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The d-And-f-Block Elements

Multiple Choice Questions

701.
₈₄Rn²¹⁹ is a member of actinium series. The other member of this series is-

₈₉Ac²²⁵

₉₀Th²³²

₁₅P³⁵

₉₂U²³⁵

₉₂U²³⁵

The series 4n + 3 is known as actinium series. Here, if mass numbe ris divided by 4 then the remainder must be 3. Hence, another member of this series is ₉₂U²³⁵.

$∵$ $\frac{235}{4}$ = 58 + Remainder 3

702.

Which one is malachite from the following?

Cu(OH)₂
Fe₃O₄
CuCO₃.Cu(OH)₂
CuFeS₂

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Multiple Choice Questions

701. 84Rn219 is a member of actinium series. The other member of this series is- 89Ac225 90Th232 15P35 92U235

701.
₈₄Rn²¹⁹ is a member of actinium series. The other member of this series is-

₈₉Ac²²⁵

₉₀Th²³²

₁₅P³⁵

₉₂U²³⁵