Nuclear Chemistry Test

Result

Nuclear Chemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The least stable radioactive isotope of an element has the largest

A
decay constant

B
mass number

C
half-life

D
atomic number

Solution

Generally the least stable radioactive isotope of an element has the largest decay constant.

The correct answer is: decay constant
Question 2
1 / -0

Which cannot be a member of actinium series, which begins with U²³⁵

A
Ra²²³

B
Pb²¹¹

C
Ac²³⁷

D
Ra²²¹

Solution

Ra²²³ and Pb²¹¹ belong to 4n+3 series but Ra²²¹belongs to 4n+1 series.

The correct answer is: Ra²²¹
Question 3
1 / -0

α-rays have greater ionizing power than β-rays.

α-particles carry two unit positive charge while β-particles carry only one unit negative charge.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

α-particles are much heavier than β-particles and hence have higher momentum.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.