Oxidation States of Lanthanides

Q.

Which of the following are the correct stability order for ${\mathrm{N}}_2$ and its given ions?

1. ${\mathrm{N}}_2>{{\mathrm{N}}_2}^{+}={{\mathrm{N}}_2}^{-}>{{\mathrm{N}}_2}^{2-}$

2. ${{\mathrm{N}}_2}^{+}>{{\mathrm{N}}_2}^{-}>{\mathrm{N}}_2>{{\mathrm{N}}_2}^{2-}$

3. ${{\mathrm{N}}_2}^{-}>{{\mathrm{N}}_2}^{-}>{\mathrm{N}}_2>{{\mathrm{N}}_2}^{2-}$

4. ${\mathrm{N}}_2>{{\mathrm{N}}_2}^{+}>{{\mathrm{N}}_2}^{-}>{{\mathrm{N}}_2}^{2-}$

Q.

Which is the strongest oxidizing agent?

Q.

Which of the following oxides shows electrical properties like metals ?

(a) $Si{O}_2$ (b) MgO (c) $S{O}_2\left(\right)s$ (d) $Cr{O}_2$

Q.

Give the iupac names

[Pt(NH3)4][PtCl4]

[Pt(NH3)4Cl2][PtCl4]

Q.

Formula of sodium phosphate is _________.

Q. Name a transition element which does not exhibit variable oxidation states.

Q. In aqueous solution, Eu${}^2+$ ion acts as a/an

1. either a) or b)
2. oxidizing agent
3. reducing agent
4. none of these.

Q.

What is the correct general outer electronic configuration of group 13 elements?

Q. What does the term half life of tritium mean?

Q.

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?

1. A and B

2. B and D

3. A and C

4. D and E

Q. Consider the following statements with respect to lanthanides: 1. The basic strength of hydroxides of lanthanides increases from La(OH)3 to Lu(OH)3. 2. The lanthanide ions Lu+3, Yb+2 and Ce+4 are diamagnetic Which of the statement(s) given above is/are correct? 1 ) 1 only 2 ) 2 only 3 ) Both 1 and 2 4 ) Neither 1 nor 2

Q.

Transition elements are regarded as:

1. Metalloids

2. Non-metals

3. Metals

4. Inert gases

Q.

ASSERTION: Reducing character of hydrides of group 16 elements increases as the atomic number of central atom increases.

REASON: Due to strong force of attraction of H-E bond.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true and R is not the correct explanation of A.

3. A is false but R is true

4. A is true but R is false.

Q. In chromite ore, the oxidation number of iron and chromium are respectively

1. +3, +2
2. +3, +2
3. +2, +6
4. +2, +3.

Q. Assertion: Ionisation enthalpy of group $16$ elements is lower than that of group $15$ elements.
Reason: On moving left to right in a period, effective nuclear charge increases.

1. Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion
2. Both Assertion and Reason are correct and Reason is NOT the correct explanation of the Assertion
3. Assertion is correct and Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

14 Elements after Actinium are called

1. Lanthanides

2. Actinides

3. D-Block Elements

4. P-Block elements

Q.

Name an oxidizing agent.

Q.

Name the $118$ elements?

Q.

What are the different oxidation states exhibited by lanthanoids?

Q.

Which is the least active metal according to the activity series of metals?

Q.

Which of the following has pseudo inert gas configuration?

1. ${\mathrm{K}}^{+}$

2. ${\mathrm{S}}^{2-}$

3. ${\mathrm{Cu}}^{+}$

4. ${\mathrm{Na}}^{+}$

Q.

The element showing most stable +8 oxidation state in its compound is

1. Os

2. Ni

3. Re

4. Ru

Q. Consider the elements $Mg,Al,S,P$ and $Si,$ the correct increasing order of their first ionization enthalpy is :

1. $Mg<Al<Si<P<S$
2. $Mg<Al<Si<S<P$
3. $Al<Mg<S<Si<P$
4. $Al<Mg<Si<S<P$

Q.

The 5 age group element which exhibit wide range of oxidation States is

Q. Which of the following is not a property of a transition metal?

1. They are lustrous
2. They are malleable
3. They are ductile
4. They have low boiling points

Q.

Does hydrogen belong to the P Block elements??? Also, is it a member of alkali earth metals???

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Q. Boron cannot form which of the following anions?

1. $B(OH{)}_4^{-}$
2. $B{O}_2^{-}$
3. $B{F}_6^{3-}$
4. $B{H}_4^{-}$

Q. Lanthanum and actinium are d block elements or f block its confusing a lot because they are taken somewhere in d block and somewhere in f block

Q. Compare Lanthanide and Actinide? (Write any five points).

Q.

Argon is used for welding metals.

1. True
2. False