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Class 12 Chemistry - Chapter 8: The d-and f-Block Elements MCQ Questions

35 Questions 70 Minutes
Answered: 0 / 35Unanswered: 35

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Question 1

Misch metal is an alloy of

Question 2

Which one is coloured?

Question 3

Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?

Question 4

On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.

Question 5

Which of the following statements is not correct?

Question 6

Which of these elements will have highest density?

Question 7

Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?

Question 8

Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?

Question 9

Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4

Question 10

The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+ ion is

Question 11

When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because

Question 12

Which of the following titanium compounds cannot be prepared? (Atomic No. of Ti = 22)

Question 13

Which of the following is the correct electronic configuration of gadolinium?

Question 14

Increasing order of paramagnetism is

Question 15

KMnO4 acts as an oxidising agent in acidic medium. The number of moles of KMnO4 that will be needed to react with one mole of sulphide ions in acidic solution is

Question 16

Copper sulphate dissolves in excess of KCN to give:

Question 17

The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.

Question 18

Electronic configuration of Cr (Z = 24) is

Question 19

Electronic configuration of Fez+ ion is

Question 20

Which of the following is not a lanthanoid element?

Question 21

Why is HCI not used to make the medium acidic in oxidation reactions of KMnO4 in acidic medium?

Question 22

Maximum oxidation number of manganese is in

Question 23

Which of the following is not an actinoid?

Question 24

Highest oxidation state of manganese in fluoride is +4 (MnF4) but highest oxidation state in oxides is +7 (Mn2O7) because

Question 25

There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

Question 26

Which of the following would be diamagnetic?

Question 27

Which transition metal can show highest oxidation state?

Question 28

Which is colourless in H2O?

Question 29

(iv) 2MnO4– + 3Mn2+ + 2H2O → 5MnO2 + 4H+

Question 30

The electronic configuration of Cu (II) is 3d9 whereas that of Cu (I) is 3d10. Which of the following is correct?

Question 31

Maximum magnetic moment is shown by

Question 32

Which of the following oxidation state is common for all lanthanoids?

Question 33

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because

Question 34

When alkaline KMnO4 is treated with Kl, iodide ion is oxidised to

Question 35

When acidified K2Cr2O7 solution is added to Sn2+ salts then Sn2+ changes to

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