It is enough to add a few ml of a buffer solution to maintain its pH. Which property of buffer is used here?

Write properties of buffer solution

Which of the following is a buffer solution ?

Which of the following will produce a buffer solution when mixed in equal volumes?

Use your brain power. In earlier class, you had prepared the solution of dry yeast for observation of yeast. Which substance is prepared by its use on commerical basis ?

Read the following paragraph and answer the questions based on it. Rhizobium produce nitrogenous compounds from atmospheric nitrogen. However, for this process of nitrogen fixation, they need leguminous plants like beans, sweet pea, soyabean, etc. as ‘host’. Rhizobium living in root nodules supply nitrates, nitrites and amino acids to that plant and in exchange get energy in the form of carbohydrates from it. Such a mutually beneficial relationship is called symbiosis. Beans and pulses are rich in proteins due to the nitrogenous compounds made available by Rhizobium. After harvesting a leguminous crop, the left-over roots and other plant parts are deliberately dumped in farm soil to maintain its bacterial population. The use of Rhizobium has helped to reduce the use of chemical fertilizers and thereby their adverse effects. It has also helped to reduce expenses on fertilizers and thus works to the benefit of farmers. Which plants act as a host to Rhizobium bacteria?

Calculate the pH of buffer solution containing 0.05mol NaF per litre and 0.015 mol HF per litre. [K_a = 7.2 xx 10^(-4) for HF] .

Apparatus: Test tube, glass rod, beaker, Bunsen burner, etc. Chemicals: Hydrochloric acid, ammonia solution, magnesium strip, quick lime, etc. Activity 3: Take water in a beaker up to half of its capacity. Add a few pieces of quick lime (calcium oxide, CaO) to it. What will you observe?