Enzymes are biological catalysts. Which statement about them is correct?
A. They are inorganic compounds.
B. They are consumed during the reaction.
C. They are highly specific in their action.
D. They work optimally at very high temperatures.
Answer: Option C
Solution (By JKExamLibrary)
Enzymes are proteins that act as catalysts, exhibiting high specificity for substrates (lock-and-key model). They are not consumed, denature at high temperatures, and are organic. Examples: amylase for starch, pepsin for proteins.
Explanation:
Soap (sodium carboxylate) reacts with Ca²⁺ and Mg²⁺ ions present in hard water to form an insoluble precipitate known as scum. This reduces lathering and wastage of soap. Synthetic detergents do not form scum because their calcium/magnesium salts are soluble.
Explanation:
In electrolytic refining of copper, the electrolyte is acidified copper sulfate solution (CuSO₄ acidified with H₂SO₄). The anode is impure copper, cathode is pure copper. Cu²⁺ ions from the electrolyte are reduced and deposited on the cathode, while copper from anode oxidizes and enters solution. Impurities settle as anode mud (containing Ag, Au).
Explanation:
The element with atomic number 118 is Oganesson (Og). It is a synthetic element and a member of the noble gas group (Group 18). Ununennium is the temporary name for element 119, Tennessine is 117, and Nihonium is 113.
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