निम्नलिखित में कौन कठोरतम धातु है ? - Which of the following is the hardest metal? - NimnLikhit Me Kaun kathortam Dhatu Hai ? General Science in hindi, Chemistry Loha question answers in hindi pdf Platinum questions in hindi, Know About Sona General Science online test General Science notes in hindi quiz book Tungsten
Toungston is the most hard metal
Google says Tungsten carbide is 4 times stronger than platinum