00. Valency and Oxidation State
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Classification of Elements and Periodicity in Properties

89304 Identify the incorrect statement from the following

1 Lithium is the strongest reducing agent among the alkali metals.
2 Alkali metals react with water to form their hydroxides.
3 The oxidation number of $\mathrm{K}$ in $\mathrm{KO} 2$ is +4 .
4 Ionisation enthalpy of alkali metals decreases from top to bottom in the group
NEET-17.07.2022
Classification of Elements and Periodicity in Properties

89305 The average oxidation number of bromine in $\mathrm{Br}_3 \mathrm{O}_8$ is

1 $\frac{16}{3}$
2 $\frac{4}{3}$
3 $\frac{3}{4}$
4 $\frac{5}{2}$
5 $\frac{8}{3}$
Kerala CEE -03.07.2022
Classification of Elements and Periodicity in Properties

89318 Which oxidation state for nitrogen is correctly given ?
Compound
Oxidation

1 $\mathrm{NH}_3$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \quad+1$
3 $\mathrm{Mg}_3 \mathrm{~N}_2-3$
4 $\mathrm{NH}_2 \mathrm{OH} \quad+1$
BCECE-2016
Classification of Elements and Periodicity in Properties

89306 Given below are statements:
Statement I : The pentavalent oxide of group -15 element, $\mathrm{E}_2 \mathrm{O}_5$, is less acidic than trivalent oxide, $\mathrm{E}_2 \mathrm{O}_3$ of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $\mathrm{E}_2 \mathrm{O}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

1 Both Statement I and Statement II are true
2 Both Statement I and Statement II are false
3 Statement I. true, but Statement II is false
4 Statement I. false, but Statement II is true
Shift-I
Classification of Elements and Periodicity in Properties

89308 In which of the following compounds an element exhibits two different oxidation states?

1 $\mathrm{N}_2 \mathrm{H}_4$
2 $\mathrm{N}_3 \mathrm{H}$
3 $\mathrm{NH}_2 \mathrm{CONH}_2$
4 $\mathrm{NH}_4 \mathrm{NO}_3$
Shift-II
NEET DIGITAL LIBRARY
Classification of Elements and Periodicity in Properties

89304 Identify the incorrect statement from the following

1 Lithium is the strongest reducing agent among the alkali metals.
2 Alkali metals react with water to form their hydroxides.
3 The oxidation number of $\mathrm{K}$ in $\mathrm{KO} 2$ is +4 .
4 Ionisation enthalpy of alkali metals decreases from top to bottom in the group
NEET-17.07.2022
Classification of Elements and Periodicity in Properties

89305 The average oxidation number of bromine in $\mathrm{Br}_3 \mathrm{O}_8$ is

1 $\frac{16}{3}$
2 $\frac{4}{3}$
3 $\frac{3}{4}$
4 $\frac{5}{2}$
5 $\frac{8}{3}$
Kerala CEE -03.07.2022
Classification of Elements and Periodicity in Properties

89318 Which oxidation state for nitrogen is correctly given ?
Compound
Oxidation

1 $\mathrm{NH}_3$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \quad+1$
3 $\mathrm{Mg}_3 \mathrm{~N}_2-3$
4 $\mathrm{NH}_2 \mathrm{OH} \quad+1$
BCECE-2016
Classification of Elements and Periodicity in Properties

89306 Given below are statements:
Statement I : The pentavalent oxide of group -15 element, $\mathrm{E}_2 \mathrm{O}_5$, is less acidic than trivalent oxide, $\mathrm{E}_2 \mathrm{O}_3$ of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $\mathrm{E}_2 \mathrm{O}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

1 Both Statement I and Statement II are true
2 Both Statement I and Statement II are false
3 Statement I. true, but Statement II is false
4 Statement I. false, but Statement II is true
Shift-I
Classification of Elements and Periodicity in Properties

89308 In which of the following compounds an element exhibits two different oxidation states?

1 $\mathrm{N}_2 \mathrm{H}_4$
2 $\mathrm{N}_3 \mathrm{H}$
3 $\mathrm{NH}_2 \mathrm{CONH}_2$
4 $\mathrm{NH}_4 \mathrm{NO}_3$
Shift-II
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Classification of Elements and Periodicity in Properties

89304 Identify the incorrect statement from the following

1 Lithium is the strongest reducing agent among the alkali metals.
2 Alkali metals react with water to form their hydroxides.
3 The oxidation number of $\mathrm{K}$ in $\mathrm{KO} 2$ is +4 .
4 Ionisation enthalpy of alkali metals decreases from top to bottom in the group
NEET-17.07.2022
Classification of Elements and Periodicity in Properties

89305 The average oxidation number of bromine in $\mathrm{Br}_3 \mathrm{O}_8$ is

1 $\frac{16}{3}$
2 $\frac{4}{3}$
3 $\frac{3}{4}$
4 $\frac{5}{2}$
5 $\frac{8}{3}$
Kerala CEE -03.07.2022
Classification of Elements and Periodicity in Properties

89318 Which oxidation state for nitrogen is correctly given ?
Compound
Oxidation

1 $\mathrm{NH}_3$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \quad+1$
3 $\mathrm{Mg}_3 \mathrm{~N}_2-3$
4 $\mathrm{NH}_2 \mathrm{OH} \quad+1$
BCECE-2016
Classification of Elements and Periodicity in Properties

89306 Given below are statements:
Statement I : The pentavalent oxide of group -15 element, $\mathrm{E}_2 \mathrm{O}_5$, is less acidic than trivalent oxide, $\mathrm{E}_2 \mathrm{O}_3$ of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $\mathrm{E}_2 \mathrm{O}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

1 Both Statement I and Statement II are true
2 Both Statement I and Statement II are false
3 Statement I. true, but Statement II is false
4 Statement I. false, but Statement II is true
Shift-I
Classification of Elements and Periodicity in Properties

89308 In which of the following compounds an element exhibits two different oxidation states?

1 $\mathrm{N}_2 \mathrm{H}_4$
2 $\mathrm{N}_3 \mathrm{H}$
3 $\mathrm{NH}_2 \mathrm{CONH}_2$
4 $\mathrm{NH}_4 \mathrm{NO}_3$
Shift-II
For More Updates join with Us
Classification of Elements and Periodicity in Properties

89304 Identify the incorrect statement from the following

1 Lithium is the strongest reducing agent among the alkali metals.
2 Alkali metals react with water to form their hydroxides.
3 The oxidation number of $\mathrm{K}$ in $\mathrm{KO} 2$ is +4 .
4 Ionisation enthalpy of alkali metals decreases from top to bottom in the group
NEET-17.07.2022
Classification of Elements and Periodicity in Properties

89305 The average oxidation number of bromine in $\mathrm{Br}_3 \mathrm{O}_8$ is

1 $\frac{16}{3}$
2 $\frac{4}{3}$
3 $\frac{3}{4}$
4 $\frac{5}{2}$
5 $\frac{8}{3}$
Kerala CEE -03.07.2022
Classification of Elements and Periodicity in Properties

89318 Which oxidation state for nitrogen is correctly given ?
Compound
Oxidation

1 $\mathrm{NH}_3$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \quad+1$
3 $\mathrm{Mg}_3 \mathrm{~N}_2-3$
4 $\mathrm{NH}_2 \mathrm{OH} \quad+1$
BCECE-2016
Classification of Elements and Periodicity in Properties

89306 Given below are statements:
Statement I : The pentavalent oxide of group -15 element, $\mathrm{E}_2 \mathrm{O}_5$, is less acidic than trivalent oxide, $\mathrm{E}_2 \mathrm{O}_3$ of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $\mathrm{E}_2 \mathrm{O}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

1 Both Statement I and Statement II are true
2 Both Statement I and Statement II are false
3 Statement I. true, but Statement II is false
4 Statement I. false, but Statement II is true
Shift-I
Classification of Elements and Periodicity in Properties

89308 In which of the following compounds an element exhibits two different oxidation states?

1 $\mathrm{N}_2 \mathrm{H}_4$
2 $\mathrm{N}_3 \mathrm{H}$
3 $\mathrm{NH}_2 \mathrm{CONH}_2$
4 $\mathrm{NH}_4 \mathrm{NO}_3$
Shift-II
NEET DIGITAL LIBRARY
Classification of Elements and Periodicity in Properties

89304 Identify the incorrect statement from the following

1 Lithium is the strongest reducing agent among the alkali metals.
2 Alkali metals react with water to form their hydroxides.
3 The oxidation number of $\mathrm{K}$ in $\mathrm{KO} 2$ is +4 .
4 Ionisation enthalpy of alkali metals decreases from top to bottom in the group
NEET-17.07.2022
Classification of Elements and Periodicity in Properties

89305 The average oxidation number of bromine in $\mathrm{Br}_3 \mathrm{O}_8$ is

1 $\frac{16}{3}$
2 $\frac{4}{3}$
3 $\frac{3}{4}$
4 $\frac{5}{2}$
5 $\frac{8}{3}$
Kerala CEE -03.07.2022
Classification of Elements and Periodicity in Properties

89318 Which oxidation state for nitrogen is correctly given ?
Compound
Oxidation

1 $\mathrm{NH}_3$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \quad+1$
3 $\mathrm{Mg}_3 \mathrm{~N}_2-3$
4 $\mathrm{NH}_2 \mathrm{OH} \quad+1$
BCECE-2016
Classification of Elements and Periodicity in Properties

89306 Given below are statements:
Statement I : The pentavalent oxide of group -15 element, $\mathrm{E}_2 \mathrm{O}_5$, is less acidic than trivalent oxide, $\mathrm{E}_2 \mathrm{O}_3$ of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, $\mathrm{E}_2 \mathrm{O}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the options given below:

1 Both Statement I and Statement II are true
2 Both Statement I and Statement II are false
3 Statement I. true, but Statement II is false
4 Statement I. false, but Statement II is true
Shift-I
Classification of Elements and Periodicity in Properties

89308 In which of the following compounds an element exhibits two different oxidation states?

1 $\mathrm{N}_2 \mathrm{H}_4$
2 $\mathrm{N}_3 \mathrm{H}$
3 $\mathrm{NH}_2 \mathrm{CONH}_2$
4 $\mathrm{NH}_4 \mathrm{NO}_3$
Shift-II