Chemistry-Objective Related Question Answers
926. What is obtained when gypsum is heated to 125°C?
Plaster of paris
927. The suspension of calcium hydroxide in water is called?
Milk of lime or slaked lime
928. Name the calcium compound which is used as filler in paper industry?
Gypsum
929. Which calcium compound is used to make toothpaste?
Calcium carbonate
930. When sodium burns; what is the colour of the flame?
Golden yellow
931. Which sodium compound is used in fire extinguisher?
Sodium bicarbonate
932. Which is the smallest atom among the halogens?
Fluorine
933. The iodine compound used for dressing of wounds?
Iodoform (CHl3)
934. What is the commercial name of sodium nitrate?
Chile salt petre
935. Name a substance which is used as mordant?
Alum
936. What is the chemical name of Emerald?
Beryllium aluminium sillicate
937. Which is the artificial form of aluminium oxide used for making refractory crucibles?
Alundum
938. Which form of aluminium oxide is hard as diamond?
Corundum
939. What is the colour of copper sulphate?
Blue
940. What is the chemical name of verdigris?
Basic copper carbonate or basic copper acetate
941. The copper compound used for preserving timber and hides is?
Copper sulphate
942. Which chemical is used for rat poison?
Zinc phosphide
943. What is the chemical name for marble?
Calcium carbonate
944. Which salt is used in making ink?
Ferrous sulphate
945. Which chemical is used in a refrigerator for cooling purposes?
Freon
946. What is the chemical name for blue vitriol?
Copper sulphate
947. What is the chemical name of calamine?
Zinc carbonate
948. Which chemical is used by weavers for moisturing thread?
Anhydrous calcium chloride
949. What is the chemical name of baking soda?
Sodium bicarbonate
950. What is an Epsom salt?
Magnesium sulphate
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