102. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?
103. Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?
105. Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
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