NEET Test Series from KOTA - 10 Papers In MS WORD
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Classification of Elements and Periodicity in Properties
89460
Which of the following pairs has the same size?
1 $\mathrm{Fe}^{2+}, \mathrm{Ni}^{2+}$
2 $\mathrm{Zr}^{4+}, \mathrm{Ti}^{\cdot+}$
3 $\mathrm{Zr}^{4+}, \mathrm{Hf}^{4+}$
4 $\mathrm{Zn}^{2+}, \mathrm{Hf}^{4+}$
Explanation:
$\mathrm{Zr}^{4+}$ and $\mathrm{Hf}^{4+}$ belonging to the same group of second and third transition series is due to the effect of lanthanide contraction.
COMEDK-2015
Classification of Elements and Periodicity in Properties
89461
Atomic radii of which metals are same?
1 $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Cu}$
2 $\mathrm{Cr}, \mathrm{Fe}, \mathrm{Co}$
3 $\mathrm{Sc}, \mathrm{Ti}, \mathrm{Zn}$
4 $\mathrm{V}, \mathrm{Ni}, \mathrm{Cr}$
Explanation:
Atomic radius is inversely proportional to the effective nuclear charge. On moving from left to right in a period the effective nuclear charge increases, the number of electron in the $3 \mathrm{~d}$ sub-shell will increases. This repel the already present 4 s electrons. Hence, $\mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Cu}$ are nearly balance the atomic radius same.
CG PET- 2015
Classification of Elements and Periodicity in Properties
89462
Decrease in ionic size in a period is observed in
1 actinides
2 lanthanides
3 both (a) and (b)
4 transition elements
Explanation:
Actinides and Lanthanides decrease in ionic size in a period is observed because increase in atomic number and the atomic size increases which attracts the outermost shell more effectively then they gradual decrease in atomic and ionic radii.
SRMJEEE - 2014
Classification of Elements and Periodicity in Properties
89463
The increasing order of the atomic radius of $\mathrm{Si}$, $\mathrm{S}, \mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$ is
All these elements belong to the third period of periodic table, on moving from left to right in a period, effective nuclear charge increase due to atomic radius decreases. The order is $\mathrm{Na}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}>\mathrm{S}$
Classification of Elements and Periodicity in Properties
89460
Which of the following pairs has the same size?
1 $\mathrm{Fe}^{2+}, \mathrm{Ni}^{2+}$
2 $\mathrm{Zr}^{4+}, \mathrm{Ti}^{\cdot+}$
3 $\mathrm{Zr}^{4+}, \mathrm{Hf}^{4+}$
4 $\mathrm{Zn}^{2+}, \mathrm{Hf}^{4+}$
Explanation:
$\mathrm{Zr}^{4+}$ and $\mathrm{Hf}^{4+}$ belonging to the same group of second and third transition series is due to the effect of lanthanide contraction.
COMEDK-2015
Classification of Elements and Periodicity in Properties
89461
Atomic radii of which metals are same?
1 $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Cu}$
2 $\mathrm{Cr}, \mathrm{Fe}, \mathrm{Co}$
3 $\mathrm{Sc}, \mathrm{Ti}, \mathrm{Zn}$
4 $\mathrm{V}, \mathrm{Ni}, \mathrm{Cr}$
Explanation:
Atomic radius is inversely proportional to the effective nuclear charge. On moving from left to right in a period the effective nuclear charge increases, the number of electron in the $3 \mathrm{~d}$ sub-shell will increases. This repel the already present 4 s electrons. Hence, $\mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Cu}$ are nearly balance the atomic radius same.
CG PET- 2015
Classification of Elements and Periodicity in Properties
89462
Decrease in ionic size in a period is observed in
1 actinides
2 lanthanides
3 both (a) and (b)
4 transition elements
Explanation:
Actinides and Lanthanides decrease in ionic size in a period is observed because increase in atomic number and the atomic size increases which attracts the outermost shell more effectively then they gradual decrease in atomic and ionic radii.
SRMJEEE - 2014
Classification of Elements and Periodicity in Properties
89463
The increasing order of the atomic radius of $\mathrm{Si}$, $\mathrm{S}, \mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$ is
All these elements belong to the third period of periodic table, on moving from left to right in a period, effective nuclear charge increase due to atomic radius decreases. The order is $\mathrm{Na}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}>\mathrm{S}$
Classification of Elements and Periodicity in Properties
89460
Which of the following pairs has the same size?
1 $\mathrm{Fe}^{2+}, \mathrm{Ni}^{2+}$
2 $\mathrm{Zr}^{4+}, \mathrm{Ti}^{\cdot+}$
3 $\mathrm{Zr}^{4+}, \mathrm{Hf}^{4+}$
4 $\mathrm{Zn}^{2+}, \mathrm{Hf}^{4+}$
Explanation:
$\mathrm{Zr}^{4+}$ and $\mathrm{Hf}^{4+}$ belonging to the same group of second and third transition series is due to the effect of lanthanide contraction.
COMEDK-2015
Classification of Elements and Periodicity in Properties
89461
Atomic radii of which metals are same?
1 $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Cu}$
2 $\mathrm{Cr}, \mathrm{Fe}, \mathrm{Co}$
3 $\mathrm{Sc}, \mathrm{Ti}, \mathrm{Zn}$
4 $\mathrm{V}, \mathrm{Ni}, \mathrm{Cr}$
Explanation:
Atomic radius is inversely proportional to the effective nuclear charge. On moving from left to right in a period the effective nuclear charge increases, the number of electron in the $3 \mathrm{~d}$ sub-shell will increases. This repel the already present 4 s electrons. Hence, $\mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Cu}$ are nearly balance the atomic radius same.
CG PET- 2015
Classification of Elements and Periodicity in Properties
89462
Decrease in ionic size in a period is observed in
1 actinides
2 lanthanides
3 both (a) and (b)
4 transition elements
Explanation:
Actinides and Lanthanides decrease in ionic size in a period is observed because increase in atomic number and the atomic size increases which attracts the outermost shell more effectively then they gradual decrease in atomic and ionic radii.
SRMJEEE - 2014
Classification of Elements and Periodicity in Properties
89463
The increasing order of the atomic radius of $\mathrm{Si}$, $\mathrm{S}, \mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$ is
All these elements belong to the third period of periodic table, on moving from left to right in a period, effective nuclear charge increase due to atomic radius decreases. The order is $\mathrm{Na}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}>\mathrm{S}$
Classification of Elements and Periodicity in Properties
89460
Which of the following pairs has the same size?
1 $\mathrm{Fe}^{2+}, \mathrm{Ni}^{2+}$
2 $\mathrm{Zr}^{4+}, \mathrm{Ti}^{\cdot+}$
3 $\mathrm{Zr}^{4+}, \mathrm{Hf}^{4+}$
4 $\mathrm{Zn}^{2+}, \mathrm{Hf}^{4+}$
Explanation:
$\mathrm{Zr}^{4+}$ and $\mathrm{Hf}^{4+}$ belonging to the same group of second and third transition series is due to the effect of lanthanide contraction.
COMEDK-2015
Classification of Elements and Periodicity in Properties
89461
Atomic radii of which metals are same?
1 $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Cu}$
2 $\mathrm{Cr}, \mathrm{Fe}, \mathrm{Co}$
3 $\mathrm{Sc}, \mathrm{Ti}, \mathrm{Zn}$
4 $\mathrm{V}, \mathrm{Ni}, \mathrm{Cr}$
Explanation:
Atomic radius is inversely proportional to the effective nuclear charge. On moving from left to right in a period the effective nuclear charge increases, the number of electron in the $3 \mathrm{~d}$ sub-shell will increases. This repel the already present 4 s electrons. Hence, $\mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Cu}$ are nearly balance the atomic radius same.
CG PET- 2015
Classification of Elements and Periodicity in Properties
89462
Decrease in ionic size in a period is observed in
1 actinides
2 lanthanides
3 both (a) and (b)
4 transition elements
Explanation:
Actinides and Lanthanides decrease in ionic size in a period is observed because increase in atomic number and the atomic size increases which attracts the outermost shell more effectively then they gradual decrease in atomic and ionic radii.
SRMJEEE - 2014
Classification of Elements and Periodicity in Properties
89463
The increasing order of the atomic radius of $\mathrm{Si}$, $\mathrm{S}, \mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$ is
All these elements belong to the third period of periodic table, on moving from left to right in a period, effective nuclear charge increase due to atomic radius decreases. The order is $\mathrm{Na}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}>\mathrm{S}$
