Advertisements
Advertisements
प्रश्न
You have three unlabelled test tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal.
उत्तर
Distinction between ethanol, ethanoic acid and soap solution
- Blue litmus paper turns red when it comes in contact with acid. So, ethanoic acid will turn the blue litmus paper red.
- Red litmus paper turns blue when it comes in contact with base. So, the soap solution will turn the red litmus paper blue.
- When ethanol is reacted with sodium metal, it gives bubbles of hydrogen gas that burns with pop sound.
APPEARS IN
संबंधित प्रश्न
What is meant by a non-renewable source of energy? Give two examples of non-renewable source of energy.
Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO2while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
The natural gas consists mainly of:
(a) methane
(b) ethane
(c) propane
(d) butane
Name the biomass which is still widely used as a source of heat energy in many household of our country.
What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?
Suggest a safe and efficient method for the disposal of biowastes and sewage materials. How is this method advantageous to us?
State whether the following is True or False.
Coal takes millions of years to form.
Describe the four major types of coal.
Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
