B. The amount of heat produced by complete combustion of 1 kg of fuel.
C. The amount of oxygen required for combustion.
D. The temperature at which the fuel catches fire.
Answer: Option B
Solution (By JKSSB Mock Tests)
Calorific value is the amount of heat energy produced on the complete combustion of 1 kg (or 1 m³ for gases) of a fuel. It is expressed in kJ/kg or kJ/m³. Hydrogen has the highest calorific value among common fuels, making it a highly efficient energy source.
Explanation:
Aluminium oxide (Al₂O₃) reacts with both acids and bases, so it is amphoteric. Na₂O and MgO are basic; CuO is basic. ZnO is also amphoteric.
Explanation:
A separating funnel allows immiscible liquids to form layers; the denser liquid is drained from the bottom. Fractionating column is for miscible liquids with close boiling points, condenser for distillation, centrifuge for separating fine solids or liquids of different densities by spinning.
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