Which of the following is an example of an enzyme catalyst?
A. Catalase
B. All of the above
C. Zymase
D. Amylase
Answer: Option B
Solution (By JKSSB Mock Tests)
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:
J.J. Thomson proposed the 'Plum Pudding' model in 1904 after discovering the electron. He envisioned the atom as a sphere of positive charge with negatively charged electrons embedded within it, like plums in a pudding. This was later disproved by Rutherford's gold foil experiment.
Explanation:
V ∝ T (in Kelvin). Using Celsius gives a linear relationship but not direct proportionality (line does not pass through origin). Absolute zero (0 K = -273.15°C) is the theoretical temperature of zero volume.
Explanation:
Sodium (alkali metal) reacts violently with cold water: 2Na + 2H₂O → 2NaOH + H₂ + heat. Copper and iron do not react with cold water; iron reacts with steam. Zinc also reacts with steam. Reactivity with water increases down Group 1.
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