Question # 1

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?

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Magnesium bromide

Magnesium sulphate

Copper sulphate

Copper chloride

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

Which one of the following elements is the strongest reducing agent?

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Chlorine

Sodium

Magnesium

Aluminium

Which of the following bonds is not present in NH4CL

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lonic bond

Covalent bond

Co-ordinate covalent bond

De-localized covalent bond

Only those metals can replace Hydrogen from dilute acids, which have

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High negative reduction potential

Low negative reduction potential

High positive reduction potential

low positive reduction potential

Coinage metals Cu, Ag and Au are the least reactive because they have

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Negative reduction potential

Negative oxidation potential

Positive reduction potential

Positive oxidation potential

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

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Oxidation

reduction

Redox reaction

electrolysis

The element with highest E°red

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N

F

O

CI

The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts

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A

C

B

D

^{The common oxidation number of halogens is}

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-1

+1

-2

0

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

The working condition/s for SHE

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1atm pressure

1M H-solution

298K temperature

All of these

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode

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H2

O2

Cu

CI

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

Coinage metals Cu. Ag, and Au are the least reactive because they have

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Negative reduction potential

Positive reduction potential

Negative oxidation potential

Positive oxidation potential

During the electrolysis of Fused NaCI, the products are

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Na and H2

Na and Cl2

Na and O2

H2 and Cl2

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