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Science · 2025 · 2 marks
CBSE 2025 · Region 4 · Set 1 · Q22
(A) Show the formation of magnesium chloride by electron transfer. Write the name of the cation and anion present in the compound formed. (Atomic…
(A)
Show the formation of magnesium chloride by electron transfer. Write the name of the cation and anion present in the compound formed. (Atomic Number of $\displaystyle \mathrm{Mg}=12, \mathrm{Cl}=17$ )
OR
(B)
How is zinc extracted from its ore? Name the processes involved in the extraction and write chemical equations for the reactions that occur during these processes.
Marking-scheme solution
Cation - magnesium ion / \(\displaystyle \left(\mathrm{Mg}^{2+}\right)\)
Anion - chloride ion / ( \(\displaystyle \mathrm{Cl}^{-}\))
(B)
If Zinc is in the form of sulphide ore.
Roasting
\[2 \mathrm{ZnS}+3 \mathrm{O}_{2} \xrightarrow{\text { Heat }} 2 \mathrm{ZnO}+2 \mathrm{SO}_{2}
\]
Reduction
\[\mathrm{ZnO}+\mathrm{C} \xrightarrow{\text { Heat }} \mathrm{Zn}+\mathrm{CO}
\]
If Zinc is in the form of carbonate ore.
Calcination
\[\mathrm{ZnCO}_{3} \xrightarrow{\text { Heat }} \mathrm{ZnO}+\mathrm{CO}_{2}
\]
Reduction
\[\mathrm{ZnO}+\mathrm{C} \xrightarrow{\text { Heat }} \mathrm{Zn}+\mathrm{CO}
\]
(either i or ii)
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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.