0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

# ReasonIn $$\alpha-$$ decay the mass number decreases by $$4$$ and atomic number decreases by $$2$$ In $$\beta-$$ decay the mass number remains unchanged, but atomic number increases by $$1$$ only.Assertion$$z^{X^{A}}$$ undergoes $$2\alpha-$$ decays. $$2\beta-$$ decays and $$2\gamma-$$ decays and the daughter product is $$z-2^{Y^{A-8}}$$$$z^{X^{A}}$$ undergoes $$2\alpha-$$ decays. $$2\beta-$$ decays and $$2\gamma-$$ decays and the daughter product is $$z-2^{Y^{A-8}}$$

A
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
B
Assertion is correct but Reason is incorrect
C
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
D
Both Assertion and Reason are incorrect
Solution
Verified by Toppr

#### Correct option is A. Both Assertion and Reason are correct and Reason is the correct explanation for AssertionAfter the first two $$\alpha$$ decays the mass number will decrease by $$8$$ and the atomic number will decrease by $$4$$ which will make, $$_{z-4}X^{A-8}$$After the next two $$\beta$$ decays, the atomic number will increase by 2 units. The product will be, $$_{z-2}X^{A-8}$$After the last two $$\gamma$$ decays, the atomic number and the mass number will remain unchanged. Final daughter product is$$_{z-2}X^{A-8}$$The assertion is therefore correct and the reason is also correct which is the correct explanation for assertion.The answer is option (A).

0
Similar Questions
Q1
Reason
In $$\alpha-$$ decay the mass number decreases by $$4$$ and atomic number decreases by $$2$$ In $$\beta-$$ decay the mass number remains unchanged, but atomic number increases by $$1$$ only.
Assertion
$$z^{X^{A}}$$ undergoes $$2\alpha-$$ decays. $$2\beta-$$ decays and $$2\gamma-$$ decays and the daughter product is $$z-2^{Y^{A-8}}$$
$$z^{X^{A}}$$ undergoes $$2\alpha-$$ decays. $$2\beta-$$ decays and $$2\gamma-$$ decays and the daughter product is $$z-2^{Y^{A-8}}$$
View Solution
Q2
Assertion :ZXA undergoes 2 αdecays, 2β decays and 2γ - decays and the daughter product is Z2XA8. Reason: In αdecays the mass number decreases by 4 and the atomic number decreases by 2. In 2βdecays the mass number remains unchanged, but atomic number increases by 1 only.
View Solution
Q3
Assertion :ZX4 undergoes 2αdecays,2βdecays (negative β), and 2γdecays. As a result, the daughter product is z2YAB Reason: In αdecay, the mass number decreases by 4 unit and atomic number decreases by 2 unit. In βdecay (negative β), the mass number remains unchanged and atomic number increases by 1 unit. In γdecay, mass number and atomic number remain unchanged.
View Solution
Q4
STATEMENT - 1 : ZXA undergoes 2 α decays, 2β decays (negative β) and 2 decays. As a result the daughter product is
Z2YA8.
STATEMENT -2 : In α decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In β decay (negative β) the mass number remains unchanged and atomic number increases by 1 unit. In γ decay, mass number and atomic number remains unchanged.
View Solution
Q5
Assertion :zXA undergoes 2 α- decays, 2 β- decays (negative β) and 2 γ-decays. As a result , the daughter product is z2YA8 Reason: In α- decay, the mass number decreases by 4 unit and atomic number decreases by 2 unit. In β- decay (negative β), the mass number remains unchanged and atomic number increaess by 1 unit. In γ-decay, mass number and atomic number remain unchanged
View Solution