CBSE 2025 · Region 5 · Set 1 · Q28 · 3 marks
Observe the following diagram showing an experiment to determine the conditions under which a metal ' M ' corrodes.
List your observations in each of the three cases A, B and C with reason, if the metal ' M ' is generally protected against corrosion by the method of galvanisation.(B)Show the formation of Aluminium Nitride (AlN) by the transfer of electrons. [At. no. of $\displaystyle \mathrm{A} l=13$; At. no. of $\displaystyle \mathrm{N}=7$ ](b)"Ionic compounds are solids and are generally brittle and break into pieces when pressure is applied." Give reason to justify the statement.
Observe the following diagram showing an experiment to determine the conditions under which a metal ' M ' corrodes.
List your observations in each of the three cases A, B and C with reason, if the metal ' M ' is generally protected against corrosion by the method of galvanisation.
(B)
Show the formation of Aluminium Nitride (AlN) by the transfer of electrons. [At. no. of $\displaystyle \mathrm{A} l=13$; At. no. of $\displaystyle \mathrm{N}=7$ ]
(b)
"Ionic compounds are solids and are generally brittle and break into pieces when pressure is applied." Give reason to justify the statement.
Marking-scheme solution
A: Metal M will get corroded partly
The part of metal M outside oil will get corroded whereas the part of the metal M inside the oil will not corrode as it cannot react with moist air.
B: Metal M will not undergo corrosion.
It is inside the oil and not exposed to moist air.
C: Metal M will not undergo corrosion as moisture is absent in test tube C.
(B)
\(\displaystyle \mathrm{Al}=2,8,3\)
(b)
Ionic compounds have strong force of attraction between the positive and negative ions /Strong interionic forces of attraction/Strong electrostatic forces of attraction.
Metals and Non-metalsCorrosion and its PreventionAnalyseshort_answermedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.