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Science · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 1 · Q28
(A) Observe the following diagram showing an experiment to determine the conditions under which a metal ' M ' corrodes. List your observations in…
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.
(a)
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.
(a)
\(\displaystyle \mathrm{Al}=2,8,3\)
(b)
Ionic compounds have strong force of attraction between the positive and negative ions /Strong interionic forces of attraction/Strong electrostatic forces of attraction.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.