defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series General Science Chemistry Basic Concepts of Chemistry

कैल्शियम हाइड्रॉक्साइड का सही फॉर्मूला ______ है

1
(Ca)OH2
2
Ca(O)H2
3
CaOH2
4
Ca (OH)2
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