[" (a) Name one property shoun ly anmonican "],[" choride lever not by sodiom caloride."]

(a) Explain why there is no rise in temperature of a substance when it undergoes a change of state although it is still being heated. (b) Name one property which is shown by naphthalene and not by sodium chloride.

Name one property which is not periodic.

Name one property which is not periodic.

Name one property which is characteristic of (a) metals, and (b) non-metals.

Name one property of waves that do not change when the wave passes from one medium to another.

(a). Give the names and formulae of one metal chloride and one non-metal chloride. (b). State an important property in which these metal chloride and non-metal chloride differ (c). Why do they differ in this property?

(a) Name a sodium compound used for softening hard water. (b) Which compound of calcium is used for disinfecting drinking water supply? (c) Name a metal compound which has detergent properties (cleansing properties). (d) Name one compound of calcium which is used for removing the colour of a coloured cloth. (e) State a peculiar (or remarkable) property of plaster of paris. (f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.

Name the constituents of the following alloys : (i) Brass (ii) Stainless steel (iii) Bronze, State one property in each of these alloys, which is different from its main constituents.

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How many valence electrons are present in each one of them?