half-life would be

1 hour

45 minutes

30 minutes

15 minutes

Questions 49 of 50

Question:For a reaction, the rate constant is $$2.34{\sec^{-1}}$$. The half-life period for the reaction is

0.30 sec

0.60 sec

3.3 sec

Data is insufficient

Questions 50 of 50

Question:$${T_{1/2}}$$ of $${C^{14}}$$ isotope is 5770 years. time after which 72% of isotope left is