Question # 1

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

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

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

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 electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

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

Which of following is oxidation state of oxygen in peroxides?

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-2

1/2

-1

+2

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

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H2

O2

Cu

CI

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

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Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

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

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

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

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

SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode

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Zn has less reduction potential than hydrogen and Cu

Zn has high reductionl potential than hydrogen

and Cu

Zn is below electrochemical series than hydrogen and Cu

Zn has least tendency to lose electron

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MDCAT Chemistry Chapter 8 Thermo-chemistry and Energetics of chemical reactions Online Test MCQs With Answers

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