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CBSE

NEET Chemistry : પૃષ્ઠરસાયણ

Multiple Choice Questions

61. કૅલ્શિયમ એસિટેટના સંતૃપ્ત જલીય દ્વાવણમાં આલ્કોહોલ ઉમેરવાથી પ્રથમ તે સોલ બનાવે છે, ત્યાર બાર તેમાં જીલેટિન જેવો દળદાર પદાર્થ મળે છે, જેને ઘન આલ્કોહોલ કહે છે, તો તે શું હશે ?

એરોસોલ
પ્રવાહી સોલ
જૅલ
ઘનફોમ

62.

10⁵
10⁶
10⁴
10³

10⁴

1nm àª¤à«àª°àª¿àªœà«àª¯àª¾ àª§àª°àª¾àªµàª¤àª¾ àª¸àªªà«àª¸à«‡àª¨à«àª¸àª¨àª•àª£àª¨à«àª‚ àª•àª¦ $equals space 4 over 3 space πr cubed$ $equals space 4 over 3 space straight pi space left parenthesis 0.1 right parenthesis cubed space equals space 4 over 3 space straight pi space cross times space 10 to the power of negative 3 end exponent space$ àª¸à«‡àª®à«€³

$1000 space straight A degree space left parenthesis 10 to the power of negative 5 end exponent$ (àª¸à«‡àª®à«€) àª¤à«àª°àª¿àªœà«àª¯àª¾ àª§àª°àª¾àªµàª¤àª¾ àª•àª²àª¿àª² àª•àª£àª¨à«àª‚ àª•àª¦ $equals space 4 over 3 space straight pi space left parenthesis 10 to the power of negative 5 end exponent right parenthesis cubed space equals space 4 over 3 straight pi space cross times space 10 to the power of negative 15 end exponent$ àª¸à«‡àª®à«€³
àªªà«àª°àª¾àªªà«àª¤ àª¥àª¯à«‡àª² àª•àª²àª¿àª² àª•àª£à«‹àª¨à«€ àª¸àª‚àª–à«àª¯àª¾ $equals space fraction numerator begin display style bevelled 4 over 3 end style space straight p space cross times space 10 to the power of negative 3 end exponent over denominator begin display style bevelled 4 over 3 end style space straight p space cross times space 10 to the power of negative 15 end exponent end fraction space equals space 10 to the power of 12$

àª•àª²àª¿àª² àª•àª£à«‹àª¨à«€ àª¸àªªàª¾àªŸà«€àª¨à«àª‚ àª•à«àª·à«‡àª¤à«àª°àª«àª³ $equals space 4 πr squared space$

$equals space 4 space straight pi space left parenthesis 10 to the power of negative 5 end exponent right parenthesis squared space equals space 4 straight pi space left parenthesis 10 to the power of space minus 10 end exponent space àª¸ à«‡ àª® à«€ squared space space space space space space space space space space space space$

$therefore space 10 to the power of 12$ àª•àª£à«‹àª¨à«àª‚ àª•à«àª² àª¸àªªàª¾àªŸà«€àª¨à«àª‚ àª•à«àª·à«‡àª¤à«àª°àª«àª³ $space equals space 4 straight pi space 10 to the power of negative 10 end exponent space cross times space 10 to the power of 12 space equals space 4 straight pi space cross times space 10 squared$ àª¸à«‡àª®à«€²

$therefore space fraction numerator àª•àª² àª¿ àª²àª•àª£ à«‹ àª¨ à«€ space àª¸àªª àª¾ àªŸ à«€ àª¨ à«àª‚ space àª• à« àª· à«‡ àª¤ à« àª°àª«àª³ space over denominator àª¸àªª à« àª¸ à«‡ àª¨ à« àª¸àª¨ space àª•àª£ à«‹ àª¨ à«àª‚ space àª• à« àª² space àª• à« àª· à«‡ àª¤ à« àª°àª«àª³ end fraction equals space fraction numerator 4 straight p space cross times space 10 squared over denominator 4 straight p space cross times space 10 to the power of negative 2 end exponent end fraction space equals space 10 to the power of 4$

àª•àª²àª¿àª² àª•àª£à«‹àª¨à«€ àª¸àªªàª¾àªŸà«€àª¨à«àª‚ àª•à«àª·à«‡àª¤à«àª°àª«àª³ $equals space 4 πr squared space$

63.

$straight V subscript straight C over straight V subscript straight S space asymptotically equal to space 10 cubed$
$straight V subscript straight C over straight V subscript straight S space asymptotically equal to space 10 to the power of negative 3 end exponent$
$straight V subscript straight C over straight V subscript straight S space asymptotically equal to space 1$
$straight V subscript straight C over straight V space equals space 1$