III. LiCl and MgCl2 form hydrates like LiCl.8H2O and MgCl2.2H2O
IV. NaHCO3 used as fire extinguisher
A
I, II, III correct
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B
I, II, IV correct
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C
Only III correct
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D
All are correct
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Solution
The correct option is B I, II, IV correct Options I, II and IV are all very accurate. These are all characteristics of the corresponding compounds. As for option III - the compounds LiCl and MgCl2 both form hydrates. Only - LiCl forms LiCl.2H2O whereas MgCl2 forms MgCl2.8H2O