 
			 
			MCQOPTIONS
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				| 1. | Making biogas from cow-dung is which kind of change? | 
| A. | Irreversible change | 
| B. | Reversible change | 
| C. | Ray-box | 
| D. | Either [a] or [b] | 
| E. | None of these | 
| Answer» B. Reversible change | |