The compound FeS (Iron(II) sulfide) is not attracted by a magnet because iron has lost its magnetic properties (d). During the chemical reaction between iron and sulfur, a new compound forms, where iron atoms are bonded with sulfur, altering its ...
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The metalloid among these is (b) Germanium. Metalloids have properties of both metals and non-metals. Germanium is a semiconductor, meaning it conducts electricity under certain conditions, making it useful in electronics. Sodium and magnesium are metals, while oxygen is a ...
A square matrix is a matrix with an equal number of rows and columns. The order of a square matrix refers to its size, represented as “n x n,” where “n” is the number of rows (or columns). Examples include ...
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
(c) Changes (i), (iii) and (iv) are physical in nature because we can get back to the original form by physical methods. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/