Transition elements - configuration, occurrence and characteristics — practice questions

Question 1 · difficulty L2 · understanding

Niobium $(\mathrm{Nb})$ and ruthenium $(\mathrm{Ru})$ have " $x$ " and " $y$ " number of electrons in their respective 4 d orbitals. The value of $x+y$ is __________.

Question 2 · difficulty L2 · understanding

In Chromyl chloride, the oxidation state of chromium is $(+)$ _______________.

Question 3 · difficulty L2 · understanding

The total change in the oxidation state of manganese involved in the reaction of $\mathrm{KMnO}_{4}$ and potassium iodide in the acidic medium is ____________.

Question 4 · difficulty L2 · understanding

The value of magnetic quantum number of the outermost electron of Zn + ion is ______________.

Question 5 · difficulty L2 · understanding

Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________

Question 6 · difficulty L2 · understanding

In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ____________ $$\times$$ 10 $$-$$1 BM. (Round off to the Nearest Integer). [Given : $$\sqrt 3$$ = 1.73, $$\sqrt 2$$ = 1.41 ]

Question 7 · difficulty L2 · understanding

Among PbS, CuS, HgS, MnS, Ag 2 S, NiS, CoS, Bi 2 S 3 and SnS 2 the total number of black coloured sulphides is

Question 8 · difficulty L2 · understanding

Which of the following is NOT a physical or chemical characteristics of interstitial compounds?

• A. They have high melting points, higher than those of pure metals.
• B. They are very soft and ionic in nature.
• C. They retain metallic conductivity.
• D. They are chemically inert and usually non-stoichiometric.

Question 9 · difficulty L2 · understanding

Pair of transition metal ions having the same number of unpaired electrons is

• A. $\mathrm{Ti}^{3+}, \mathrm{Mn}^{2+}$
• B. $\mathrm{Ti}^{2+}, \mathrm{Co}^{2+}$
• C. $\mathrm{Fe}^{3+}, \mathrm{Cr}^{2+}$
• D. $\mathrm{V}^{2+}, \mathrm{Co}^{2+}$

Question 10 · difficulty L2 · understanding

The amphoteric oxide among $\mathrm{V}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4$ and $\mathrm{V}_2 \mathrm{O}_5$, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :

• A. + 4
• B. + 5
• C. + 3
• D. + 7