Niranjan Barla’s Chemistry Questions On 19th Feb, 2010, Niranjan
Barla sent these questions: Can u plz answer this ques?? 1. The
wooden shelves on which conc.Sulphuric Acid bottles are kept are
stained black. Why? 2. Dot diag. of ethyne. Conc. Sulphuric acid
has a very strong affinity for water, which is the reason behind
its dehydrating property. It reacts with wood (which is a type
of cellulose) to dehydrate it (remove the molecules of water
from the wood), leaving behind a layer of carbon, which causes
the black stain on the wooden shelves on which it is kept.
[C6H5O10]n ———- 6[C]n + 5[H2O]n Dot diagram of ethyne