Which statement about standard reduction...

Which statement about standard reduction potentials is correct?

`E_(H^-//H_2)^@` gt 0

`E_(D^1//D_2)^@` lt 0

A redox reaction is feasible if sum of SRP of oxidant and that of reductant is a positive quantity

`K_2Cr_2O_7` is stronger oxidising agent than `KMnO_4` in acidic medium

Verified by Experts

The correct Answer is:

For a spontaneous reaction, `DeltaD=-Ve`
which is possible if `"^@E` is +ve because, `DeltaG=-nFE^@`

ELECTROCHEMISTRY
MTG GUIDE|Exercise NEET Café (Topicwise Practice Questions) (NERNST EQUATION) |8 Videos
ELECTROCHEMISTRY
MTG GUIDE|Exercise NEET Café (Topicwise Practice Questions) (CONDUCTANCE OF ELECTROLYTIC SOLUTIONS) |42 Videos
ELECTROCHEMISTRY
MTG GUIDE|Exercise AIPMT/NEET(MCQs) |5 Videos
COORDINATION COMPOUNDS
MTG GUIDE|Exercise CHECK YOUR NEET VITALS|30 Videos
GENERAL PRINCIPALS AND PROCESSES OF ISOLATION OF ELEMENTS
MTG GUIDE|Exercise AIPMT/NEET (MCQs)|10 Videos

Standard reduction potentials (SRP) for different systems can be used to decide the spontaneity of a reaction e.g., E_(2n^(2+)//Zn)^(@)=-0.76V , hence for the reaction Zn+2H^(+)rarrZn^(2+)+H_(2),DeltaG^(@) is negative. It has been found experimentally that if (SRP of an oxidant-SRP of a reductant) is more than 1.7V, then their combination may lead to explosion (though it may be prevented by kinetic factors). Now go through the following data and answer the questions. Data: Which statement about standard reduction potentials in correct?

`E_(H^(+)//H_(2))^(@)=` zero at all temperature

`E_(D^(+)//D_(2))^(@)=` Zero at 298 K

A redox reaction is feasible if sum of SRP of oxidant and that of reductant is a negative quantity.

`K_(2)Cr_(2)O^(7)` (acid) is stronger oxidising agent than `KMnO_(4)` (acid).

`27^(@)C`

`25^(@)C`

`0^(@)C`

`100^(@)C`

A `sigma` bond has cylindrical symmetry about the bonding axis.

A `sigma` bond is twice as strong as a `sigma` bond.

A double bond consists of two `pi` bonds always.

A `pi` bond results from the sideways overlap of hybridized orbitals.