Question # 1

Which of the following is an application of electrochemical series

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Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

Which of following is oxidation state of oxygen in peroxides?

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-2

1/2

-1

+2

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

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

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

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

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

If a strip of Cu metal is placed in a solution of FeSO4

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Cu will be deposited

Cu and Fe both dissolve

Fe is precipitated out

No reaction take place

^{The common oxidation number of halogens is}

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-1

+1

-2

0

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

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

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H2

O2

Cu

CI

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

In voltaic cell a saht bridge is used in order to

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Pass the electric current

Prevent the flow of ions

Mix solutions of two half cells

Allow movement of' ions between two cells

The element with highest E°red

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N

F

O

CI

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

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

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pH scale

pKa scale

pOH scale

Hydrogen scale

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