CBSE 2025 · Region 4 · Set 2 · Q28 · 3 marks
Samples of four metals A, B, C and D were added one by one to the following solutions. The results obtained were tabulated as follows : \backslashbox{Metal}{Solution} Iron Sulphate Copper Sulphate Zinc Sulphate Aluminium Sulphate A - Displacement No reaction No reaction B Displacement Displacement Displacement - C Displacement ? - No reaction D No reaction No reaction No reaction No reaction
Use the table above to answer the following questions about metals $\displaystyle \mathrm{A}, \mathrm{B}$, C and D :(i)Which is the least reactive metal?(ii)What would be observed if C is added to a solution of copper sulphate?(iii)Arrange the metals A, B, C and D in the order of their decreasing reactivity.
Samples of four metals A, B, C and D were added one by one to the following solutions. The results obtained were tabulated as follows :
Use the table above to answer the following questions about metals $\displaystyle \mathrm{A}, \mathrm{B}$, C and D :
| \backslashbox{Metal}{Solution} | Iron Sulphate | Copper Sulphate | Zinc Sulphate | Aluminium Sulphate |
| A | - | Displacement | No reaction | No reaction |
| B | Displacement | Displacement | Displacement | - |
| C | Displacement | ? | - | No reaction |
| D | No reaction | No reaction | No reaction | No reaction |
(i)
Which is the least reactive metal?
(ii)
What would be observed if C is added to a solution of copper sulphate?
(iii)
Arrange the metals A, B, C and D in the order of their decreasing reactivity.
Marking-scheme solution
(i)
Metal D
(ii)
Blue colour of copper sulphate will disappear.
(iii)
\(\displaystyle \mathrm{B}>\mathrm{C}>\mathrm{A}>\mathrm{D}\)
Metals and Non-metalsThe Reactivity SeriesAnalyseshort_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.