What is the effect of HCL on following?
(a) Mg ribbon
(b) NaOH
(c) crushed eggshell

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Solution

$(a) H C l + M g R i b b o n$
${M g}_{(s)} + 2 H {C l}_{(a q)} \to {M g C l}_{2} + H_{2} ↑$
Hydrogen gas is generated.
$(b) H C l + N a O H \to N a C l + H_{2} O$
Heat is liberated, and neutralisation reaction takes place.
$(c) H C l + e g g s h e l l$
$e g g s h e l l = C a C O_{3}$
$2 H C l + C a C O_{3} \to {C a C l}_{2} + H_{2} O + {C O}_{2}$
egg shells dissolve, carbon dioxide is liberated.

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