MCQ on D and F Block Elements

The d-block elements are the 40 elements contained in the four rows of ten columns. As all the d-block elements are metallic the term d-block metals are synonymous. This set of d-block elements is also often identified as the transition metals. The elements of the fourth d-block row are synthetic and radioactive. The lanthanides and actinides which are placed below the periodic table are known as f-block elements. The f-block elements are also referred to as the inner transition elements.

1. The number of unpaired electrons in gaseous species of Mn³⁺, Cr³⁺ and V³⁺ respectively are:

1. 4, 4 and 2
2. 3, 3 and 2
3. 4, 3 and 2
4. 3, 3 and 3

Answer: (c)

2. Gun metal is an alloy of:

1. Cu and Al
2. Cu and Sn
3. Cu, Zn and Sn
4. Cu, Zn and Ni

Answer: (c)

3. Which one of the following elements shows the maximum number of different oxidation states in its compounds?

1. Eu
2. La
3. Cd
4. Am

Answer: (d)

4. When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is

1. sulphur dioxide
2. ammonia
3. carbon monoxide
4. carbon dioxide

Answer: (c)

5. Zinc and mercury do not show variable valency like d-block elements because

1. they are soft
2. their d-shells are complete
3. they have only two electrons in the outermost subshell.
4. their d-shells are incomplete

Answer: (b)

6. Which of the following products are obtained when Na₂CO₃ is added to a solution of copper sulphate?

1. Basic copper carbonate , sodium sulphate and CO₂
2. Copper hydroxide, sodium sulphate and CO₂
3. Copper carbonate, sodium sulphate and CO₂
4. Copper carbonate and sodium sulphate

Answer: (d)

7. The pair that has similar atomic radii is

1. Mn and Re
2. Ti and Hf
3. Sc and Ni
4. Mo and W

Answer: (d)

8. Silver nitrate produces a black stain on the skin due to

1. being a strong reducing agent
2. its corrosive action
3. formation of complex compound
4. its reduction to metallic silver

Answer: (d)

9. According to IUPAC nomenclature sodium nitroprusside dihydrate is named as

1. Sodium pentacyanonitrosylferrate (III)
2. Sodium nitroferrocyanide
3. Sodium nitroferricyanide
4. Sodium pentacyanonitrosylferrate (II)

Answer: (a)

10. In Fe(CO)₅, the Fe-C bond possesses:

1. ionic character
2. sigma character only
3. pi character
4. both sigma and pi characters

Answer: (d)

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