Introduction to d and f Block Elements

Q. Which of the following 3d-metal ion will give the lowest enthalpy of hydration $\left({\Delta }_{\text{hyd}}\text{H}\right)$ when dissolved in water ?

1. ${\text{Mn}}^{2+}$
2. ${\text{Fe}}^{2+}$
3. ${\text{Cr}}^{2+}$
4. ${\text{Co}}^{2+}$

Q. Which of the following are d-block elements?

1. Sodium
2. Zinc
3. Titanium
4. Argon

Q. Which of the following statements is/are true?

1. All lanthanides are radioactive.
2. All actinides are radioactive.
3. Both (A) and (B) are true.
4. Both (A) and (B) are false.

Q. Which of the following do not form hydrides?

1. $Fe$
2. $Co$
3. $Ni$
4. $Pd$

Q. The transition metal among the following is .

1. Zinc
2. Cadmium
3. Mercury
4. Silver

Q. Match the following elements with their corrresponding transition series.

1. 3d series
2. 5d series
3. 6d series
4. 4d series

Q. Which of the following reagents give colored precipitate (except white and black) when treated with Lunar caustic?

1. $N{a}_{3}P{O}_4$ solution
2. $N{a}_2{S}_2{O}_3$ solution (not excess)
3. $N{a}_{2}Cr{O}_4$ solution
4. $N{a}_{2}S$ solution

Q. Group IA alkali metals form covalent hydrides - true or false?

1. True

2. False

Q.

What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?

Q. Cu ___ Ni

1. Cu < Ni
2. Cu = Ni
3. Cu > Ni
4. None of these