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NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Inorganic Chemistry: d- and f-Block Elements

151. Which of the following is a characteristic of the first-row transition elements?

a) They have high melting and boiling points.

b) They show only one oxidation state.

c) They do not form complexes.

d) They are not magnetic.

Answer: a) They have high melting and boiling points.

152. Which of the following is the correct electronic configuration for a transition element in the first series?

a) [Ar] 3d⁶ 4s²

b) [Kr] 4d⁶ 5s²

c) [Ne] 3s² 3p⁶ 3d²

d) [Xe] 5d¹⁰ 6s²

Answer: a) [Ar] 3d⁶ 4s²

153. Which of the following transition metals shows a +7 oxidation state?

a) Iron (Fe)

b) Manganese (Mn)

c) Chromium (Cr)

d) Copper (Cu)

Answer: b) Manganese (Mn)

154. Which of the following is a property of transition elements?

a) They generally have low melting points.

b) They form colored compounds.

c) They do not show variable oxidation states.

d) They are not good conductors of electricity.

Answer: b) They form colored compounds.

155. Which of the following transition metals is known for its catalytic activity in the Haber process?

a) Titanium (Ti)

b) Iron (Fe)

c) Manganese (Mn)

d) Copper (Cu)

Answer: b) Iron (Fe)

156. Which of the following is true regarding the magnetic properties of first-row transition elements?

a) They are always diamagnetic.

b) They exhibit only paramagnetism.

c) They show both paramagnetism and ferromagnetism.

d) They exhibit both paramagnetism and diamagnetism.

Answer: c) They show both paramagnetism and ferromagnetism.

157. Which of the following compounds is an example of an interstitial compound?

a) Iron carbide (Fe₃C)

b) Potassium permanganate (KMnO₄)

c) Potassium dichromate (K₂Cr₂O₇)

d) Sodium chloride (NaCl)

Answer: a) Iron carbide (Fe₃C)

158. Which of the following elements forms complexes readily due to its ability to adopt multiple oxidation states?

a) Iron (Fe)

b) Calcium (Ca)

c) Sodium (Na)

d) Magnesium (Mg)

Answer: a) Iron (Fe)

159. What is the color of the solution formed by the complex [Cu(NH₃)₄]²⁺?

a) Green

b) Blue

c) Yellow

d) Red

Answer: b) Blue

160. Which of the following is the oxidation state of chromium in potassium dichromate (K₂Cr₂O₇)?

a) +1

b) +2

c) +3

d) +6

Answer: d) +6

161. Which of the following is the electronic configuration of a lanthanoid element in its ground state?

a) [Xe] 4f¹⁴ 5s²

b) [Kr] 4d¹⁰ 5s²

c) [Ne] 3s² 3p⁶ 3d¹⁰

d) [Ar] 3d⁶ 4s²

Answer: a) [Xe] 4f¹⁴ 5s²

162. What is the result of lanthanoid contraction?

a) Decrease in ionic radii across the lanthanoid series.

b) Increase in atomic mass of lanthanoids.

c) Increase in atomic radius as you move from left to right.

d) Decrease in the number of oxidation states.

Answer: a) Decrease in ionic radii across the lanthanoid series.

163. Which of the following is a characteristic feature of actinoid elements?

a) They are all radioactive.

b) They are found only in trace amounts in nature.

c) They do not exhibit oxidation states higher than +3.

d) They all form ionic bonds exclusively.

Answer: a) They are all radioactive.

164. Which of the following is the electronic configuration of Uranium (U)?

a) [Rn] 5f³ 6d¹ 7s²

b) [Rn] 5f⁶ 6s²

c) [Xe] 4f¹⁴ 5s² 5p⁶

d) [Rn] 5f⁶ 6d² 7s²

Answer: a) [Rn] 5f³ 6d¹ 7s²

165. Which of the following compounds is used as an oxidizing agent in the laboratory?

a) Potassium dichromate (K₂Cr₂O₇)

b) Sodium chloride (NaCl)

c) Iron chloride (FeCl₃)

d) Potassium permanganate (KMnO₄)

Answer: d) Potassium permanganate (KMnO₄)

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NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Inorganic Chemistry: d- and f-Block Elements

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