transition elements (2)

Which of the following configurations indicate an ion of a transition element:

• (Kr)5s²4d⁸

• (Kr)5s¹ 4d⁹

• (Kr)5s⁰ 4d⁹

• (Kr)5s¹ 4d⁸

Which of the following oxidation state is not allowed for Ni

• +3

• +4

• +2

• +5

How many unpaired electrons are present in Mn⁷⁺ ?

• 4

• 7

• 0

• 3

The complex ion which has three paired d electrons in the central metal atom is

• [Fe(CN)₆]^3-

• [Co(NH₃)₆]³⁺

• [Ni(H₂O)]⁴⁺

• [MnO₄]^-

Which of the following pairs resist the reactions with variable chemicals such as oxidizing agents as well as bases

• Fe₂O₃ and FeO

• FeO and Mn₂O₃

• Fe₂O₃ and MnO

• Mn₂O₃ and MnO

which of the following dose not react with (KMnO₄) oxidizing agent

• Fe²⁺

• Cr²⁺

• Mn²⁺

• V⁵⁺

Which of the following is true about the oxidation state of transition metals?

• The oxidation state increases with increase in atomic number

• The oxidation state increases with increase in atomic number & reaches a maximum in the middle and then decreases

• The oxidation state decreases with increase in atomic number

• The oxidation state decreases with increase in atomic number, reaches a minimum at the middle and then increases

Which of the following pairs have the same electronic configuration?

• Mn³⁺ ,Fe³⁺

• Mn²⁺ ,Fe³⁺

• Mn²⁺ ,Fe²⁺

• Mn²⁺ ,Fe⁴⁺

the correct symbol of potassium dichromate is

• K₃CrO₄

• K₃Cr₃O₇

• KCrO₇

• K₂Cr₂O₇

the correct symbol of aluminium sulfate is

• AlSO₄

• Al₂SO₄

• Al₂(SO₄ )₃

• Al(SO₄)₃