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  1. Which one of the following is used as a fertilizer ?
    1. NH4OH
    2. NH4CI
    3. NH4NO3
    4. (NH4)2SO4
Correct Option: D

(NH4)2SO4 is known as Sindri fertilizer. It is colourless and highly soluble in water. NH4NO3 is also used as a fertilizer by mixing with other substances like nitro chalk NH4NO3 + Ca4CO3, Luena saltpetre NH4NO3 + (NH4)2SO4



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