In 'Aqua Regia' quiz competition the quiz master asked one of the teams to name the two hardest substances one of which is naturally occurring and the other one is manmade. As none of the teams could give the correct answer. he gave a clue that both thesubstances are used for cutting glass anddrilling rocks and contain one common element. Then one of the teams gave the correctanswers. What could be theright answer ?

In 'Aqua Regia' quiz competition the quiz master asked one of the team

1.	In 'Aqua Regia' quiz competition the quiz master asked one of the teams to name the two hardest substances one of which is naturally occurring and the other one is manmade. As none of the teams could give the correct answer. he gave a clue that both thesubstances are used for cutting glass anddrilling rocks and contain one common element. Then one of the teams gave the correctanswers. What could be theright answer ?
Answer» Solution :DIAMOND and silicon carbide are the two HARDEST substances KNOWN. Since diamond occures naturally one is diamond and the other is silicon carbide as it is OBTAINED by the reaction between carbon and silicon. The common element present in diamond andsilicon cardide is carbon.