निम्नलिखित में से कौन तत्व – McqOptions

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1.	निम्नलिखित में से कौन तत्व सभी कार्बनिक यौगिकों में मिलता है -
A.	कार्बन
B.	कैल्सियम
C.	नाइट्रोजन
D.	ऑक्सीजन
Answer» B. कैल्सियम

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