The nutrient element essential for root development in plants 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:
Alkenes follow CₙH₂ₙ. C₂H₄ (ethene) fits n=2 giving H=4. C₂H₆ and CH₄ are alkanes (CₙH₂ₙ₊₂); C₃H₈ is propane (alkane). Alkenes contain a carbon-carbon double bond.

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.