The allotrope of carbon used in electrodes and as a neutron moderator in nuclear reactors is:
A. Charcoal
B. Diamond
C. Graphite
D. Fullerene
Answer: Option C
Solution (By JKSSB Mock Tests)
Graphite is used in electrodes (due to electrical conductivity) and as a moderator in nuclear reactors (to slow down neutrons). It is chemically stable and can withstand high temperatures. Diamond is an insulator. Fullerene is a nanomaterial. Charcoal is used as adsorbent and fuel. Graphite blocks are used in RBMK reactors (like Chernobyl) and in advanced gas-cooled reactors.
Explanation:
The long non-polar hydrocarbon tail is hydrophobic and dissolves in grease/oil. The ionic head (carboxylate) is hydrophilic and interacts with water. This dual nature enables micelle formation and cleaning.
Explanation:
Flammability describes how a substance reacts with oxygen to burn, which is a chemical change. Boiling point, density, and melting point are physical properties because they can be observed without changing the chemical identity of the substance. Chemical properties are only observed during a chemical reaction.
Explanation:
Vinegar is a 4-8% solution of acetic acid (CH₃COOH) in water. Formic acid is in ant sting, citric in citrus fruits, lactic in curd. Acetic acid is used as preservative and condiment.
No comments yet. Be the first to start the discussion!