Chemistry
If a crop of wheat replaces 30 kg of nitrogen per hectare of soil, what mass of the fertilizer calcium nitrate would be required to replace the nitrogen of a 5-hectare field ?
(at wt. N = 14, O = 16, Ca = 40)
Related Questions
Write ionic reaction at the electrodes during the electrolysis of :
(i) copper II sulphate solution with copper electrodes,
(ii) acidulated water.
(i) What is the atomicity of chlorine.
(ii) Name the compound formed when the above mentioned gas reacts with iron. Give equation.
(iii) Zinc sulphate reacts with sodium hydroxide first a little then in excess. Write a balanced equation for the two reactions with different conditions.
(i) Oxygen oxidises ethyne to produce 8.4 litres of carbon dioxide at STP. Calculate the volume of ethyne used in this reaction.
2C2H2 + 5O2 ⟶ 4CO2 + 2H2O
(ii) A2B is the empirical formula of a compound which has vapour density 25. If atomic weight of A and B are 10 and 5 respectively. Find it's molecular formula.
(i) Name the metalloid(s) of period 3.
(ii) Define atomic size.
(iii) What would be seen on mixing a solution of calcium chloride with a solution of sodium carbonate? Write an equation also.
(iv) Write an equation for the preparation of a hydroxide of a metal which is
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