Which of the following is used as an antiseptic and bleaching agent?
A. Ethanol
B. Hydrogen peroxide
C. Acetone
D. Methanol
Answer: Option B
Solution (By JKSSB Mock Tests)
H₂O₂ releases oxygen that kills bacteria (antiseptic) and bleaches colored materials. Ethanol is disinfectant but not strong bleach. Methanol is toxic.
Explanation:
Limestone (CaCO₃) decomposes to CaO, which is a basic flux. It reacts with the acidic impurity silica (SiO₂) to form calcium silicate (CaSiO₃), a fusible slag: CaO + SiO₂ → CaSiO₃. Slag floats on molten iron and is tapped separately. Reduction is done by CO/coke. Flux makes gangue removal easier. Slag is used in cement, road building.
Explanation:
The reactivity series arranges metals from most reactive (K) to least reactive (Au). A metal higher in the series can displace a lower one from its salt solution. The order is based on tendency to lose electrons (form positive ions). More reactive = more electropositive.
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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