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Medical
584 Views   |   5 months, 1 week ago

For a given reaction, \DeltaH = 35.5 kJ mol-1 and \DeltaS = 83.6 JK-1 mol-1. The reaction is spontaneous at : (Assume that \DeltaH and \DeltaS do not vary with temperature)

  • Option 1)

    T < 425 K

  • Option 2)

    T > 425 K

  • Option 3)

    all temperatures

  • Option 4)

    T > 298 K

 

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S Satyajeet kumar
Answered 5 months, 1 week ago
Since,  for spontaneous reaction  i.e.  Therefore,  Option 1) T < 425 K This option is incorrect. Option 2) T > 425 K This option is correct. Option 3) all temperatures This option is incorrect. Option 4) T > 298 K This option is incorrect.
Medical
349 Views   |   5 months, 1 week ago

Which one of the following nitro-compounds does not react with nitrous acid?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

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S Satyajeet kumar
Answered 5 months, 1 week ago
  Victor meyer Test:   group  present at a carbon atom do not reacts with  Option 1) This option is incorrect. Option 2) This option is incorrect. Option 3) This option is correct. Option 4) This option is incorrect.
Medical
99 Views   |   5 months, 2 weeks ago

Which one of the followng statements related to lanthanons is incorrect?

  • Option 1)

    Europium shows +2 oxidation state.

  • Option 2)

    The basicity decreases as the ionic radius decreases from Pr to Lu.

  • Option 3)

    All the lanthanons are much more reactive than aluminium.

  • Option 4)

    Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis

 

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P Plabita
Answered 5 months, 1 week ago
As we discussed in the concept  Reactivity of lanthanons matches with alkaline metals specially barium due to being the number of same period Option 1) Europium shows +2 oxidation state. Option is incorrect Option 2) The basicity decreases as the ionic radius decreases from Pr to Lu. Option is incorrect Option 3) All the lanthanons are much more reactive than aluminium. Option is...
Medical
361 Views   |   5 months, 2 weeks ago

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

  • Option 1)

    rate is proportional to the surface coverage

  • Option 2)

    rate is inversely proportional to the surface coverage

  • Option 3)

    rate is independent of the surface coverage

  • Option 4)

    rate of decomposition is very slow

 

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P Plabita
Answered 5 months, 1 week ago
As we Discussed in Concept   The decomposition of PH3 on tungsten at low pressure is a first order reaction if because rate is Proportional to the surface coverage  Option 1) rate is proportional to the surface coverage Option is Correct Option 2) rate is inversely proportional to the surface coverage Option is incorrect Option 3) rate is independent of the surface coverage Option is...
Medical
328 Views   |   5 months, 2 weeks ago

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

  • Option 1)

    0

  • Option 2)

    1

  • Option 3)

    2

  • Option 4)

    3

 

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P Plabita
Answered 5 months, 1 week ago
As we learned in concept Clearly van't Hoff factor is 3 Option 1) 0 This option is incorrect. Option 2) 1 This option is incorrect. Option 3) 2 This option is incorrect. Option 4) 3 This option is correct.
Medical
239 Views   |   5 months, 2 weeks ago

Which of the following fluoro-compounds is most likely to behave as a Lewis base?

  • Option 1)

    BF3

  • Option 2)

    PF3

  • Option 3)

    CF4

  • Option 4)

    SiF4

 

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P Plabita
Answered 5 months, 1 week ago
  behave like lewis base because it has one pair of electron. Option 1) BF3 this is the incorrect option Option 2) PF3 this is the correct option Option 3) CF4 this is the incorrect option Option 4) SiF4 this is the incorrect option
Medical
111 Views   |   5 months, 2 weeks ago

Natural rubber has:

  • Option 1)

    All cis- onfiguration

  • Option 2)

    All trans-configuration

  • Option 3)

    Alternate cis- and trans-configuration

  • Option 4)

    Random cis- and trans-configuration

 

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A aadil.khan
Answered 5 months, 1 week ago
  Natural Rubber/ cis-1 4-polyisoprene - - It's an addition polymer of isoprene (2-methyl-1, 3-butadiene). - Chains are held together by weak van der waal's interaction. - wherein - Sticky material.     Option 1) All cis- onfiguration Option 2) All trans-configuration Option 3) Alternate cis- and trans-configuration Option 4) Random cis- and trans-configuration
Medical
119 Views   |   5 months, 2 weeks ago

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

  • Option 1)

    Na

  • Option 2)

    K

  • Option 3)

    Rb

  • Option 4)

    Li

 

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P Plabita
Answered 5 months, 2 weeks ago
Li+ being smallest has maximum charge density   Li+ is most heavily hydrated among   Option 1) Na this is the incorrect option Option 2) K this is the incorrect option Option 3) Rb this is the incorrect option Option 4) Li this is the correct option
Medical
531 Views   |   5 months, 2 weeks ago

Which of the following biphenyl is optically active?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

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A aadil.khan
Answered 5 months, 2 weeks ago
As we learnt in Optically active compound - Those compounds having capacity to rotate plane polarised light is called optically active compound. - wherein     This piphenyl is non planar and having absence of plane of symmetry hence it is an optically active compound. Option 1) This option is incorrect Option 2) This option is correct Option 3) This option is correct Option 4) This...
Medical
230 Views   |   5 months, 2 weeks ago

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy \DeltaU of the gas in joules will be :

  • Option 1)

    1136.25 J

  • Option 2)

    -500 J

  • Option 3)

    -505 J

  • Option 4)

    +505 J

 

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S satyajeet
Answered 5 months, 2 weeks ago
Word done, Now, for adiabate process, f=0   Option 1) 1136.25 J This option is incorrect. Option 2) -500 J This option is incorrect. Option 3) -505 J This option is correct. Option 4) +505 J This option is incorrect.
Medical
297 Views   |   5 months, 2 weeks ago

The ionic radii of A+ and B- ions are 0.98 x 10-10 m and 1.81 x 10-10 m. The coordination number of each ion in AB is:

  • Option 1)

    6

  • Option 2)

    4

  • Option 3)

    8

  • Option 4)

    2

 

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S satyajeet
Answered 5 months, 2 weeks ago
As we learned in concept Radius ratio of ions = This radius ratio lies between 0.441-0.732 which gives us the octahedral structure and coordination number 6. Option 1) 6 This option is correct. Option 2) 4 This option is incorrect. Option 3) 8 This option is incorrect. Option 4) 2 This option is incorrect.
Medical
129 Views   |   5 months, 2 weeks ago

The following reaction

is known by the name:

  • Option 1)

    Friedel-Craft's reaction

  • Option 2)

    Perkin's reaction

  • Option 3)

    Acetylation reaction

  • Option 4)

    Schotten-Baumen reaction

 

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V vakul.arora
Answered 5 months, 2 weeks ago
As we learnt , @2433 It is Schatten - Baumen reaction.   Option 1) Friedel-Craft's reaction This is incorrect. Option 2) Perkin's reaction This is incorrect. Option 3) Acetylation reaction This is incorrect. Option 4) Schotten-Baumen reaction This is correct.
Medical
169 Views   |   5 months, 3 weeks ago

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

  • Option 1)

    \Delta G = -2.303 RT log K

  • Option 2)

    \Delta G = 2.303 RT log K

  • Option 3)

    \Delta G^{0} = -2.303 RT log K

  • Option 4)

    \Delta G^{0} = 2.303 RT log K

 

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S SudhirSol
Answered 5 months, 2 weeks ago
As we have learnt, @1682F @1682 Formula Factual Option 1) Option 2) Option 3) Option 4)
Medical
92 Views   |   5 months, 3 weeks ago

If the value of an equilibrium constant for a particular reaction is 1.6 x 1012, then at equilibrium the system will contain:

  • Option 1)

    mostly products.

  • Option 2)

    similar amounts of reactants and products.

  • Option 3)

    all reactants.

  • Option 4)

    mostly reactants.

 

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A Ashutosh
Answered 4 months ago
1  
Medical
60 Views   |   5 months, 3 weeks ago

For the reaction:

X2O4 (l) \rightarrow 2 XO2(g)

\DeltaU = 2.1 k cal, \DeltaS = 20 cal K-1 at 300 K

Hence, \DeltaG is:

  • Option 1)

    2.7 k cal

  • Option 2)

    -2.7 k cal

  • Option 3)

    9.3 k cal

  • Option 4)

    -9.3 k cal

 
Medical
92 Views   |   5 months, 3 weeks ago

The correct thermodynamic condtions for the spotaneous eaction at all temprature is :

  • Option 1)

    \DeltaH < 0 and \DeltaS = 0

  • Option 2)

    \DeltaH > 0 and \DeltaS < 0

  • Option 3)

    \DeltaH < 0 and \DeltaS > 0

  • Option 4)

    \DeltaH < 0 and \DeltaS < 0

 

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S SudhirSol
Answered 5 months, 2 weeks ago
As we have learnt, @1680M @1680More the value of  in the negetive and more the value of  in the positive makes  value higher in negetive, makes the reaction spontaneous Option 1) H < 0 and S = 0 Option 2) H > 0 and S < 0 Option 3) H < 0 and S > 0 Option 4) H < 0 and S < 0
Medical
79 Views   |   5 months, 3 weeks ago

The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is :

  • Option 1)

    - 315 kJ

  • Option 2)

    + 315 kJ

  • Option 3)

    - 630 kJ

  • Option 4)

    - 3.15 kJ

 

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A Ashutosh
Answered 4 months ago
1  
Medical
657 Views   |   6 months, 1 week ago

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

  • Option 1)

    Mg2X

  • Option 2)

    MgX2

  • Option 3)

    Mg2X3

  • Option 4)

    Mg3X2

 

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V vakul.arora
Answered 6 months, 1 week ago
@11129   Mg ion Mg2+  , X = N                                 Nitrogen ion = X3- Option 1) Mg2X Option 2) MgX2 Option 3) Mg2X3 Option 4) Mg3X2
Medical
529 Views   |   6 months, 1 week ago

Consider the following species :

CN+, CN-, NO and CN


Which one of these will have the highest bond order ?

 

  • Option 1)

    CN+

  • Option 2)

    CN-

  • Option 3)

    NO

  • Option 4)

    CN

 

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S subam
Answered 6 months, 1 week ago
As we learnt that @9610 Ion/Species Total electron Bond Order NO 15 2.5 CN- 14 3.0 CN+ 12 2.0 CN 13 2.5   Option 1) CN+ This is incorrect. Option 2) CN- This is correct. Option 3) NO This is incorrect. Option 4) CN This is incorrect.
Medical
438 Views   |   6 months, 1 week ago

Among CaH2, BeH2, BaH2, the order of ionic character is

  • Option 1)

     BeH2 < BaH2 < CaH2

  • Option 2)

    CaH2 < BeH2 < BaH2

  • Option 3)

    BeH2 < CaH2 < BaH2

  • Option 4)

    BaH2 < BeH2 < CaH2

 

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P Plabita
Answered 6 months, 1 week ago
As we learnt that @9567 Smaller the size of cation , more will be its polarising power. Hence BeCl2 will be least ionic.     Option 1)  BeH2 < BaH2 < CaH2 This is incorrect. Option 2) CaH2 < BeH2 < BaH2 This is incorrect. Option 3) BeH2 < CaH2 < BaH2 This is correct. Option 4) BaH2 < BeH2 < CaH2 This is incorrect.
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