Assertion : Copper metal gets readily corroded in acidic aqueous

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 Multiple Choice QuestionsMultiple Choice Questions

621.

The correct order of increasing [H3O+] in the following aqueous solutions is

  • 0.01 M H2S < 0.01 M H2SO4 < 0.01M NaCl< 0.01 M NaNO2

  • 0.01 M NaCl<0.01 M NaNO2 <0.01 M H2S <0.01 M H2SO4

  • 0.01 M NaNO< 0.01 M NaCl < 0.01 M H2S <0.01 M H2SO4

  • 0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl <0.01M H2SO4


622.

During titration of acetic acid with aqueous NaOH solution, the neutralisation graph has a vertical line. This line indicates

  • alkaline nature of equivalence

  • acidic nature of equivalence

  • neutral nature of equivalence

  • depends on experimental proceeding


623.

The standard molar heat of formation of ethane ,CO2 and water are respectively - 21.1 , - 94.1 and - 68. 3 kcal .The standard molar heat of combustion of ethane will be :

  • - 372 kcal

  • 162 kcal

  • - 240 kcal

  • 183.5 kcal


624.

Assertion : According to Le-Chatelier's principle addition of heat to an equilibrium solid liquid results in decrease in the amount of solid.

Reason : Reaction is endothermic, so on heating forward reaction is favoured.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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625.

Assertion : Copper metal gets readily corroded in acidic aqueous solution.

Reason : Free energy change for this process is negative.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


D.

If both assertion and reason are false.

Non-oxidising acids (HCl and dil.H2SO4) do not have any effect on copper. However they dissolve the metal in presence of air. As it is a nonspontaneous process so, G can not be -ve.


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626.

Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature.

Reason : The composition of the final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


627.

Hydrolysis of sodium acetate gives :

  • acidic solution

  • basic solution

  • amphoteric solution

  • neutral solution


628.

Cationic hydrolysis gives the following solution :

  • acidic

  • basic

  • neutral

  • amphoteric


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629.

Number of moles of K2Cr2O7 reduced by one mole of Sn2+

  • 13

  • 3

  • 16

  • 6


630.

Suitable condition for melting of ice :

  • high temp. and high pressure

  • high temp. and low pressure

  • low temp. and low pressure

  • low temp. high pressure


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