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NEET Chemistry : સંતુલન

Multiple Choice Questions

51.

જો 0.005 M કોકેઇન (C18H21NO3) ના જલીય દ્વાવણની pH9.95  હોય, તો તેના pkb નું મૂલ્ય કેટલું થશે ?

  • 3.76

  • 8.92

  • 5.81

  • 4.92


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52.
એક જલીય દ્વાવણ વજનથી 10 % એમોનિયા ધરાવે છે અને તેની ઘનતા 0.99 ગ્રામ સેમી-3 છે. જો NH4 માટે ka નું મૂલ્ય bold 5 bold space bold cross times bold space bold 10 to the power of bold minus bold 10 end exponent bold space bold M હોય, તો હાઇડ્રોજન આયનની સાંદ્વતા કેટલી થશે ?
  • 9.27 space cross times space 10 to the power of negative 6 end exponent space straight M

  • 9.27 space cross times space 10 to the power of negative 13 end exponent space straight M

  • 9.27 space cross times space 10 to the power of negative 10 end exponent space straight M

  • 9.27 space cross times space 10 to the power of negative 11 end exponent space straight M


B.

9.27 space cross times space 10 to the power of negative 13 end exponent space straight M

NH subscript 3 space plus space straight H subscript 2 straight O space space space space space space space space space space rightwards harpoon over leftwards harpoon with space space space space space space space space space on top space space NH subscript 4 to the power of plus space space space space space space space space plus space space space space space space space space space space space space OH to the power of minus

શરૂઆતમાં          5.8         -                       -
સંતુલને             5.8-x      x                       x

therefore space straight k straight b space equals space fraction numerator left parenthesis straight x right parenthesis space left parenthesis straight x right parenthesis over denominator 5.8 minus straight x end fraction space almost equal to space fraction numerator space space straight x squared over denominator 5.8 space minus space straight x end fraction space space space space space space space space space space space space space space space space space space... space left parenthesis 1 right parenthesis space

તથા space straight k subscript straight b space equals space Kw over Kα space equals space fraction numerator 10 to the power of negative 14 end exponent over denominator 5 space cross times space 10 to the power of negative 10 end exponent end fraction space equals space 2 space cross times space 10 to the power of negative 5 end exponent space space space space space space space space space space space... space left parenthesis ii right parenthesis 
સમીકરણ (i) અને (ii) ને સરખાવી

space straight x space equals space left parenthesis OH to the power of minus right parenthesis space space equals space 1.078 space cross times space space space 10 to the power of negative 2 end exponent space straight M મળે. 

therefore space left square bracket straight H to the power of plus right square bracket space equals space fraction numerator Kw over denominator left square bracket OH to the power of minus right square bracket end fraction space પરથી left square bracket straight H to the power of plus right square bracket મળે.

NH subscript 3 space plus space straight H subscript 2 straight O space space space space space space space space space space rightwards harpoon over leftwards harpoon with space space space space space space space space space on top space space NH subscript 4 to the power of plus space space space space space space space space plus space space space space space space space space space space space space OH to the power of minus

શરૂઆતમાં          5.8         -                       -
સંતુલને             5.8-x      x                       x

therefore space straight k straight b space equals space fraction numerator left parenthesis straight x right parenthesis space left parenthesis straight x right parenthesis over denominator 5.8 minus straight x end fraction space almost equal to space fraction numerator space space straight x squared over denominator 5.8 space minus space straight x end fraction space space space space space space space space space space space space space space space space space space... space left parenthesis 1 right parenthesis space

તથા space straight k subscript straight b space equals space Kw over Kα space equals space fraction numerator 10 to the power of negative 14 end exponent over denominator 5 space cross times space 10 to the power of negative 10 end exponent end fraction space equals space 2 space cross times space 10 to the power of negative 5 end exponent space space space space space space space space space space space... space left parenthesis ii right parenthesis 
સમીકરણ (i) અને (ii) ને સરખાવી

space straight x space equals space left parenthesis OH to the power of minus right parenthesis space space equals space 1.078 space cross times space space space 10 to the power of negative 2 end exponent space straight M મળે. 

therefore space left square bracket straight H to the power of plus right square bracket space equals space fraction numerator Kw over denominator left square bracket OH to the power of minus right square bracket end fraction space પરથી left square bracket straight H to the power of plus right square bracket મળે.


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53.

પિરિડિનિયમ હાઇડ્રોક્લોરાઈડના 0.02M જલીય દ્વાવણની pH = 3.44 હોય, તો પિરિડિનનો આયનીકરણ અચળાંક કેટલો થશે ?

  • 3.62 space cross times space 10 to the power of negative 7 end exponent

  • 2.63 space cross times 10 to the power of negative 9 end exponent

  • 1.5 space cross times space 10 to the power of negative 9 end exponent

  • 1.84 space cross times space 10 to the power of negative 7 end exponent


54. ઍસિડ HQના 0.1 M જલીય દ્વાવણની pH 3 છે, તો આ ઍસિડનો આયનીકરણ અચળાંક કેટલો થશે ?
  • 1 space cross times space 10 to the power of negative 7 end exponent
  • 1 space cross times space 10 to the power of negative 5 end exponent
  • 1 space cross times space 10 to the power of negative 3 end exponent
  • 3 space cross times 10 to the power of negative 1 end exponent

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55. નિર્બળ ઍસિડ HA નું pka નું મૂલ્ય 4.80 છે. નિર્બળ બેઇઝ BOH નું pkમૂલ્ય 4.78 છે, તો તેમાંથી મેળવાતા ક્ષાર BA ના જલીય દ્વાવણની pH કેટલી થશે ?
  • 9.22

  • 4.79

  • 7.01

  • 9.58


56.
pH નું 2 મૂલ્ય ધરાવતા HCl ના 200 મિલિ જલીય દ્વાવણને pH નું 12 મૂલ્ય ધરાવતા NaOHના 300 મિલિ જલીય દ્વાવણ સાથે મિશ્ર કરતાં મળતા મિશ્ર દ્વાવણની  pH કેટલી થશે ?
  • 7

  • 12

  • 2

  • 11.3


57. નીચેનામાંથી કયા ઍસિડના pka નું મૂલ્ય સૌથી ઓછું હશે ?
  • CH3COOH

  • HCOOH

  • (CH3)2 CHCOOH

  • CH3CH2COOH


58. 0.20 Mહાઇડ્રોસાયનિક ઍસિડ માટે kaનું મૂલ્ય 4.9 space cross times space 10 to the power of negative 10 end exponent છે, તો તેની વિયોજનની ટકાવારી કેટલી થશે ?
  • 0.00495 %

  • 0.0495 %

  • 0.00549 %

  • 4.95 %


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59. પ્રબળ ઍસિડના દ્વાવણની pH 5.0 છે, જો આપેલ 100 ગણું મંદ કરવામાં આવે, તો મંદન પછી દ્વાવનની pH કેટલી થશે ?
  • 13

  • 6.7

  • 5.8

  • 9.3


60.
10.65 pH ધરાવતું[Ca(OH)2]નું જલીય દ્વાવણ બનાવવા માટે 250 મિલિ પાણીમાં તેના કેટલા મોલ ઓગાળવા પડશે ? Ca(OH)2નું સંપૂર્ણ વિયોજન થાય છે. 
  • 0.47 space cross times space 10 to the power of negative 4 end exponent
  • 0.56 space cross times space 10 to the power of negative 4 end exponent
  • 0.48 space cross times space 10 to the power of negative 4 end exponent
  • 0.68 space cross times space 10 to the power of negative 4 end exponent

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