Select the correct statements about lanthanoids:

(A). Lanthanoids are good conductors of heat and electricity
(B). Ln oxides are used as phosphors in TV screens
(C). Their Melting points range between 2100 to 2300 K
(D). It is used for the production of alloy steels

Choose the correct answer from the options given below:

(A), (B) and (D) only

The correct answer is Option (1) → (A), (B) and (D) only

Correct statements about lanthanoids are:

• (A) Lanthanoids are good conductors of heat and electricity ✔️
• (B) Lanthanoid oxides are used as phosphors in TV screens ✔️
• (D) Lanthanoids are used in the production of alloy steels ✔️

Statement (C) is incorrect because the melting points of lanthanoids generally lie below 2100 K (mostly in the range ~800–1700 K).