Which fertilizer contains the highest percentage of nitrogen?
A. Sodium nitrate
B. DAP
C. Urea
D. Ammonium sulfate
Answer: Option C
Solution (By JKExamLibrary)
Urea (NH₂CONH₂) contains about 46% N. Ammonium sulfate ~21% N, sodium nitrate ~16% N, DAP ~18% N (and 46% P₂O₅). Urea is the most concentrated solid nitrogen fertilizer.
Explanation:
Acidified copper sulfate (CuSO₄) solution is the electrolyte. The iron spoon is the cathode, and a pure copper plate is the anode. Cu²⁺ ions are reduced at the cathode and deposited on the spoon. Fe from spoon does not go into solution because it is cathode.
Explanation:
Sodium has the electronic configuration [Ne]3s1. After losing one electron to form Na+, it achieves a highly stable noble gas configuration ([Ne]). Removing a second electron from this stable core requires an exceptionally large amount of energy. Thus, sodium has the highest second ionization energy among these elements.
Explanation:
CaO is an ionic compound: Ca loses 2 electrons to form Ca²⁺, O gains 2 electrons to form O²⁻. CH₄, CCl₄, NH₃ are covalent molecules where electrons are shared. Electrovalent compounds are formed between metals and non-metals with a large electronegativity difference.
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