Which one of the following is not a nitrogenous fertilizer?

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Q: 46 (NDA-II/2008)

Which one of the following is not a nitrogenous fertilizer?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,10,29,10,9,8,12

keywords: 

{'nitrogenous fertilizer': [0, 0, 1, 0], 'cacn2': [0, 0, 1, 0], 'nh4no': [0, 0, 1, 0], 'urea': [5, 1, 4, 10]}

Option 1: Ca(CN)2 contains calcium (Ca) and cyanide (CN), but it does not contain nitrogen. Therefore, it is not a nitrogenous fertilizer.

Option 2: CaCN2 is also known as calcium cyanamide, and it does contain nitrogen. It is classified as a nitrogenous fertilizer.

Option 3: NH4NO3 is the chemical formula for ammonium nitrate. It contains nitrogen and is commonly used as a nitrogenous fertilizer.

Option 4: Urea, with the chemical formula CO(NH2)2, is a nitrogenous fertilizer. It contains a high concentration of nitrogen and is widely used in agriculture.

In summary, option 1 (Ca(CN)2) is not a nitrogenous fertilizer since it does not contain nitrogen. All the other options, option 2 (CaCN2), option 3 (NH4NO3), and option 4 (Urea) are nitrogenous fertilizers as they all contain nitrogen.