All the substance listed below are fertilizers that contribute nitrogen to the soil. Which of these is the richest source of nitrogen on a mass percentage basis ?
(a) Urea
(b) Ammonium Nitrate
(c)Nitric oxide
(d) Ammonia

Answer the following questions based on Meselson and Stahl's experiment of E. coli : (a) Write the name of the chemical substance used as the only source of nitrogen in the experiment. (b) Why did they allow the synthesis of the light and the heavy DNA molecules in the organism ? (c ) How did they distinguish the heavy DNA molecules from the light DNA molecules? Explain. (d) Write the conclusion the scientists arrived at, at the end of the experiment.

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250^@C ?

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. The gas which burns with a green flame and reduces a heated metallic oxide to a metal.

Nitrogen gas can be obtained by heating : A: Ammonium nitrate B: Ammonium nitrte C: Magnesium nitride D: Ammonium chloride

Some of the fertilisers are sodium nitrate NaNO_(3) , ammonium sulphate (NH_(4))_(2)SO_(4) and urea CO(NH_(2))_(2) . Which of these contains the highest percentage of nitrogen ?

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. Two gases which react in the presence of copper catalyst at high temperatures to give an alcohol.

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. A gas which is absorbed by iron[II] sulphate solution to give an addition compound.

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. The gas liberated when the product of reaction of bromoethane & aqueous KOH – reacts with sodium metal.

Which one of the following pair of waste substances is removed from blood in ornithine cycle (a) CO_(2) and urea (b) Ammonia and urea (c) CO_(2) and ammonia (d) Urea and sodium

A gardener has supply of fertilizer A which consists of 10% nitrogen and 6% phosphoric acid and fertilizer B which consists of 5% nitrogen and 10% phosphoric acid. After testing the soil conditions, he finds that he needs at least 14 kg of nitrogen and 14 kg of phosphoric acid for his crop. If fertilizer A costs 10.60 per kg and fertilizer B costs 8.40 per kg, what is the minimum cost at which the farmer can meet the nutrient requirement by using a combination of both types of fertilizers?