D and F Block Elements MCQ Questions & Answers in Inorganic Chemistry | Chemistry
Learn D and F Block Elements MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
181.
$$F{e^{3 + }}$$ compounds are more stable than $$F{e^{2 + }}$$ compounds because
A
$$F{e^{3 + }}$$ has smaller size than $$F{e^{2 + }}$$
B
$$F{e^{3 + }}$$ has $$3{d^5}$$ configuration ( half - filled )
$$3{d^5}$$ configuration is more stable due to singly occupied half - filled orbitals.
182.
Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $$E_{{M^{3 + }}/{M^{2 + }}}^0$$ value?
183.
Zinc-copper couple that can be used as a reducing agent is obtained by :
A
mixing zinc dust and copper gauze
B
zinc coated with copper
C
copper coated with zinc
D
zinc and copper wires welded together
Answer :
mixing zinc dust and copper gauze
Zinc-copper couple is obtained by mixing zinc dust with copper guaze.
184.
Which of the following statements is wrong?
A
$$T{i^{4 + }}$$ and $$A{g^ + }$$ are repelled by magnetic field.
B
$$M{n^{2 + }}$$ shows maximum magnetic character among the first transition series.
C
$$F{e^{2 + }}$$ is more stable than $$M{n^{2 + }}$$ towards oxidation to +3 state.
D
$$Mn$$ in $$MnO_4^ - $$ ion involves $$s{p^3}$$ hybridisation.
Answer :
$$F{e^{2 + }}$$ is more stable than $$M{n^{2 + }}$$ towards oxidation to +3 state.
No explanation is given for this question. Let's discuss the answer together.
185.
Highest oxidation state of manganese in fluorides is $$ + 4\left( {Mn{F_4}} \right)$$ but highest oxidation state in oxides is $$ + 7\left( {M{n_2}{O_7}} \right)$$ because
A
fluorine is more electronegative than oxygen
B
fluorine does not possess $$d$$ - orbitals
C
fluorine stabilises lower oxidation state
D
in covalent compounds, fluorine can form single bond only while oxygen forms double bond
Answer :
in covalent compounds, fluorine can form single bond only while oxygen forms double bond
Oxygen can form $$p\pi - p\pi $$ bonding while fluorine can form only single bonds.
186.
Which one of the following is a '$$d$$ - block element'?
A
$$Gd$$
B
$$Hs$$
C
$$Es$$
D
$$Cs$$
Answer :
$$Hs$$
No explanation is given for this question. Let's discuss the answer together.
187.
The second and third row elements of transition metals resemble each other much more than they resemble the first row because of
A
lanthanoid contraction which results in almost same radii of second and third row metals
B
diagonal relationship between second and third row elements
C
similar ionisation enthalpy of second and third row elements
D
similar oxidation states of second and third row metals
Answer :
lanthanoid contraction which results in almost same radii of second and third row metals
No explanation is given for this question. Let's discuss the answer together.
188.
Lanthanoid contraction is due to increase in
A
atomic number
B
effective nuclear charge
C
atomic radius
D
valence electrons
Answer :
effective nuclear charge
No explanation is given for this question. Let's discuss the answer together.
189.
In which of the following compounds manganese has oxidation number equal to that of iodine in $$KI{O_4}?$$
A
Potassium manganate
B
Potassium permanganate
C
Dimanganese decacarbonyl
D
Manganese chloride
Answer :
Potassium permanganate
Oxidation number of $$I$$ in $$KI{O_4} = + 7$$
Oxidation number of $$Mn$$ in potassium perrnanganate $$KMn{O_4} = + 7$$
190.
Bell-metal is an alloy of
A
$$Cu + Pb$$
B
$$Cu + Sn$$
C
$$Cu + Zn$$
D
$$Cu + Ni$$
Answer :
$$Cu + Sn$$
Bell-metal is an alloy of copper and tin.
$$Cu$$ = 80% and $$Sn$$ = 20% .
It is used for making bells, utensils, etc.