Which of the following reactions is a neutralization reaction?
A. 2Na + Cl₂ → 2NaCl
B. HCl + NaOH → NaCl + H₂O
C. Fe + CuSO₄ → FeSO₄ + Cu
D. CaCO₃ → CaO + CO₂
Answer: Option B
Solution (By JKExamLibrary)
Neutralization is the reaction of an acid and a base to form salt and water. HCl (acid) + NaOH (base) → NaCl (salt) + H₂O. Option A is combination; C is decomposition; D is displacement.
Consider the following statements: 1. Galvanization involves coating iron with zinc. 2. Sacrificial protection uses a more reactive metal to protect iron. Which is/are correct?
Explanation:
Galvanization is the process of applying a protective zinc coating to iron to prevent rusting. Sacrificial protection (or cathodic protection) involves connecting iron to a more reactive metal (like magnesium or zinc). The more reactive metal oxidizes preferentially, sacrificing itself to protect the iron. Both statements are correct.
Explanation:
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:
Atomic radius decreases across a period due to increasing nuclear charge. Sodium (Na) is the first element in period 3, thus it has the largest atomic radius. Argon (noble gas) has the smallest (though noble gas radii are van der Waals and larger than covalent, but still trend is decreasing). For metals, Na > Mg > Al; non-metals further smaller.
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