Bleaching powder is produced by the action of chlorine on: MCQ with Answer and Explanation

Question
Bleaching powder is produced by the action of chlorine on:
A. Quicklime
B. Gypsum
C. Limestone
D. Slaked lime
Answer: Option D
Solution (By JKSSB Mock Tests)
Bleaching powder is calcium oxychloride, CaOCl₂, made by passing chlorine gas over dry slaked lime (Ca(OH)₂): Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O. Quicklime is CaO, limestone is CaCO₃, gypsum is CaSO₄·2H₂O. Bleaching powder is used for bleaching cotton and paper, disinfecting water, and as an oxidizing agent. It releases chlorine on exposure to air or acids.
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Question #1
Galvanization is the process of coating iron with a thin layer of:
A. Copper
B. Tin
C. Silver
D. Zinc
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Correct Answer: Option D

Explanation:
Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting. Zinc acts as a sacrificial anode, meaning it will oxidize preferentially to iron, protecting it even if the coating is scratched and the underlying iron is exposed to moisture.
This question belongs to: Science chemistry
Question #2
The alloy brass is composed of:
A. Copper and tin
B. Copper and zinc
C. Iron and chromium
D. Aluminium and magnesium
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Correct Answer: Option B

Explanation:
Brass: Cu + Zn. Bronze: Cu + Sn. Stainless steel: Fe + Cr + Ni. Duralumin: Al + Cu + Mg. Brass is used for musical instruments and utensils.
This question belongs to: Science chemistry
Question #3
The calorific value of a fuel is expressed in:
A. atm
B. °C
C. kJ/kg or J/g
D. mol/L
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Correct Answer: Option C

Explanation:
Calorific value is the energy released per unit mass or volume of fuel. Common units: kJ/kg, kJ/g, J/g, kcal/kg, Btu/lb. It measures fuel efficiency. Hydrogen has about 141.9 MJ/kg (higher), petrol ~47 MJ/kg. Temperature (°C) is not a unit for calorific value. Pressure and concentration are not appropriate.
This question belongs to: Science chemistry
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