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Science · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 3 · Q32
A compound which is prepared from gypsum has the property of hardening when water is mixed in right quantity with it: (i) Write common name and the…
A compound which is prepared from gypsum has the property of hardening when water is mixed in right quantity with it :
(i)
Write common name and the chemical name of this compound.
(ii)
Give chemical equation for its preparation.
(iii)
List its two uses.
Marking-scheme solution
(i) Plaster of Paris ; Calcium Sulphate hemihydrate
(ii)
\[\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \xrightarrow{373 \mathrm{~K}} \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}+1 \frac{1}{2} \mathrm{H}_{2} \mathrm{O}
\]
(iii)
Two uses :
Used for making toys
Materials for decoration
Making surfaces smooth
Supporting fractured bones
All Acids, Bases and Salts questions2024 question paperNCERT solutions: Acids, Bases and SaltsPractice Acids, Bases and Salts →
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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.