Question # 1

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

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Oxidation

reduction

Redox reaction

electrolysis

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

The standard electrode potential of hydrogen is arbitrarily taken at 298k is

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1.00volt

0.10 volt

0.00 volt

10.0 volt

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

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

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

Which of following is oxidation state of oxygen in peroxides?

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-2

1/2

-1

+2

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

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

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Chlorine

Sodium

Magnesium

Aluminium

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

The products of electrolysis of which of the followings are known

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Fused electrolyte

Aqueous solution of eleetrolyte

Solid electrolyte

Solid metal

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

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

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