81. Which one of the following pairs is not correctly matched?
82. The charcoal used to decolourise brown sugar solution is
83. Which of the following is not a nitrogenous fertiliser?
84. The chief source for the production of nitrogen eous fertilisers is
85. Refrigerators keep food unspoiled because
86. Nail polish remover contains
87. The most popular fertiliser for foliar application is
88. Baking soda is
89. Select the correct statement
1. Cut glasses are lead glasses.
2. The main raw material for the preparation of soda glass is Na2CO3.
3. Quicklime is CaO.
1. Cut glasses are lead glasses.
2. The main raw material for the preparation of soda glass is Na2CO3.
3. Quicklime is CaO.
90. Consider the following statements.
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is
1. to keep to washing power dry.
2. tomaintain the alkalinity of the powder.
Which of these statements is/are correct?
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is
1. to keep to washing power dry.
2. tomaintain the alkalinity of the powder.
Which of these statements is/are correct?
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