Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

15 Questions

1 Views

Superconductors and Oxide Compounds

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the name of the compound that became superconducting in 1986?

Ln2O3

La2-xBaxCuO4 (correct)

Ln4+

La2-xBaxCuO3

Who discovered the superconducting properties of La2-xBaxCuO4?

Curies and Fermi

Bednorz and Müller (correct)

Newton and Galileo

Einstein and Bohr

What is the year in which the oxide superconductors were discovered?

1988

1986 (correct)

1987

1985

What is the reaction that reduces Ln4+ to Ln2O3?

Reduction with H2.O Signup and view all the answers

What is the general formula of the compound that became superconducting in 1986?

La2-xBaxCuO4 Signup and view all the answers

What is the range of coordination numbers observed in Ln3+ complexes?

3-12 Signup and view all the answers

What is the more common type of coordination number in Ln3+ complexes?

Higher coordination numbers Signup and view all the answers

What is the oxidation state of the central metal atom in Ln3+ complexes?

+3 Signup and view all the answers

What type of metal atom is present in Ln3+ complexes?

Lanthanide metal Signup and view all the answers

What is the relationship between coordination number and the central metal atom in Ln3+ complexes?

The coordination number is directly proportional to the size of the central metal atom Signup and view all the answers

What is the temperature at which Nb3Ge exhibits zero resistivity?

30 K Signup and view all the answers

Which of the following lanthanides is NOT used to prepare divalent oxides through reduction of Ln2O3?

La Signup and view all the answers

What is the structural characteristic of the C-type Ln2O3?

LnO6 units, but not octahedral Signup and view all the answers

At what temperature range are the divalent oxides prepared through reduction of Ln2O3?

800-2000 oC Signup and view all the answers

What is the common method for preparing divalent oxides of Nd, Sm, Eu, and Yb?

Reduction of Ln2O3 with the elemental lanthanide Signup and view all the answers