# 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

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