Zn gives `H_(2)` gas with `H_(2)SO_(4)` and HCl but not with `HNO_(3)` becauseA. `Zn` acts as oxidizing agent when reacts with `HNO_(3)`B. `HNO_(3)` is weaker acid than `H_(2)SO_(4)` and HClC. In electrochemical series, Zn is above hydrogenD. `NO_(3)^(-)` is reduced in preference to hydronium ion

Zn gives `H_(2)` gas with `H_(2)SO_(4)` and HCl but not with `HNO_(3)`

1.	Zn gives `H_(2)` gas with `H_(2)SO_(4)` and HCl but not with `HNO_(3)` becauseA. `Zn` acts as oxidizing agent when reacts with `HNO_(3)`B. `HNO_(3)` is weaker acid than `H_(2)SO_(4)` and HClC. In electrochemical series, Zn is above hydrogenD. `NO_(3)^(-)` is reduced in preference to hydronium ion
Answer» Correct Answer - B In the given reaction, `I^(-)` has been oxidized to `I_(2)` and `Cr_(2)O_(7)^(2-)` ions have been reduced to `Cr^(3+)` `thereforeE_(cell)^(@)=E_(Cr_(2)O_(7)^(2-))^(@)-E_(I_(2))^(@)` i.e., `0.79=1.33-E_(I_(2))^(@)` or `E_(I_(2))^(@)=0.54V`

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Based on the data given below, the correct order of reducing power is: `Fe_((aq.))^(3+) + e rarr Fe_((aq.))^(2+), E^(@) = +0.77 V` `Al_((aq.))^(3+) + 3e rarr Al_((s)), E^(@) = -1.66 V` `Br_(2(aq.)) + 2e rarr 2Br_((aq.))^(-), E^(@) = +1.08 V`A. `Br^(-) lt Fe^(2+) lt A1`B. `Fe^(2+) lt Al lt Br^(-)`C. `Al^(-) lt Br^(-) lt Fe^(2+)`D. `Al^(-) lt Fe^(2+) lt Br^(-)`
Based on the data given below, the correcy order of reducing power is: `Fe_((aq.))^(3+) + e rarr Fe_((aq.))^(2+), E^(@) = +0.77 V` `Al_((aq.))^(3+) + 3e rarr Al_((s)), E^(@) = -1.66 V` `Br_(2(aq.)) + 2e rarr 2Br_((aq.))^(-), E^(@) = +1.08 V`A. `Br^(-) lt Fe^(2+) lt Al`B. `Fe^(2+) lt Al lt Br^(-)`C. `Al lt Br^(-) lt Fe^(2+)`D. `Al lt Fe^(2+) lt Br^(-)`
Based on the data given below, the correcy order of reducing power is: `Fe_((aq.))^(3+) + e rarr Fe_((aq.))^(2+), E^(@) = +0.77 V` `Al_((aq.))^(3+) + 3e rarr Al_((s)), E^(@) = -1.66 V` `Br_(2(aq.)) + 2e rarr 2Br_((aq.))^(-), E^(@) = +1.08 V`A. `Br^(-) lt Fe^(2+) lt Al`B. `Fe^(2+) lt Al lt Br^-`C. `Al lt Br^(-) lt Fe^(2+)`D. `Al lt Fe^(2+) lt Br^(-)`
What are elementary reactions ?

Zn gives `H_(2)` gas with `H_(2)SO_(4)` and HCl but not with `HNO_(3)` becauseA. `Zn` acts as oxidizing agent when reacts with `HNO_(3)`B. `HNO_(3)` is weaker acid than `H_(2)SO_(4)` and HClC. In electrochemical series, Zn is above hydrogenD. `NO_(3)^(-)` is reduced in preference to hydronium ion

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