61. Which of the following is not true about manganese?
62. Which of the following mixtures is used to purify Gold?
63. The most commonly used substance in fluorescent tubes are
64. Which of the following is the use of sodium carbonate, which is an alkali?
1. Producing sodium compounds such as borax.
2. To remove permanent hardness of water.
3. Use in glass, soap and paper industries.
1. Producing sodium compounds such as borax.
2. To remove permanent hardness of water.
3. Use in glass, soap and paper industries.
65. Which is used in storage batteries?
66. Acidity can be cured by taking . . . . . . . . by a person.
67. Which one of the following materials contains calcium?
68. What is the colour of precipitates formed when carbon dioxide passes through a solution of calcium hydroxide?
69. Galena is the ore of . . . . . . . .
70. What is the common name for Calcium hydroxide solution?
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