Science Practice Quiz 42

Q1.Why are air inlets provided in gas/kerosene stoves used at home?

A. To prevent the flame from becoming too hot. B. To ensure a sufficiently oxygen-rich flame. C. To allow for the escape of unburnt fuel. D. To regulate the pressure of the fuel supply.

Q2.What does the observation of blackened bottoms of cooking vessels indicate?

A. The fuel is burning with a clean blue flame. B. The air holes are blocked, leading to fuel wastage. C. The cooking vessel is made of poor quality material. D. The flame is too hot, causing carbon deposition.

Q3.What are substances capable of adding oxygen to others known as?

A. Reducing agents B. Catalysts C. Oxidising agents D. Substitution agents

Q4.Which of the following are examples of oxidising agents mentioned in the text?

A. Alkaline sodium chloride or acidified sulfuric acid B. Alkaline potassium permanganate or acidified potassium dichromate C. Neutral calcium carbonate or basic magnesium hydroxide D. Acidic hydrochloric acid or basic sodium hydroxide

Q5.In the context of addition reactions, which catalysts are commonly used to add hydrogen to unsaturated hydrocarbons to give saturated hydrocarbons?

A. Iron or copper B. Platinum or silver C. Palladium or nickel D. Zinc or magnesium

Q6.What is the definition of a catalyst according to the provided text?

A. Substances that are consumed in a reaction to speed it up. B. Substances that change the products of a reaction. C. Substances that cause a reaction to occur or proceed at a different rate without the reaction itself being affected. D. Substances that remove oxygen from other compounds.

Q7.Which catalyst is commonly used in the hydrogenation of vegetable oils?

A. Palladium B. Platinum C. Nickel D. Copper

Q8.How do vegetable oils generally differ from animal fats in terms of their carbon chains?

A. Vegetable oils have short saturated carbon chains, while animal fats have long unsaturated carbon chains. B. Vegetable oils have long unsaturated carbon chains, while animal fats have saturated carbon chains. C. Both vegetable oils and animal fats have long saturated carbon chains. D. Both vegetable oils and animal fats have short unsaturated carbon chains.

Q9.For cooking, which type of oils should be chosen for health?

A. Oils containing saturated fatty acids B. Oils containing unsaturated fatty acids C. Oils with short carbon chains D. Oils that are solid at room temperature

Q10.In the presence of what condition does chlorine react with hydrocarbons in a very fast substitution reaction?

A. High pressure B. Low temperature C. Absence of light D. Sunlight

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Science Practice Quiz 42