01. Periodic Laws
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Classification of Elements and Periodicity in Properties

89368 Assertion: Both $\mathrm{Be}$ and $\mathrm{Al}$ can form complexes such as $\mathrm{BeF}_4^{2-}$ and $\mathrm{AlF}_6^{3-}$ respectively, $\mathrm{BeF}_6^{3-}$ is not formed.
Reason: In case of $B e$, no vacant d-orbital's are present in its outermost shell.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2015
Classification of Elements and Periodicity in Properties

89379 Lattice energy of an ionic compound depends upon

1 charge on the ion only
2 size of the ion only
3 charge on the ion and size of the ion
4 packing of its ions only
AP - EAMCET(MEDICAL) - 2009
Classification of Elements and Periodicity in Properties

89395 What is the correct relationship between the pH of isomolar solutions of sodium oxide, $\mathrm{Na}_2 \mathrm{O}$ $\left(\mathrm{pH}_1\right)$, sodium sulphide, $\mathrm{Na}_2 \mathrm{~S} \quad\left(\mathrm{pH}_2\right)$, sodium selenide, $\mathrm{Na}_2 \mathrm{Se}\left(\mathrm{pH}_3\right)$ and sodium telluride $\mathrm{Na}_2 \mathbf{T e}\left(\mathrm{pH}_4\right)$ ?

1 $\mathrm{pH}_1>\mathrm{pH}_2>\mathrm{pH}_3>\mathrm{pH}_4$
2 $\mathrm{pH}_1>\mathrm{pH}_2=\mathrm{pH}_3>\mathrm{pH}_4$
3 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3<\mathrm{pH}_4$
4 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3 \approx \mathrm{pH}_4$
NEET-2005
Classification of Elements and Periodicity in Properties

89401 Among the following elements that has the lowest first ionization potential is

1 nitrogen
2 oxygen
3 fluorine
4 neon
A.P.EAMCET 1994
For More Updates join with Us
Classification of Elements and Periodicity in Properties

89368 Assertion: Both $\mathrm{Be}$ and $\mathrm{Al}$ can form complexes such as $\mathrm{BeF}_4^{2-}$ and $\mathrm{AlF}_6^{3-}$ respectively, $\mathrm{BeF}_6^{3-}$ is not formed.
Reason: In case of $B e$, no vacant d-orbital's are present in its outermost shell.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2015
Classification of Elements and Periodicity in Properties

89379 Lattice energy of an ionic compound depends upon

1 charge on the ion only
2 size of the ion only
3 charge on the ion and size of the ion
4 packing of its ions only
AP - EAMCET(MEDICAL) - 2009
Classification of Elements and Periodicity in Properties

89395 What is the correct relationship between the pH of isomolar solutions of sodium oxide, $\mathrm{Na}_2 \mathrm{O}$ $\left(\mathrm{pH}_1\right)$, sodium sulphide, $\mathrm{Na}_2 \mathrm{~S} \quad\left(\mathrm{pH}_2\right)$, sodium selenide, $\mathrm{Na}_2 \mathrm{Se}\left(\mathrm{pH}_3\right)$ and sodium telluride $\mathrm{Na}_2 \mathbf{T e}\left(\mathrm{pH}_4\right)$ ?

1 $\mathrm{pH}_1>\mathrm{pH}_2>\mathrm{pH}_3>\mathrm{pH}_4$
2 $\mathrm{pH}_1>\mathrm{pH}_2=\mathrm{pH}_3>\mathrm{pH}_4$
3 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3<\mathrm{pH}_4$
4 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3 \approx \mathrm{pH}_4$
NEET-2005
Classification of Elements and Periodicity in Properties

89401 Among the following elements that has the lowest first ionization potential is

1 nitrogen
2 oxygen
3 fluorine
4 neon
A.P.EAMCET 1994
NEET DIGITAL LIBRARY
Classification of Elements and Periodicity in Properties

89368 Assertion: Both $\mathrm{Be}$ and $\mathrm{Al}$ can form complexes such as $\mathrm{BeF}_4^{2-}$ and $\mathrm{AlF}_6^{3-}$ respectively, $\mathrm{BeF}_6^{3-}$ is not formed.
Reason: In case of $B e$, no vacant d-orbital's are present in its outermost shell.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2015
Classification of Elements and Periodicity in Properties

89379 Lattice energy of an ionic compound depends upon

1 charge on the ion only
2 size of the ion only
3 charge on the ion and size of the ion
4 packing of its ions only
AP - EAMCET(MEDICAL) - 2009
Classification of Elements and Periodicity in Properties

89395 What is the correct relationship between the pH of isomolar solutions of sodium oxide, $\mathrm{Na}_2 \mathrm{O}$ $\left(\mathrm{pH}_1\right)$, sodium sulphide, $\mathrm{Na}_2 \mathrm{~S} \quad\left(\mathrm{pH}_2\right)$, sodium selenide, $\mathrm{Na}_2 \mathrm{Se}\left(\mathrm{pH}_3\right)$ and sodium telluride $\mathrm{Na}_2 \mathbf{T e}\left(\mathrm{pH}_4\right)$ ?

1 $\mathrm{pH}_1>\mathrm{pH}_2>\mathrm{pH}_3>\mathrm{pH}_4$
2 $\mathrm{pH}_1>\mathrm{pH}_2=\mathrm{pH}_3>\mathrm{pH}_4$
3 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3<\mathrm{pH}_4$
4 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3 \approx \mathrm{pH}_4$
NEET-2005
Classification of Elements and Periodicity in Properties

89401 Among the following elements that has the lowest first ionization potential is

1 nitrogen
2 oxygen
3 fluorine
4 neon
A.P.EAMCET 1994
Join With Us for More Updates
Classification of Elements and Periodicity in Properties

89368 Assertion: Both $\mathrm{Be}$ and $\mathrm{Al}$ can form complexes such as $\mathrm{BeF}_4^{2-}$ and $\mathrm{AlF}_6^{3-}$ respectively, $\mathrm{BeF}_6^{3-}$ is not formed.
Reason: In case of $B e$, no vacant d-orbital's are present in its outermost shell.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2015
Classification of Elements and Periodicity in Properties

89379 Lattice energy of an ionic compound depends upon

1 charge on the ion only
2 size of the ion only
3 charge on the ion and size of the ion
4 packing of its ions only
AP - EAMCET(MEDICAL) - 2009
Classification of Elements and Periodicity in Properties

89395 What is the correct relationship between the pH of isomolar solutions of sodium oxide, $\mathrm{Na}_2 \mathrm{O}$ $\left(\mathrm{pH}_1\right)$, sodium sulphide, $\mathrm{Na}_2 \mathrm{~S} \quad\left(\mathrm{pH}_2\right)$, sodium selenide, $\mathrm{Na}_2 \mathrm{Se}\left(\mathrm{pH}_3\right)$ and sodium telluride $\mathrm{Na}_2 \mathbf{T e}\left(\mathrm{pH}_4\right)$ ?

1 $\mathrm{pH}_1>\mathrm{pH}_2>\mathrm{pH}_3>\mathrm{pH}_4$
2 $\mathrm{pH}_1>\mathrm{pH}_2=\mathrm{pH}_3>\mathrm{pH}_4$
3 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3<\mathrm{pH}_4$
4 $\mathrm{pH}_1>\mathrm{pH}_2<\mathrm{pH}_3 \approx \mathrm{pH}_4$
NEET-2005
Classification of Elements and Periodicity in Properties

89401 Among the following elements that has the lowest first ionization potential is

1 nitrogen
2 oxygen
3 fluorine
4 neon
A.P.EAMCET 1994
For More Updates join with Us