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No of compounds producing gas on hydroly...

No of compounds producing gas on hydrolysis (with `H_(2)O` ) is
`Al_(4)C_(3),BaC_(2),Mg_(2)C_(3),SiC,B_(2)H_(6),Fe_(3)C`

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cetylene gives Tollen's test but not form silver mirror `(Ag).(Ag_(2)C_(2)`-white ppt.)
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