BITSAT Chemistry The D And F Block Element MCQs

Question: Cadmium is used in nuclear reactors for?

a) Absorbing neutrons

b) Cooling

c) Release neutrons

d) Increase energy

Answer: Absorbing neutrons

Question: Knowing that the chemistry of lanthanoids(Ln) is dominated by its + 3 oxidation state, which of the following statements is incorrect?

a) The ionic size of Ln (III) decrease in general with increasing atomic number

b) Ln (III) compounds are generally colourless.

c) Ln (III) hydroxide are mainly basic in character

d) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character

Answer: Ln (III) compounds are generally colourless.

Question: Which of the following arrangements does not represent the correct order of the property stated against it ?

a) V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺ :paramagnetic behaviour

b) i²⁺ < Co²⁺ < Fe²⁺ < Mn²⁺ : ionic size

c) Co³⁺ < Fe³⁺ < Cr³⁺ < Sc³⁺ : stability in aqueous solution

d) Sc < Ti < Cr < Mn : number of oxidation states

Answer: V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺ :paramagnetic behaviour

Question: The number of elements present in the d-block of the periodic table is

a) 40

b) 41

c) 45

d) 46

Answer: 40

Question: Which one of given elements shows maximum number of different oxidation states in its compounds?

a) Am

b) Fm

c) La

d) Gd

Answer: Am

Question: Thomas slag is

a) Ca₃(PO₄)₂

b) CaSiO₃

c) Mixture of (a) and (b)

d) FeSiO₃

Answer: Mixture of (a) and (b)

Question: K₄[Fe(CN)₆] is used in detecting

a) Fe³⁺ ion

b) Cu⁺ ion

c) Cu³⁺ ion

d) Fe²⁺ ion

Answer: Fe³⁺ ion

Question: Which form coloured salts

a) Non-metals

b) Metals

c) p-block elements

d) Transitional elements

Answer: Transitional elements

Question: An extremely hot copper wire reacts with steam to give

a) CuO

b) Cu₂O

c) Cu₂O₂

d) CuO₂

Answer: Cu₂O

Question: Which of the following does not have valence electron in 3d-subshell?

a) Fe (III)

b) Mn (II)

c) Cr (I)

d) P (0)

Answer: P (0)

Question: Among the following the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by

a) MnSO₄.4H₂O

b) CuSO₄.5H₂O

c) FeSO₄.6H₂O

d) NiSO₄.6H₂O

Answer: CuSO₄.5H₂O

Question: Which of the following halides is not oxidized by MnO₂

a) F^–

b) Cl^–

c) Br^–

d) I^–

Answer: F^–

Question: Which of the following exhibit only + 3 oxidation state ?

a) U

b) Th

c) Ac

d) Pa

Answer: Ac

Question: Which of the following pairs has the same size?

a) Fe²⁺ , Ni²⁺

b) Zr⁴⁺ , Ti⁴⁺

c) Zr⁴⁺ , Hf ⁴⁺

d) Zn²⁺ , Hf ⁴⁺

Answer: Zr⁴⁺ , Hf ⁴⁺

Question: In the manufacture of iron from haematite, limestone is added to act as :

a) Flux

b) Slag

c) A reducing agent

d) An oxidizing agent

Answer: Flux

Question: Cinnabar is an ore of

a) Hg

b) Cu

c) Pb

d) Zn

Answer: Hg

Question: Which of the following is used in the preparation of chlorine?

a) Only MnO₂

b) Only KMnO₄ 

c) Both MnO₂ and KMnO₄

d) Either MnO₂ or KMnO₄

Answer: Both MnO₂ and KMnO₄

Question: Which of the following elements does not belong to first transition series?

a) Fe

b) V

c) Ag

d) Cu

Answer: Ag

Question: Percentage of silver in the alloy ‘german silver’ is

a) 1.5%

b) 2.5%

c) 10%

d) Zero %

Answer: Zero %

Question: If an aqueous solution of KCN is added to a solution of ferrous salt then the complex formed is represented by

a)

b)

c)

d)

Answer:

Question: What is the effect of shaking dil. H₂SO₄ with a small quantity of anhydrous CuSO₄

a) The white solid dissolves to form a colourless solution

b) The white solid dissolves to form a blue solution

c) The white solid dissolves to form a green solution

d) The white solid turns blue but does not dissolve

Answer: The white solid dissolves to form a blue solution

Question: Titanium shows magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of Ti in the compound?

a) + 1

b) + 4

c) + 3

d) + 2

Answer: + 3

Question: Blue virtriol is :

a) MgSO₄.5H₂O

b) uSO₄.5H₂O

c) aSO₄.5H₂O

d) ZnSO₄.5H₂O

Answer: uSO₄.5H₂O

Question: Arrange Ce³⁺, La³⁺, Pm³⁺ and Yb³⁺ in increasing order of their ionic radii

a) Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺

b) Ce³⁺ < Yb³⁺ < Pm³⁺ < La³⁺

c) Yb³⁺ < Pm³⁺ < La³⁺ < Ce³⁺

d) Pm³⁺ < La³⁺ < Ce³⁺ < Yb^3+.

Answer: Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺

Question: The number of elements present in the d-block of the periodic table is

a) 40

b) 41

c) 45

d) 46

Answer: 40