✓ Board-verified
Science · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 2 · Q27
(a) State giving reason the reduction process to obtain the following metals from their compounds: (i) Mercury, (ii) Copper and (iii) Sodium OR 27.…
(a)
State giving reason the reduction process to obtain the following metals from their compounds :
(i)
Mercury,
(ii)
Copper and
(iii)
Sodium
OR 27. (b) State giving reason for the change in appearance observed when each of the following metal is exposed to atmospheric air for some time :
(i)
Silver,
(ii)
Copper and
(iii)
Iron
Marking-scheme solution
(i) Reduction Process- Roasting Reason- Mercury has low reactivity.
(ii) Reduction Process- Roasting Reason- Copper has low reactivity.
(iii) Reduction Process- Electrolytic Reduction. Reason- Sodium has high reactivity OR
(b)
(i) Change in appearance - White to black colour. Reason- Silver sulphide is formed.
(ii) Change in appearance - Reddish brown to green colour. Reason- Basic Copper Carbonate is formed.
(iii) Change in appearance- Grey to brown colour. Reason- Rust (iron oxide) is formed.
All Metals and Non-metals questions2024 question paperNCERT solutions: Metals and Non-metalsPractice Metals and Non-metals →
More from Metals and Non-metals
- (i) It is observed that covalent compounds are bad conductors of electricity. Give reason. (ii) Carbon can neither form C^4+ cation nor C^4- anion.…2023
- A metal, M, displaces iron from aqueous solution of ferrous sulphate but fails to do so in case of aqueous solution of aluminium sulphate. The metal…2025
- Sodium metal is stored under kerosene oil. Why? Some metal oxides are soluble in water. What are the aqueous solutions of these oxides called? Write…2024
- List two advantages of adopting the atomic number of an element as the basis of classification of elements in the Modern Periodic Table. Write the…2022
- Consider the following organic compounds: (i) (ii) Name the functional group present in their compounds. Write the general formula for the compounds…2022
- Attempt either or: (i) Write one example each of one metal that is so soft that it can be cut with a knife, and one non-metal that is a good…2026
- Cinnabar is an ore of a metal 'X'. When this ore is heated in air, it is first converted into oxide of 'X' (XO) and then reduced to metal 'X' on…2025
- Which of the following is an alloy of copper and tin?2024
CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.