Question # 1

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

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pH scale

pKa scale

pOH scale

Hydrogen scale

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

In MgCl2, the oxidation state ofCI is

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Zero

-2

+2

-1

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 is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

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

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

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

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

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Oxidation

reduction

Redox reaction

electrolysis

The potential difference set up at 25 C and 1 atm when clectrode is dipped m Tis one molar ionic sohution is called

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Single electrode potential

electrode potential

Standard electrode potential

Standard hydrogen electrode

The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

^{The common oxidation number of halogens is}

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-1

+1

-2

0

Total number of valence electrons in CH4

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8

9

10

12

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

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

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

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

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