What happens when an iron spoon is dipped into acidified copper sulphate solution?
WBBSE
Class X
Physical Science
Electrolysis
01 Mark
2025
When an iron spoon is dipped into acidified copper sulphate solution, a displacement reaction occurs. The blue colour of copper sulphate solution gradually fades and turns green. A reddish-brown layer of copper metal deposits on the iron spoon.
Related Questions
More WBBSE Moderate level questions
1/12
Q.
Which gas is produced at the cathode during electrolysis of acidified water?
A.
Hydrogen. Explanation: In electrolysis of acidified water with Pt electrodes, H⁺ ions...
Q.
State True or False: Electrolysis always involves the process of oxidation-reduction.
A.
True. Explanation: Electrolysis drives chemical reactions using electrical energy, involving oxidation at...
Q.
Which acid is a weak electrolyte? (a) CH₃COOH (b) H₂SO₄ (c) HNO₃ (d) HCl
A.
(a) CH₃COOH Explanation: Electrolytes are classified as strong or weak based on...
Q.
State the resistance of 220 V – 100 W bulb
A.
Power (P) = Resistance (R) = = = = 484 Ω
Q.
For which value of the angle of incidence in refraction of light is Snell’s law...
A.
Snell’s law is not applicable when the angle of incidence is 0°.
Q.
Write whether the following statement is true or false: If coefficient of linear expansion of...
A.
True Explanation: Coefficient of cubical expansion γ = 3 × coefficient of...
Q.
What is the number of molecules present in 16 g of O₂ at S.T.P.?
A.
3.011 × 10²³ Explanation: Given mass = 16 g Molecular mass =...
Q.
Write whether the following statement is true or false: According to Charles’ law, at (–)...
A.
False Explanation: Charles' law states volume becomes zero at absolute zero (-273°C),...
Q.
Write the name of monomer of a polymer which is used to prepare non-stick utensils.
A.
Tetra fluoro ethylene Explanation: Polytetrafluoroethylene (PTFE or Teflon) is used for non-stick...
Q.
Write down the IUPAC name of the following organic compound
A.
2-Bromopropane or (1) CH₃–CH₂–CH₂–OH → Propane-1-ol(2) CH₃–CH(OH)–CH₃ → Propane-2-ol
Q.
Name the metal which is extracted in thermite process.
A.
Fe Explanation: Thermite process reduces metal oxides using Al at high temperature...
Q.
Fill up the blank: CaC₂ + N₂ → ____ + C
A.
CaNCN / CaCN₂ (Calcium cyanamide) Explanation: Haber's process uses Fe as catalyst...