railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Chemical Formula

खालीलपैकी कोणते 'प्लास्टर ऑफ पॅरिस' म्हणून ओळखले जाते?

1
2CaSO4⋅2H2O
2
2MgSO4⋅H2​O
3
2MgSO4⋅7H2​O
4
CaSO4⋅1/2H2O
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