Henri Becquerel discovered radioactivity in 1896 while studying uranium salts. Marie and Pierre Curie further investigated radioactive elements. Rutherford studied alpha/beta radiation.
Assertion (A): Aluminum is highly reactive but is used for making cooking utensils. Reason (R): Aluminum forms a protective layer of aluminum oxide on its surface.
A.Both A and R are true but R is NOT the correct explanation of A.
B.Both A and R are true and R is the correct explanation of A.
Explanation:
Aluminum is a highly reactive metal, yet it is widely used for cookware. This is because it rapidly reacts with atmospheric oxygen to form a thin, tough, and invisible layer of aluminum oxide (Al2O3) on its surface. This passivation layer prevents further corrosion and reaction with food.
Explanation:
The critical temperature (Tc) is the temperature above which a gas cannot be liquefied, regardless of how much pressure is applied. Above Tc, the kinetic energy of the molecules is too high for intermolecular forces to hold them together in a liquid state, even under extreme pressure.
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