MCQ
The effect caused by lanthanoid contraction is :
- ASame oxidation state of Zr and Nb .
- ✓Zr and Hf have almost same atomic size.
- CZr and Y have almst same atomic size.
- DSame oxidation state of Zr and Zn .
✓
Answer
Correct option: B.
Zr and Hf have almost same atomic size.
b
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
→Assertion $A$ : $Image-I$ can be easily reduced using $Zn - Hg / HCl$ to $Image-II$
Reason $R : Zn - Hg / HCl$ is used to reduce carbonyl group to $- CH _2-$ group.
In the light of the above statements, choose the correct answer from the options given below:
The unit of velocity constant in case of zero order reaction is
Which of the following statements are true for an fuel cells
A galvanic cell with electrode potential of $'A' = + 2.23\;V$ and $'B' = - 1.43\;V$. The value of $E{^o _{cell}}$ is .............. $\mathrm{V}$
→Consider the statements $S_1$ and $S_2$:
$S_1$: Conductivity always increases with decrease in the concentration of electrolyte.
$S_2$: Molar conductivity always increases with decrease in the concentration of electrolyte.
The correct option among the following is
→$S_1$: Conductivity always increases with decrease in the concentration of electrolyte.
$S_2$: Molar conductivity always increases with decrease in the concentration of electrolyte.
The correct option among the following is
Assertion : Anilinium chloride is more acidic than ammonium chloride.
Reason : Anilinium ion is resonance stabilized
Reason : Anilinium ion is resonance stabilized
If $E_{A{u^ + }/Au}^o$ is $1.69\, volt$ and $E_{A{u^{ + 3}}/Au}^o$ is $1.40\, volt$ then $E_{A{u^ + }/A{u^{ + 3}}}^o$ will be ........... $\mathrm{V}$
→Etherates are
Which of the following compounds will give racemic mixture by $S_N1$ reaction ?
→unknown $(A)$ is
→