How many of the following compound(s) does not release a gas that turns wet blue litmus paper red?

$B a C O_{3}, M g C O_{3}, N H_{4} H C O_{3}, (N H_{4})_{2} C O_{3}, M g (N O_{3})_{2}, M g C l_{2} .6 H_{2} O, S r C O_{3}, (N H_{4})_{2} C r_{2} O_{7}$

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Solution

$B a C O_{3} Δ - \to B a O + C O_{2}$
$M g C O_{3} Δ - \to M g O + C O_{2}$
$S r C O_{3} Δ - \to S r O + C O_{2}$
$N H_{4} H C O_{3} Δ - \to N H_{3} + H_{2} O + C O_{2}$
$(N H_{4})_{2} C O_{3} Δ - \to 2 N H_{3} + H_{2} O + C O_{2}$
$2 M g (N O_{3})_{2} Δ - \to 2 M g O + 4 N O_{2} + O_{2}$
$M g C l_{2} .6 H_{2} O Δ - \to M g O + 2 H C l + 5 H_{2} O$
$(N H_{4})_{2} C r_{2} O_{7} Δ - \to N_{2} + C r_{2} O_{3} + H_{2} O$

Aqueous solution of $C O_{2}$ and $N O_{2}$ gas is acidic in nature which turns blue litmus into red. But aqueous solution of $N_{2}$ gas is neutral.

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