Chemistry 12 Chapter 8 Exemplar Solutions the P-and F-Block Elements Part 1

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I. Multiple Choice Questions (Type-I)

Question 1:

Electronic configuration of a transition element in oxidation state is . What is its atomic number?

(i)

(ii)

(iii)

(iv)

Answer: (ii)

Question 2:

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

(i) (II) is more stable

(ii) (II) is less stable

(iii) (I) and (II) are equally stable

(iv) Stability of (I) and (II) depends on nature of copper salts

Answer: (i)

Question 3:

Metallic radii of some transition elements are given below. Which of these elements will have highest density?

(i)

(ii)

(iii)

(iv)

Answer: (iv)

Question 4:

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

(i)

(ii)

(iii)

(iv)

Answer: (ii)

Question 5:

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

(i)

(ii)

(iii)

(iv)

Answer: (i)

Question 6:

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

(i)

(ii)

(iii)

(iv)

Answer: (ii)

Question 7:

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

(i)

(ii)

(iii)

(iv)

Answer: (ii)

Question 8:

Which of the following reactions are disproportionation reactions?

(a)

(b)

(c)

(d)

(i)

(ii)

(iii)

(iv)

Answer: (i)