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7 marksNon-Metals

CSEC Chemistry · January 2009 · Paper 2 · Question 7(a)(i)

NPK is a common fertilizer containing nitrogen, phosphorus, and potassium, available in various strengths. Labels for three bags (A, B, C) are provided: Bag A (20:8:14), Bag B (14:14:14), Bag C (10:25:15). Scenario 1: Farmer Brown's tomatoes ripened slowly, with thin, fragile roots. Scenario 2: Farmer George's herbs (parsley, chives, thyme) appeared yellow and limp.

Suggest which bag of fertiliser (A, B or C) the farmers should use to solve the problems encountered in Scenario 1 and Scenario 2 above.

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Other parts of this question

  1. 7(a)(ii)Provide a suitable explanation for your selection in EACH case.[1 mark]
  2. 7(b)(i)Write the chemical formula for lime.[1 mark]
  3. 7(b)(ii)What is the effect of lime on the acidity of a soil?[1 mark]
  4. 7(b)(iii)Write a balanced ionic equation to illustrate the action of lime on soil.[2 marks]
  5. 7(b)(iv)A cotton farmer recognizes that his soil needs more nitrogen, and lime, so he adds an ammonium fertiliser and lime to the soil at the same time. Explain how…[4 marks]

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