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(A): Radium is a natural source of two n...

(A): Radium is a natural source of two noble gases
(R): Radium undergoes `alpha`-emission spontaneously 

A

a. Both A & R are true, R is the correct explanation of A

B

b. Both A & R are true, R is not correct explanation of A

C

c. A is true, R is false

D

d. A is false, R is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion (A) and the reason (R) provided. ### Step 1: Understand the Assertion (A) The assertion states that "Radium is a natural source of two noble gases." We need to identify which noble gases are produced from radium. ### Step 2: Understand the Reason (R) The reason states that "Radium undergoes alpha-emission spontaneously." We need to understand what alpha-emission is and how it relates to the production of noble gases. ### Step 3: Analyze Alpha-Emission Alpha-emission is a type of radioactive decay where an alpha particle (which is essentially a helium nucleus, consisting of 2 protons and 2 neutrons) is emitted from a nucleus. When radium (specifically radium-226) undergoes alpha-emission, it transforms into radon-222, which is a noble gas. ### Step 4: Identify the Noble Gases From the decay of radium, we can see that: - Radium (Ra) decays to produce radon (Rn) and emits an alpha particle (which is helium, He). - Therefore, the two noble gases produced from radium are radon (Rn) and helium (He). ### Step 5: Conclusion Since both the assertion and the reason are true, and the reason correctly explains the assertion, we conclude that the answer is: - Both A and R are true, and R is the correct explanation of A. ### Final Answer The correct option is: Both A and R are true, and R is the correct explanation of A. ---
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