Answer:
(a)
Calcium sulphate hemihydrate is the name of this powder.
(1)
(b) Its chemical formula is 
(1)
(c) 
HCl
gas is produced.
When the gas is passed through dry litmus paper, there is
no change in colour because it cannot show acidic properties, as 
ions are not present.
When the gas is passed through moist litmus paper, colour
changes to red as it shows acidic properties. It happens because ions are produced when HCl dissolves
in water. (1)
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