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Which of the following are redox reactio...

Which of the following are redox reaction ?

A

`BaCl_2 +H_2SO_4 rarr BaSO_4 +2HCl`

B

`Zn+2HCl rarr ZnCl_2 +H_2`

C

`6CO_2+6H_2O rarr C_6H_(12)O_6+6O_2`

D

`KCN +AgCN rarrK[Ag(CN)_2]`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given reactions are redox reactions, we need to analyze the oxidation states of the elements involved in each reaction. A redox reaction involves both oxidation (loss of electrons) and reduction (gain of electrons) occurring simultaneously. ### Step-by-Step Solution: 1. **Identify the Reactions**: We have four reactions labeled A, B, C, and D. We will analyze each one. 2. **Analyze Reaction A**: - Reaction: BACl + H2SO4 → BSO4 + 2HCl - Oxidation states: - Barium (Ba) remains +2 in both reactants and products. - Chlorine (Cl) remains -1 in both reactants and products. - Sulfur (S) remains +6 in both reactants and products. - Hydrogen (H) remains +1 in both reactants and products. - Oxygen (O) remains -2 in both reactants and products. - Conclusion: No change in oxidation states; therefore, **not a redox reaction**. 3. **Analyze Reaction B**: - Reaction: Zn + 2HCl → ZnCl2 + H2 - Oxidation states: - Zinc (Zn) changes from 0 (elemental) to +2 (in ZnCl2) → **oxidation**. - Hydrogen (H) changes from +1 (in HCl) to 0 (in H2) → **reduction**. - Conclusion: Both oxidation and reduction occur; therefore, **this is a redox reaction**. 4. **Analyze Reaction C**: - Reaction: C + O2 → CO2 - Oxidation states: - Carbon (C) changes from +4 (in CO2) to 0 (elemental) → **reduction**. - Oxygen (O) changes from -2 (in O2) to 0 (elemental) → **oxidation**. - Conclusion: Both oxidation and reduction occur; therefore, **this is a redox reaction**. 5. **Analyze Reaction D**: - Reaction: KCN + AgCN → KAgCN2 - Oxidation states: - Potassium (K) remains +1 in both reactants and products. - Cyanide (CN) remains -1 in both reactants and products. - Silver (Ag) remains +1 in both reactants and products. - Conclusion: No change in oxidation states; therefore, **not a redox reaction**. ### Final Answer: The reactions that are redox reactions are **B and C**.
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Knowledge Check

  • Which of the following is redox reaction ?

    A
    `H_(2)SO_(4)` with `NaOH`
    B
    In atmosphere, `O_(3)` from `O_(2)` by lighting
    C
    Nitrogen oxides from nitrogen and oxygen by lightning
    D
    Evaporation of `H_(2)O`

  • Which of the following is redox reaction?

    A
    1-Butyne `underset(BaSO_(4))overset(Pd//C-H_(2))to`
    B
    2-Butyne `overset(NaNH_(2))to`
    C
    1-Butyne `overset(Alc.KOH)to`
    D
    `HC-=CH underset("Copper tube")overset("red hot")to`

  • Which of the following is redox reaction?

    A
    `2Na[Ag(CN)_(2)]+Zn to Na_(2)[Zn(CN)_(4)]+2Ag`
    B
    `BaO_(2)+H_(2)SO_(4) to BaSO_(4)+H_(2)O_(2)`
    C
    `N_(2)O_(5)+H_(2)O to 2HNO_(3)`
    D
    `AgNO_(3)+KI to AgI+KNO_(3)`