Question : Which of the following is odourless, tasteless, and non-toxic and is made up of 93.05% methane, nitrogen, carbon dioxide, propane, and traces of ethane?

Question : Heating ethanol with excess concentrated sulphuric acid produces:

Question : The gas that causes suffocation and death when coal or coke is burnt in a closed room is

Question : A mixture contains alcohol and water in the ratio 4 : 3. If 5 litres of water is added to the mixture, the ratio becomes 4 : 5. The quantity of alcohol in the given mixture is:

Question : One litre of milk costs INR 40. Water is mixed with milk and the mixture cost becomes INR 30 per litre. Find the ratio of water and milk in the mixture.