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Medical
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Which one of the following pairs of solution is not an acidic buffer?

  • Option 1)

    HClO_{4}\ and\ NaClO_{4}

  • Option 2)

    CH_3COOH\ and\ CH_3COONa

  • Option 3)

    H_2CO_3\ and\ Na_2CO_3

  • Option 4)

    H_3PO_4\ and\ Na_3PO_4

 
  Law of Chemical equilibrium - At a given temperature, the product of concentration of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentration of the reactants raised to their individual stoichiometric coefficients has a constant value. - wherein are equilibrium concentration    Acidic Buffer is a...
Medical
102 Views   |  

The K_{sp} \ of \ Ag_{2}CrO_{4}, Agcl, AgBr\ and\ AgI are respectively, 1.1\times 10^{-12}, 1.8\times 10^{-10}, 5.0\times 10^{-13}, 8.3\times 10^{-17}. Which one of the following salts will precipitate last if AgNO_{3} solution is added to the solution containing equal moles of NaCl, NaBr, Nal, and Na_{2}CrO_{4}?

  • Option 1)

    AgCl

  • Option 2)

    AgBr

  • Option 3)

    Ag_{2}CrO_{4}

  • Option 4)

    AgI

 
  General expression of solubility product - - wherein Its solubility product is        AgCrO4     1.1X10-12= 4 S3           1.8X10-10= S2               AgBr     5X1013 = S2                  AgI        8.3 X10-17 =  S2            Thus Ag2Cr04  will be precipitated last. Option 1) AgCl incorrect Option 2) AgBr incorrect Option 3) correct Option 4) AgI incorrect
Medical
101 Views   |  

The K_{sp} \ of \ Ag_{2}CrO_{4}, Agcl, AgBr\ and\ AgI are respectively, 1.1\times 10^{-12}, 1.8\times 10^{-10}, 5.0\times 10^{-13}, 8.3\times 10^{-17}. Which one of the following salts will precipitate last if AgNO_{3} solution is added to the solution containing equal moles of NaCl, NaBr, Nal, and Na_{2}CrO_{4}?

  • Option 1)

    AgCl

  • Option 2)

    AgBr

  • Option 3)

    Ag_{2}CrO_{4}

  • Option 4)

    AgI

 
  General expression of solubility product - - wherein Its solubility product is        AgCrO4     1.1X10-12= 4 S3           1.8X10-10= S2               AgBr     5X1013 = S2                  AgI        8.3 X10-17 =  S2            Thus Ag2Cr04  will be precipitated last. Option 1) AgCl incorrect Option 2) AgBr incorrect Option 3) correct Option 4) AgI incorrect
Medical
111 Views   |  

What is the pH of the resulting solution when equal  volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

  • Option 1)

    12.65

  • Option 2)

    2.0

  • Option 3)

    7.0

  • Option 4)

    1.04

 
  Relation between Ka and Kb -     - wherein    .01 mole of NaOH will be completely neutralised by .01 mole of HCl. Hence remaining part of NaOH is .09 mole. as equal volume is mixed [OH-]=.04514 P(H) = 14- P(OH) = 14-log [OH-] =12.65   Option 1) 12.65 correct Option 2) 2.0 incorrect Option 3) 7.0 incorrect Option 4) 1.04 incorrect
Medical
88 Views   |  

Which of the following statements is correct for a reversible process in a state of equilibrium?

  • Option 1)

    \Delta G=2.30\ RT\ log \ K

  • Option 2)

    \Delta G^{o}=-2.30\ RT\ log \ K

  • Option 3)

    \Delta G^{o}=2.30\ RT\ log \ K

  • Option 4)

    \Delta G=-2.30\ RT\ log \ K

 
As we discussed in concept Relation between Gibbs energy and reaction Quotient -     - wherein is standard Gibbs energy.       Option 1) This option is incorrect. Option 2) This option is correct. Option 3) This option is incorrect. Option 4) This option is incorrect.
Medical
89 Views   |  

If the value of an equilibrium constant for a particular reaction is 1.6\times10^{12} then at equilibrium the system will contain 

  • Option 1)

    mostly reactants 

  • Option 2)

    mostly products 

  • Option 3)

    similar amounts of reactants and products 

  • Option 4)

    all reactants 

 
As we learnt in concept Composition of equilibrium mixture when Kc > 1000 - If Kc > 103,  products predominate over reactants i.e. if Kc is very large, the reaction proceeds nearly to completion. - wherein e.g.           The valve of K is very high means reaction proceeds almost to completion i.e. the system will contain mostly products. Option 1) mostly reactants  This option is...
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