Q. 51. Which of the following elements behave chemically, both as a metal and a non-metal?
(A) Argon
(B) Xenon
(C) Carbon
(D) Boron
Answer:
(D) Boron
Explanation:
Boron is a metalloid, meaning it exhibits properties intermediate between, or mixing, those of metals and non-metals.
Q. 52. Faraday’s Law is associated with
(A) Electrolysis
(B) reaction of gases
(C) pressure of gases
(D) Temperature and pressure
Answer:
(A) Electrolysis
Explanation:
Faraday’s laws of electrolysis quantitatively define the relationships between the amount of substance produced at an electrode and the quantity of electricity passed through an electrolyte.
Q. 53. Lime water in the open air turns milky because of
(A) Oxygen
(B) Hydrogen
(C) Carbon dioxide
(D) Nitrogen dioxide
Answer:
(C) Carbon dioxide
Explanation:
Lime water (calcium hydroxide) reacts with carbon dioxide in the air to form a precipitate of calcium carbonate, turning the solution milky.
Q. 54. Soaps are the _____ salts of higher fatty acids
(A) Sodium
(B) Alkali
(C) fibre
(D) Calcium
Answer:
(A) Sodium
Explanation:
Soaps are chemically the sodium or potassium salts of long-chain (higher) fatty acids.
Q. 55. Pyridine is an example of which compound?
(A) Aldehyde
(B) Alkene
(C) Heterocyclic
(D) Ketone
Answer:
(C) Heterocyclic
Explanation:
Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N, where one carbon atom in the ring is replaced by a nitrogen atom.
