The maximum number of electrons that can be associated with the quantum numbers n=3, l=1, m=-1 is: MCQ with Answer and Explanation

Explanation:
A positive catalyst increases reaction rate by lowering activation energy. Decreasing temperature generally slows reactions. Decreasing concentration reduces collision frequency, lowering rate. Larger pieces have less surface area, slower reaction. Other rate-increasing factors: increasing temperature, increasing pressure (for gases), using finely powdered solids, and light for photochemical reactions.

Explanation:
Bohr's model (1913) could accurately predict the line spectrum of hydrogen and hydrogen-like ions (single-electron species like He⁺, Li²⁺) by introducing quantized energy levels and angular momentum. It failed for multi-electron atoms due to electron-electron interactions. The model explained the Balmer series of hydrogen. Modern quantum mechanics with Schrödinger equation replaced it. Bohr also introduced the concept of stationary orbits.

Explanation:
Sodium bicarbonate (NaHCO₃), baking soda, is a mild base that neutralizes excess stomach acid (HCl) providing relief from acidity. Reaction: NaHCO₃ + HCl → NaCl + H₂O + CO₂. It is a component of many antacid formulations. Sodium chloride is table salt, ammonium chloride is not safe, and calcium sulfate is plaster of Paris ingredient. Milk of magnesia (Mg(OH)₂) is also an antacid.