Chemistry - Study Mode
[#541] Which of the following alloy is used in making magnet ?
Correct Answer
(C) Alnico
Explanation
Solution: A magnetic alloy is a combination of various metals from the periodic table that contains at least one of the three main magnetic elements: iron (Fe), nickel (Ni), and cobalt (Co). Such an alloy must contain but is not limited to one or more of these metals. Magnetic alloys have become common, especially in the form of steel (iron and carbon) alnico (iron, nickel, cobalt, and aluminum,) and permalloy (iron and nickel.) The strongest magnetic element is iron, which allows items made out of these alloys to attract to magnets.
[#542] In its reaction with silver nitrate, C 2 H 2 shows
Correct Answer
(D) Acidic property
Explanation
Solution: In its reaction with silver nitrate, acetylene shows acidic property because H atoms are replaced by Silver metal atoms.
[#543] Yellow Cake an item of smuggling across border is
Correct Answer
(C) Uranium oxide
Explanation
Solution: Yellow cake, an item of smuggling across border, is Uranium oxide. Uranium oxide smuggled across border as yellow cake. Enriched uranium can be used in making illegal nuclear explosive that is dangerous to humanity.
[#544] The transuranium elements are the chemical elements with atomic numbers greater than
Correct Answer
(C) 92
Explanation
Solution: The transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92, which is the atomic number of uranium. All of these elements are unstable and decay radioactively into other elements.
[#545] Which of the following elements is non-radioactive ?
Correct Answer
(D) Zirconium
Explanation
Solution: Zirconium is non-radioactive. It is a chemical element with the symbol Zr, atomic number 40 and atomic mass of 91.224. The name of zirconium is taken from the mineral zircon, the most important source of zirconium. It is a lustrous, grey-white, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier, although minor amounts are used as alloying agent for its strong resistance to corrosion.