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Equilibrium

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Chemistry Part I

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Chemistry

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Class 10 Class 12

The exothermic formation of ClF3 is represented by the equation
Cl subscript 2 left parenthesis straight g right parenthesis space plus space 3 straight F subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon with space space space space space space space on top space 2 ClF subscript 3 space left parenthesis straight g right parenthesis space semicolon space increment rH space equals negative 329 space kJ
Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3?

  • Increasing the temperature

  • Removing Cl2

  • Increasing the volume of the container

  • Adding F2


D.

Adding F2

straight M subscript 3 straight V subscript 3 space equals space straight M subscript 1 straight V subscript 2 space plus space straight M subscript 2 straight V subscript 2
straight M space equals space fraction numerator 480 space left parenthesis 1.5 right parenthesis space plus space 520 space left parenthesis 1.2 right parenthesis over denominator 1000 end fraction space equals space 1.344 space straight M
straight M subscript 3 straight V subscript 3 space equals space straight M subscript 1 straight V subscript 2 space plus space straight M subscript 2 straight V subscript 2
straight M space equals space fraction numerator 480 space left parenthesis 1.5 right parenthesis space plus space 520 space left parenthesis 1.2 right parenthesis over denominator 1000 end fraction space equals space 1.344 space straight M
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An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

  • Base Acid End Point
    Strong  Strong Pink to colourless
  • Base Acid End Point
    Weak  Strong Colourless to pink
  • Base Acid End Point
    Strong  Strong Pinkish Red to Yellow
  •  

    Base Acid End Point
    Weak Strong Yellow to Pinkish Red

D.

 

Base Acid End Point
Weak Strong Yellow to Pinkish Red

Methyl orange is the weak organic base. It is used in the titration of WB vs SA

MeOHUnionized form Yellow  Me+ Ionized form (Red)+ OH-

In a basic medium, equilibrium lies in the backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forwarding direction and therefore, colour changes from yellow to red.

Methyl orange is the weak organic base. It is used in the titration of WB vs SA

MeOHUnionized form Yellow  Me+ Ionized form (Red)+ OH-

In a basic medium, equilibrium lies in the backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forwarding direction and therefore, colour changes from yellow to red.


If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains

  • all reactants

  • mostly reactants

  • mostly products

  • similar amounts of reactants and products


C.

mostly products

For a reaction,

stack straight A space with Reactant below leftwards harpoon over rightwards harpoon space straight B with product below

straight K space equals space fraction numerator left square bracket straight B right square bracket subscript eq over denominator left square bracket straight A right square bracket space subscript eq end fraction space equals space 1.6 space straight x space 10 to the power of 12 space equals space fraction numerator left square bracket straight B right square bracket subscript eq over denominator left square bracket straight A right square bracket subscript eq end fraction

therefore space left square bracket straight B right square bracket subscript eq space greater than greater than space left square bracket straight A right square bracket subscript eq
So, mostly the product will be present in the equilibrium mixture.

For a reaction,

stack straight A space with Reactant below leftwards harpoon over rightwards harpoon space straight B with product below

straight K space equals space fraction numerator left square bracket straight B right square bracket subscript eq over denominator left square bracket straight A right square bracket space subscript eq end fraction space equals space 1.6 space straight x space 10 to the power of 12 space equals space fraction numerator left square bracket straight B right square bracket subscript eq over denominator left square bracket straight A right square bracket subscript eq end fraction

therefore space left square bracket straight B right square bracket subscript eq space greater than greater than space left square bracket straight A right square bracket subscript eq
So, mostly the product will be present in the equilibrium mixture.

1313 Views

For a spontaneous reaction the ∆G, equilibrium constant (K) and Eocell will be respectively 

  • -ve, >1, +ve

  • +ve, >1, -ve

  • -ve, <1, -ve

  • -ve, >1, -ve


A.

-ve, >1, +ve

169 Views

Which of the following salts will give highest pH in water?

  • KCl

  • NaCl

  • Na2CO3

  • CuSO4


C.

Na2CO3

The highest pH refers to the basic solution containing OH- ions. Therefore, the basic salt releasing OH- ions on hydrolysis will give highest pH in water.
Only the salt of a strong base and weak acid would release OH-ion on hydrolysis. Among the given salts, Na2CO3 corresponds to the basic salt as it is formed by the neutralisation of NaOH [strong base] and H2CO3 [weak acid].

CO subscript 3 superscript 2 minus end superscript space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon HCO subscript 3 superscript minus space plus OH to the power of minus

The highest pH refers to the basic solution containing OH- ions. Therefore, the basic salt releasing OH- ions on hydrolysis will give highest pH in water.
Only the salt of a strong base and weak acid would release OH-ion on hydrolysis. Among the given salts, Na2CO3 corresponds to the basic salt as it is formed by the neutralisation of NaOH [strong base] and H2CO3 [weak acid].

CO subscript 3 superscript 2 minus end superscript space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon HCO subscript 3 superscript minus space plus OH to the power of minus

1725 Views