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Q.

Which reagents produce gas when combined?
(P) HCI and ${Na}_{2} {SO}_{3}$ (Q) NaOH and Al

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a

P only

b

Q only

c

Both P and Q

d

Neither P nor Q

answer is C.

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Detailed Solution

Reaction for HCI and ${Na}_{2} {SO}_{3}$ ,

${Na}_{2} {SO}_{3} + HCl ⟶ {SO}_{2} + {NaCl}_{2} + H_{2} O;$

Reaction for NaOH and Al.

$NaOH + Al ⟶ H_{2} + {NaAlO}_{2}$

The correct option is C.

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Which reagents produce gas when combined?(P) HCI and Na2SO3 (Q) NaOH and Al