Select the most appropriate options out of the given choices for the questions. 1. When 2 ml of sodium hydroxide is added to an excess of granular zinc in a beaker, the reaction th... Select the most appropriate options out of the given choices for the questions. 1. When 2 ml of sodium hydroxide is added to an excess of granular zinc in a beaker, the reaction that occurs can be written in the form of: (A) NaOH + Zn → NaZnO2 + H2 (B) 2NaOH + Zn → Na2ZnO2 + H2 (C) 2NaOH + Zn → NaZnO2 + H2 (D) 2NaOH + Zn + H2O → Na2ZnO2 + H2. 2. Select from the following decomposition reactions in which source of energy for decomposition is light: (A) 2FeSO4 → 2FeO + SO2 + SO3 (B) 2H2O2 → 2H2O + O2 (C) CaCO3 → CaO + CO2 (D) 2NaOH + Zn → NaZnO2 + H2. 3. A metal and a non-metal that exists in liquid state at room temperature are respectively: (A) Bromine and Mercury (B) Mercury and Iodine (C) Mercury and Bromine (D) Iodine and Mercury. 4. Carbon compounds: (A) are good conductors of electricity. (B) are bad conductors of electricity. (C) have strong forces of attraction between their molecules. Read more

Understand the Problem

The question encompasses various chemistry-related queries, asking for specific selections and explanations pertaining to chemical reactions, elements, and compounds. It requires knowledge of chemistry concepts, particularly focusing on reactions, elements' states, and conductivity properties of carbon compounds.

More Information

Zinc reacts with sodium hydroxide to form sodium zincate and hydrogen. Decomposition of hydrogen peroxide involves light energy. Mercury and bromine are unique as they are liquid at room temperature. Carbon compounds don't conduct electricity well due to their molecular structure.

Tips

Ensure balanced reaction equations. Understand physical states and properties of elements. Distinguish types of decomposition reactions.

Sources

• Sodium hydroxide and zinc reaction - BYJU'S - byjus.com
• Properties of mercury and bromine - Encyclopedia Britannica - britannica.com