What is dead burnt plaster?
(N/A) Above $393 \ K$,no water of crystallization is left and anhydrous calcium sulphate,$CaSO_{4}$,is formed. This is known as 'dead burnt plaster'.
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Assertion : Of the various chlorides of alkaline earth metals $BeCl_2$ is covalent in nature,whereas $MgCl_2$ and $CaCl_2$ are ionic compounds.
Reason : $Be$ is the first member of group $2$.
Reason : $Be$ is the first member of group $2$.
DifficultAIIMS 2012
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