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The d-And-f-Block Elements

Multiple Choice Questions

331.

For which element the inertness of the electron pair will not be observed?

332.

Composition of azurite mineral is

CuCO₃.CuO
Cu(HCO₃)₂.Cu(OH)₂
2CuCO₃.Cu(OH)₂
CuCO₃.2Cu(OH)₂

333.

When H₂S gas is passed in a metal sulphate solution in presence of NH₄OH, a white precipitate is produced. The metal is identified as:

334.

Which of the following is philosopher's wool ?

ZnO
HgO
Ag₂O
CuO

335.
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

336.

Which one is malachite from the following?

Cu(OH)₂
Fe₃O₄
CuCO₃.Cu(OH)₂
CuFeS₂

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Multiple Choice Questions

335. 84Rn219 is a member of actinium series. The other member of this series is- 89Ac225 90Th232 15P35 92U235

335.
₈₄Rn²¹⁹ is a member of actinium series. The other member of this series is-

₈₉Ac²²⁵

₉₀Th²³²

₁₅P³⁵

₉₂U²³⁵