There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
(a) What type of substance could X be ? Name one substance like X. (b) What type of substance could Y be ? Name one substance like Y.
(c) What type of substance could Z be ? Name one substance like Z.
(d) Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
(e) Name the three groups into which all the substances like Y are divided on the basis of their properties.
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(a) X could be a mixture.
One substance like X is salt solution.
(b) Y could be an element.
One substance like Y is iron.
(c) Z could be a compound.
One substance like Z is water.
(d) The formation of Z (compound) involves absorption or release of an appreciable amount of energy.
(e) On the basis of their properties, Y (element) is divided into three groups-
(i) Metals.
(ii) Non- metals.
(iii) Metalloids
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