Which of the following compounds contains a coordinate covalent bond?
A. H₂O
B. Cl₂
C. NaCl
D. NH₄⁺
Answer: Option D
Solution (By JKExamLibrary)
In the ammonium ion (NH₄⁺), the nitrogen atom in ammonia (NH₃) shares its lone pair of electrons with a hydrogen ion (H⁺) which has no electrons. This type of bond, where both shared electrons are donated by a single atom, is a coordinate covalent (dative) bond.
Explanation:
Salt (NaCl) dissolved in water increases the electrical conductivity of the electrolyte, facilitating the electrochemical corrosion process. This is why iron rusts faster in coastal areas and on roads treated with deicing salts. Dry air prevents rusting (needs moisture). Coating with paint blocks oxygen and moisture. Vacuum has no oxygen.
Explanation:
Silver bromide decomposes into silver and bromine on exposure to light. This is a photochemical decomposition reaction, where a single compound breaks down into two or more simpler substances. It is also a redox reaction (Ag⁺ reduced, Br⁻ oxidized). Photographic films use this property. Combination would be A + B → AB. Displacement is A + BC → AC + B. Neutralization is acid + base → salt + water.
Explanation:
Methane (CH₄) is released from enteric fermentation in livestock (cattle) and from anaerobic decomposition in flooded rice paddies. It has a high global warming potential (25× CO₂ over 100 years). CO₂ mainly from fossil fuels. N₂O from fertilizers. CFCs from refrigerants. Agriculture contributes significantly to anthropogenic GHG emissions. Reducing methane can have rapid climate benefits.
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