71. Which one of the following is used as preservative for foodstuff?
72. Consider the following statements.
1. Pyrex glasses have boron oxide as main constituent besides silica.
2. Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock.
3. They are commonly used for reagent bottles, optical component and household cookware.
Which of the statement(s) given above is/are correct?
1. Pyrex glasses have boron oxide as main constituent besides silica.
2. Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock.
3. They are commonly used for reagent bottles, optical component and household cookware.
Which of the statement(s) given above is/are correct?
73. The polymerisation of which of the following is used in manufacturing of polythene in industry?
74. The residue left after extracting juice from sugarbeet and sugarcane is called
75. Which of the following is not a chemical fertiliser?
76. How CNG is a cleaner fuel?
1. It produces oxides of Sulphur and Nitrogen in very smal amounts.
2. It makes environment less polluted.
3. It emits less greenhouse gases.
1. It produces oxides of Sulphur and Nitrogen in very smal amounts.
2. It makes environment less polluted.
3. It emits less greenhouse gases.
77. Consider the following statements.
1. Among the fertilisers used, urea contains maximum percentage of Nitrogen.
2. The mixture of calcium sulphate is known as super phosphate of lime.
3. Potassium magnesium sulphate is called the muriate of potash.
Which of the statements given above are correct?
1. Among the fertilisers used, urea contains maximum percentage of Nitrogen.
2. The mixture of calcium sulphate is known as super phosphate of lime.
3. Potassium magnesium sulphate is called the muriate of potash.
Which of the statements given above are correct?
78. Aspirin is
79. Which of the following fuels has calorific value equal to petrol?
80. Which one of the following is used in the preparation of antiseptic solution?
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