MCQ on D and F Block Elements
1. The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are:
(a) 4, 4 and 2
(b) 3, 3 and 2
(c) 4, 3 and 2
(d) 3, 3 and 3
Answer:::: (c)
2. Gun metal is an alloy of:
(a) Cu and Al
(b) Cu and Sn
(c) Cu, Zn and Sn
(d) Cu, Zn and Ni
Answer:::: (c)
3. Which one of the following elements shows the maximum number of different oxidation states in its compounds?
(a) Eu
(b) La
(c) Cd
(d) Am
Answer:::: (d)
4. When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is
(a) sulphur dioxide
(b) ammonia
(c) carbon monoxide
(d) carbon dioxide
Answer:::: (c)
5. Zinc and mercury do not show variable valency like d-block elements because
(a) they are soft
(b) their d-shells are complete
(c) they have only two electrons in the outermost subshell.
(d) their d-shells are incomplete
Answer:::: (b)
6. Which of the following products are obtained when Na2CO3 is added to a solution of copper sulphate?
(a) Basic copper carbonate , sodium sulphate and CO2
(b) Copper hydroxide, sodium sulphate and CO2
(c) Copper carbonate, sodium sulphate and CO2
(d) Copper carbonate and sodium sulphate
Answer:::: (d)
7. The pair that has similar atomic radii is
(a) Mn and Re
(b) Ti and Hf
(c) Sc and Ni
(d) Mo and W
Answer:::: (d)
8. Silver nitrate produces a black stain on the skin due to
(a) being a strong reducing agent
(b) its corrosive action
(c) formation of complex compound
(d) its reduction to metallic silver
Answer:::: (d)
9. According to IUPAC nomenclature sodium nitroprusside dihydrate is named as
(a) Sodium pentacyanonitrosylferrate (III)
(b) Sodium nitroferrocyanide
(c) Sodium nitroferricyanide
(d) Sodium pentacyanonitrosylferrate (II)
Answer:::: (a)
10. In Fe(CO)5, the Fe-C bond possesses:
(a) ionic character
(b) sigma character only
(c) pi character
(d) both sigma and pi characters
Answer: (d)
