Which substance is reduced in dry cell ?

A \(NH _4{ }^{+}\)
B graphite
C \(MnO _2\)
D Zn

Verified Solution

Answer & Solution

Correct Answer

(C) \(MnO _2\)

Step-by-step Solution

Detailed explanation

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Which product is not obtained when \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}\) react with \(\mathrm{H}_2 \mathrm{SO}_4\)?

GUJCET 2026 Easy
Which of the following will give \(H _{2(g)}\) at cathode and \(O _{2(g)}\) at anode on g electrolysis using platinum electrodes?

GUJCET 2014 Easy
Name the following reaction.

GUJCET 2024 Hard
Which reagent is required to convert cyclohexanol to cyclohexanone ?

GUJCET 2020 Hard
A + B = → product. The velocity for this process is \(= K | A |^2| B |^0\). What is the change in velocity when the ratio of A and B is doubled?

GUJCET 2013 Medium
Giving "T" symbol for true statement and "F" symbol for false statement select the correct option.
(i) Most naturally occurring amino acids have L-configuration.
(ii) β-D ribose sugar is present in RNA.
(iii) Amylose is water insoluble component made up of \(\alpha - D ^{+}\) glucose units.
(iv) All monosaccharides are non-reducing sugars.

GUJCET 2020 Medium

Explore more questions on app

From GUJCET

How much gram of ethanol is required to obtain 280 ml dihydrogen at S.T.P. by reaction of \(C _2 H _5 OH\) on with Na Metal ? (Mol.wt of ethanol =46 gm / mol)

GUJCET 2023 Easy
A short bar magnet placed with its axis at \(30^{\circ}\) and a uniform external magnetic field of 0.5 T experience torque of magnitude equal to \(4.5 \times 10^{-2} J\). Then the magnitude of the magnetic moment will be _________.

GUJCET 2024 Easy
The most reactive amine towards dil. HCl is ___________ .

GUJCET 2025 Easy
The half-life period for a radioactive substance is 15 minutes. How mary grams of this radioactive substance is decayed from 50 gram' of substance after one hour ?

GUJCET 2017 Hard
Benzoyl chloride + Sodium benzoate \(\xrightarrow{\Delta}\) __________.

GUJCET 2019 Hard
What is the magnitude of the equatorial fields due to a bar magnet of length 5.0 cm at a distance 75 cm from its mid point? The magnetic moment of the bar magnet is \(0.75 Am ^2\).

GUJCET 2021 Easy

Explore more questions on app