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Inorganic- (Green PACOP) Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

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Inorganic- (Green PACOP) Questions and Answers | Latest Version | 2025/2026 | Correct & Verified Which of the following is known as the "King of Chemicals"? a. Hydrochloric acid b. Sulfuric acid c. Nitric acid d. Acetic acid Which gas is commonly called "laughing gas"? a. Carbon monoxide b. Nitrous oxide c. Methane d. Ammonia Which halogen is a liquid at room temperature? a. Fluorine b. Bromine 2 c. Iodine d. Chlorine Which element is known as the "lightest metal"? a. Sodium b. Lithium c. Aluminum d. Magnesium Which compound is used as the standard for pH 7 buffer solution? a. Sodium chloride b. Ammonium sulfate c. Potassium dihydrogen phosphate d. Calcium carbonate What is the chief constituent of baking soda? a. Sodium carbonate b. Sodium bicarbonate 3 c. Potassium bicarbonate d. Calcium carbonate Which oxide of nitrogen is also known as "laughing gas"? a. NO b. N2O c. NO2 d. N2O5 Which element is used in the treatment of goiter? a. Fluorine b. Iodine c. Bromine d. Chlorine Which compound is the main component of limestone? a. Sodium carbonate b. Calcium carbonate 4 c. Magnesium carbonate d. Potassium carbonate Which element is the basis of hemoglobin in blood? a. Copper b. Iron c. Zinc d. Manganese Which is the most abundant element in the Earth’s crust? a. Iron b. Aluminum c. Oxygen d. Silicon Which gas is known as "marsh gas"? a. Methane b. Ethane 5 c. Propane d. Butane Which salt is commonly called Glauber’s salt? a. Sodium chloride b. Magnesium sulfate

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Inorganic- (Green PACOP) Questions
and Answers | Latest Version |
2025/2026 | Correct & Verified
Which of the following is known as the "King of Chemicals"?

a. Hydrochloric acid


✔✔ b. Sulfuric acid


c. Nitric acid

d. Acetic acid




Which gas is commonly called "laughing gas"?

a. Carbon monoxide


✔✔ b. Nitrous oxide


c. Methane

d. Ammonia




Which halogen is a liquid at room temperature?

a. Fluorine


✔✔ b. Bromine


1

,c. Iodine

d. Chlorine




Which element is known as the "lightest metal"?

a. Sodium


✔✔ b. Lithium


c. Aluminum

d. Magnesium




Which compound is used as the standard for pH 7 buffer solution?

a. Sodium chloride

b. Ammonium sulfate


✔✔ c. Potassium dihydrogen phosphate


d. Calcium carbonate




What is the chief constituent of baking soda?

a. Sodium carbonate


✔✔ b. Sodium bicarbonate


2

,c. Potassium bicarbonate

d. Calcium carbonate




Which oxide of nitrogen is also known as "laughing gas"?

a. NO


✔✔ b. N₂O


c. NO₂

d. N₂O₅




Which element is used in the treatment of goiter?

a. Fluorine


✔✔ b. Iodine


c. Bromine

d. Chlorine




Which compound is the main component of limestone?

a. Sodium carbonate


✔✔ b. Calcium carbonate


3

, c. Magnesium carbonate

d. Potassium carbonate




Which element is the basis of hemoglobin in blood?

a. Copper


✔✔ b. Iron


c. Zinc

d. Manganese




Which is the most abundant element in the Earth’s crust?

a. Iron

b. Aluminum


✔✔ c. Oxygen


d. Silicon




Which gas is known as "marsh gas"?


✔✔ a. Methane


b. Ethane


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