Fill in the blank - Researchers from Kolkata based Indian Institute o – McqOptions

MCQOPTIONS

1.	Fill in the blank - Researchers from Kolkata based Indian Institute of Science Education and Research (IISER) have produced cost-effective, metal-free cathodes using ________ for use in solar cells.
A.	Palm leave
B.	Onion peel
C.	Human hair
D.	Sulphuric acid
Answer» D. Sulphuric acid

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