Chemistry - Study Mode
[#236] The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
Correct Answer
(C) igneous rocks
Explanation
Solution: The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called igneous rocks.
[#237] The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
Correct Answer
(C) Henry's law
Explanation
Solution: In physical chemistry, Henry's law is a gas law that states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. The proportionality factor is called Henry's law constant.
[#238] Carborundum is another name of
Correct Answer
(A) Silicon carbide
Explanation
Solution: Silicon carbide (SiC), also known as carborundum is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.
[#239] German silver is an alloy of
Correct Answer
(C) Zinc, copper and nickel
Explanation
Solution: German Silver is an alloy of copper, zinc and nickel, sometimes also containing lead and tin. It was originally named for its silver-white colour, but the term 'silver' is now prohibited for alloys not containing that metal.
[#240] Which one of the following does not contain Silver ?
Correct Answer
(C) German Silver
Explanation
Solution: German Silver does not contain silver.