(a). What is gypsum? What happens when gypsum is heated to `100^(@)C`(373K)?
(b) Name a sodium compound which is used for making borax and glass.
(c) Name the compound which is used in hospitals for setting fractured bones.
(d) Which is the real bleaching agent present in bleaching powder?

Name the compound of sodium which is used to make borax and glass.

What are antacids ? Name two compounds which are used as antacids ?

compound of calcium is used in hospitals for setting fracture of bones.(i) Write the name and formula of the above compound. (ii) What is dead burnt plaster?

Write the chemical name and formula of gypsum. What happens when gypsum is heated at 373K. Write chemical equation for the reaction.

State what happens when : (a) Gypsum is heated at 373 K (b) Blue crystals of copper sulphate are heated (c ) Excess of CO_(2) is passed through lime water.

What is common name of the compound CaOCl_2? Name the substance which reacts with chlorine to produce bleaching powder?

a) Which is the main ore of iron? b) Which compound acts as the reducing agent in the production of iron c) Name the furnace which is used for the industrial preparation of iron.

(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.