there are three substance X,Y and Z , the substance X, does not have a fixed melting point or boiling and it still shows the individual properties of its constituents ,the substance Y has a fixed melting point and boiling but it cannot be broken down into simpler substance by any chemical means the substance Z is also a pure substance divided by electroysis into two substance which belong to the same class of substance 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 group into which all the substance like Y are divided on the basis of their properties .

Answer

(a) Mixture ; salt solution (b) Element ; sulphur ( c) compound ; Water (d) Formation of Z (which is a compound (e ) Metals Non- metals and metalloids