Question

which one of the following reactions involves involves oxidation- reduction ?
(a) H2 + Br2 → 2HBr
(b) NaBr + HCl → NaCl + HBr
(c) HBr + AgNo3 → AgBr + HNO3
(d) 2NaOH + H2SO4 → Na2SO4 + 2H2O​

Answer 1

Answer:

3

Explanation:

(3) HBr+ AgNo3 = AgBr+HNO3

Answer 2

$\huge {\orange {\bf {\underline {\underline {ÀnSwer}}}:-}}$

which one of the following reactions involves involves oxidation- reduction ?

☑ (a) H$</strong><strong> </strong><strong>\</strong><strong>s</strong><strong>f</strong><strong> </strong><strong>_2$ +Br$</strong><strong>\sf </strong><strong>_2$ → 2HBr

(b) NaBr + HCl → NaCl + HBr

(c) HBr + $\sf AgNO_3$ → AgBr +$\sf HNO_3$

(d) 2NaOH + $\sf H_2 SO_4$ → $\sf Na_2 SO_4$ + $2H_2 O$

Option (a) $\sf H_2$ + $\sf Br_2$ → 2HBr is right

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Explaination :-

(a) $\sf H_2$ + $\sf Br_2$ → 2HBr

• This is oxidation reduction reaction because during this reaction oxidation number are changing.

(b) NaBr + HCl → NaCl + HBr

• It is a substitution reaction.

(c) HBr + $\sf AgNO_3$ → AgBr +$\sf HNO_3$

• It is substitution and precipitation reaction because AgBr is precipitated during this reaction.

(d) 2NaOH + $\sf H_2 SO_4$ → $\sf Na_2 SO_4$ + $\sf 2H_2 O$

• It is a neutralization reaction because acid and base are reacting to produce salt and water.

Hence, Option (a) $\sf H_2$ + $\sf Br_2$ → 2HBr is correct