Chemical Reactions — Set 2
Chemistry · रासायनिक अभिक्रियाएं · Questions 11–20 of 40
Which catalyst is traditionally used in the hydrogenation of vegetable oils?
Correct Answer: D. Nickel
• **Nickel** = Nickel serves as a catalyst to speed up the addition of hydrogen to unsaturated fats. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Iron; B: Zinc; C: Copper
A substance that increases the rate of a chemical reaction without being consumed is a?
Correct Answer: B. Catalyst
• **Catalyst** = A catalyst lowers the activation energy required for a reaction to proceed. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Reactant; C: Inhibitor; D: Product
What is the insoluble solid formed during a chemical reaction called?
Correct Answer: C. Precipitate
• **Precipitate** = A precipitate is an insoluble solid that emerges from a liquid solution during a reaction. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Solvent; B: Solute; D: Filtrate
Which gas is used in the storage of fat-containing food items for a long time?
Correct Answer: D. Nitrogen
• **Nitrogen** = Nitrogen is an inert gas that prevents the oxidation of fats and oils. • **oxidation** — Nitrogen is an inert gas that prevents the oxidation of fats and oils • 💡 Wrong-option analysis: A: Chlorine; B: Oxygen; C: Sulfur dioxide
The reaction $CaO + H_2O \rightarrow Ca(OH)_2$ is an example of?
Correct Answer: C. Combination reaction
• **Combination reaction** = Quicklime reacts vigorously with water to produce slaked lime in a combination reaction. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Thermal decomposition; B: Displacement reaction; D: Electrolysis
Which of the following describes the electrolysis of water?
Correct Answer: D. Decomposition reaction
• **Decomposition reaction** = Electrolysis uses electricity to break down water into hydrogen and oxygen gases. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Combination reaction; B: Neutralization; C: Displacement reaction
What happens during a thermal decomposition reaction?
Correct Answer: C. Heat is absorbed
• **Heat is absorbed** = Thermal decomposition requires the input of heat to break down a compound. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Heat is released; B: Electricity is generated; D: Light is produced
In the reaction $CuO + H_2 \rightarrow Cu + H_2O$, which substance is oxidized?
Correct Answer: A. Hydrogen
• **Hydrogen** = Hydrogen is oxidized because it gains an oxygen atom to become water. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Copper; C: Water; D: Copper oxide
Which of the following is required for the process of photosynthesis?
Correct Answer: B. Carbon dioxide
• **Carbon dioxide** = Plants take in carbon dioxide from the atmosphere to synthesize glucose. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Oxygen; C: Nitrogen; D: Hydrogen
What is the chemical name of the rust formed on iron surfaces?
Correct Answer: A. Hydrated ferric oxide
• **Hydrated ferric oxide** = The correct answer is 'Hydrated ferric oxide'. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Ferric chloride; C: Ferrous oxide; D: Ferrous sulfate