Explanation:
The salt bridge (often KCl-agar) allows ion migration to maintain electrical neutrality in half-cells, completing the circuit. It prevents direct mixing of electrolytes.
Explanation:
Zn + H₂SO₄ → ZnSO₄ + H₂↑. Hydrogen gas is released, which burns with a pop sound. This is a test for hydrogen. Metals above hydrogen in reactivity series displace it from acids. Dilute H₂SO₄ with Zn produces H₂; with Cu, no reaction.
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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