The compound containing a coordinate covalent bond is: MCQ with Answer and Explanation

Explanation:
Neutralization is the reaction of an acid with a base to produce salt and water. However, the resulting solution is not always neutral (pH 7) because the salt may undergo hydrolysis. If the acid is strong and base weak (e.g., HCl + NH₄OH), the salt (NH₄Cl) is acidic, pH < 7. If acid is weak and base strong (CH₃COOH + NaOH), salt is basic, pH > 7. Only strong acid-strong base gives pH 7.

Explanation:
Silk is a natural protein fiber obtained from silkworm cocoons. Nylon, polyester, acrylic are synthetic polymers derived from petrochemicals.

Explanation:
Half-life (T₁/₂) is the characteristic time for radioactive decay. For first-order kinetics, it is constant.