Lanthanides Halides & Hydrides

Which general formula is referring to the most stable Lanthanides Halides compound?

General formula of Lanthanides Halides depends on?

• Number of halogens attachment

• Charge of Ln & X atom

• Size of Ln and X atom

• All are correct

Formation of Lanthanides Halides obtained from reaction between Ln metals with X gas. What is the type of reaction for this formation?

• Exothermic Reaction

• Endothermic Reaction

• No

• Yes

Which of the following is the structure for Lanthanides Halides?

• Rock-salt structure

• Hexagonal close-packed(HCP) structure

• Complex crystal structure

• High hydrogen storage capacity

Mining, Beneficiation, Leaching, Purification, Halogenation, Precipitation is the steps for extraction of?

• Lanthanides Hydrides

Which of the following pictures is the correct structure for Lanthanides Hydrides?

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Which of these answers are the uses of Lanthanides Hydrides?

• Catalysts

• Nuclear Absorbers

• Electronic & Magnetic Material

• Glass and ceramics

What is the most common oxidation state of lanthanides?

• +2

• +6

• +4

• +3

Which of the following is not a property of lanthanides?

• They are soft metals with white silvery color

• They tarnish rapidly by air

• The hardness of the metals increases with increase in the atomic number

• The melting point of the metal ranges from 500-1000K