Which of the following is an example of an enzyme catalyst?
A. All of the above
B. Amylase
C. Catalase
D. Zymase
Answer: Option A
Solution (By JKExamLibrary)
Zymase (in yeast) converts sugars to ethanol, catalase (in liver) breaks down hydrogen peroxide, and amylase (in saliva) breaks down starch into sugars. All are biological enzymes that act as highly specific catalysts in biochemical reactions, functioning under mild conditions of temperature and pH.
Explanation:
Baking soda (NaHCO₃) is an anhydrous salt and does not contain water of crystallization. Blue vitriol (CuSO₄·5H₂O), washing soda (Na₂CO₃·10H₂O), and gypsum (CaSO₄·2H₂O) all contain fixed water molecules integrated into their crystal lattice, which gives them their specific shape and color.
Explanation:
The diagonal relationship occurs when elements in the second period resemble elements in the third period of the next group due to similar ionic sizes and charge-to-radius ratios (polarizing power). Li-Mg, Be-Al, and B-Si are all classic examples of this phenomenon.
Explanation:
Zn + H₂SO₄ → ZnSO₄ + H₂↑. Hydrogen gas is released, which burns with a pop sound. This is a test for hydrogen. Metals above hydrogen in reactivity series displace it from acids. Dilute H₂SO₄ with Zn produces H₂; with Cu, no reaction.
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