कार्बन के वे दो मुख्य गुण कौन से हैं जो इसकी 'सर्वतोमुखी प्रकृति' (versatile nature) में योगदान करते हैं और इसे बड़ी संख्या में यौगिक बनाने की क्षमता प्रदान करते हैं?

Which allotrope of Carbon is commonly used as a 'solid lubricant'?

Which of the following is considered the purest form of carbon among coal products?

Given below are two statements: Statement I: Denatured alcohol contains small quantity of methanol, a poisonous substance. Statement II: Methanol is poisonous because it gets oxidized to methanoic acid in liver, which coagulates the protoplasm. In the light of the above statements, choose the correct answer from the options given below: