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What is the mole fraction of the solute in a 1.00m aqueous solution?

  • Option 1)

    0.177

  • Option 2)

    1.770

  • Option 3)

    0.0354

  • Option 4)

    0.0177

 

As learnt

Mole Fraction -

\dpi{100} Mole\: Fraction= \frac{Moles\: o\! f\: solute}{Moles\: o\! f solute+Moles\: o\! f solvent}

-

 Mole fraction = \frac{moles of salute}{moles \:of \:salute + moles\:of\:solvent}

Let's assume, we have 1 mole of solute

Then, wt. of solvent = 1 kg

Moles of solvent = \frac{1000}{18}\:mol

Mole fraction of solute = \frac{1}{1+\frac{1000}{18}}

                                     = \frac{18}{1018}

                                     = 0.0177


Option 1)

0.177

This option is incorrect

Option 2)

1.770

This option is incorrect

Option 3)

0.0354

This option is incorrect

Option 4)

0.0177

This option is correct

View Full Answer(1)
Posted by

prateek

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

As we learnt in

Nucleophile -

Those e- rich  chemical species having capacity to attack e-deficient portion of substrate.

- wherein

Nucleophile must have complete octet and atleast one lone pair

 

 

Stable due to +I effect of -CH3 group.

 


Option 1)

Incorrect

Option 2)

Correct

Option 3)

Incorrect

Option 4)

Incorrect

View Full Answer(1)
Posted by

subam

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Consider the following compounds  

Hyperconjugation occurs in:

  • Option 1)

    II only

  • Option 2)

    III only

  • Option 3)

    I and III

  • Option 4)

    I only

 

As we learnt in

Hyperconjugation or ?-? resonance or Baker and Nathan effect -

The conjugation between \alpha C-H sigma bond and adjacent  multiple bond or carbocation is called Hyperconjugation.

- wherein

It is permanent effect.

 

 Hyper conjugation can occur only in compound III as it have \alpha-hydrogen atoms. 

 


Option 1)

II only

Incorrect

Option 2)

III only

Correct

Option 3)

I and III

Incorrect

Option 4)

I only

Incorrect

View Full Answer(1)
Posted by

Aadil

Which of the following statements is not correct for a nucleophile?

  • Option 1)

    Nucleophile is a Lewis acid

  • Option 2)

    Ammonia is a nucleophile

  • Option 3)

    Nucleophiles attack on less e- density sites

  • Option 4)

    Nucleophiles are not electron seeking

 

As we learnt in

Nucleophile -

Those e- rich  chemical species having capacity to attack e-deficient portion of substrate.

- wherein

Nucleophile must have complete octet and atleast one lone pair

 

 Nucleophiles are those compounds which has a lone pair of electron . Lewis acid has deficiency of electron. Hence a nucleophile can't be a Lewis acid. 

 


Option 1)

Nucleophile is a Lewis acid

Correct

Option 2)

Ammonia is a nucleophile

Incorrect

Option 3)

Nucleophiles attack on less e- density sites

Incorrect

Option 4)

Nucleophiles are not electron seeking

Incorrect

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Posted by

subam

JEE Main high-scoring chapters and topics

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Given 

  • Option 1)

    I and III

  • Option 2)

    II and III

  • Option 3)

    I, II and III

  • Option 4)

    I and II

 

As we learnt in

Hyperconjugation or ?-? resonance or Baker and Nathan effect -

The conjugation between \alpha C-H sigma bond and adjacent  multiple bond or carbocation is called Hyperconjugation.

- wherein

It is permanent effect.

 

 

 


Option 1)

I and III

Correct

Option 2)

II and III

Incorrect

Option 3)

I, II and III

Incorrect

Option 4)

I and II

Incorrect

View Full Answer(1)
Posted by

subam

The number of structural isomers possible from the molecular formula C3H9N is:

  • Option 1)

    4

  • Option 2)

    5

  • Option 3)

    2

  • Option 4)

    3

 

As we learnt in

Isomerism in nitro compounds -

Nitroalkanes shows chain, position, functional isomerism and Tautomerism.

-

 

 

 


Option 1)

4

Correct

Option 2)

5

Incorrect

Option 3)

2

Incorrect

Option 4)

3

Incorrect

View Full Answer(1)
Posted by

Aadil

NEET 2024 Most scoring concepts

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The electrolytic reduction of nitrobenzene in strongly acidic medium produces:-

  • Option 1)

    Azooxybenzene

  • Option 2)

    Azobenzene

  • Option 3)

    Aniline

  • Option 4)

    p-Aminophenol

 

p-aminophenol

View Full Answer(2)
Posted by

kishorilal

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with:

  • Option 1)

    iron (II) sulphide

  • Option 2)

    carbon monoxide

  • Option 3)

    copper (I) sulphide

  • Option 4)

    sulphur dioxide

 

 

Reduction of Metal Oxide to Metal -

The crude metal is obtained when the roasted ore or calcined ore is put to reduction by using a suitable reducing agent.

- wherein

HgO+HgS\rightarrow 3Hg+SO2

 

 


Option 1)

iron (II) sulphide

Incorrect

Option 2)

carbon monoxide

Incorrect

Option 3)

copper (I) sulphide

Correct

Option 4)

sulphur dioxide

Incorrect

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Posted by

subam

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In which of the following compounds. the C-Cl bond ionisation shall give most stable carbonium ion?

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

 

Order of Nucleophilic Substitution Reaction -

Reactivity Order

3^{\circ}Alkyl\: Halide> 2^{\circ}Alkyl\: Halide> 1^{\circ}Alkyl \: Halide

- wherein

 

Tertiary butyl chloride will give the most stable carbonium ion.


Option 1)

This is correct option

Option 2)

This is incorrect option

Option 3)

This is incorrect option

Option 4)

This is incorrect option

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Posted by

Vakul

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in radius \frac{r}{2} and the lighter one in radius r. The tangential speed of lighter stone is n times that of the  value of heavier stone when they experience same centripetal forces. The value of n is:

  • Option 1)

    3

  • Option 2)

    4

  • Option 3)

    1

  • Option 4)

    2

 

As we discussed in concept

Force in non-uniform Circular Motion -

F_{c}=ma_{c}=frac{mv^{2}}{r}

Ft = mat

F_{net}=msqrt{a_{c}^{2}+a_{t}^{2}}

m = mass

ac= centripetal acceleration

at = tangen tial acceleration

Fc = centripetal force

- wherein

overrightarrow{F_{c}}perpvec{v}

W is not equal to zero by tangential force.

W = 0 by centripetal force

 

 

 \frac{m_{1}v_{1}^{2}}{r}=\frac{mv_{2}^{2}}{(\frac{r}{2})}\:\:\:= V_{1}^{2}=4V_{2}^{2}

 

V_{1}=2V_{2}

i.e n=2

 


Option 1)

3

This option is incorrect.

Option 2)

4

This option is incorrect.

Option 3)

1

This option is incorrect.

Option 4)

2

This option is correct.

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Posted by

Plabita

JEE Main high-scoring chapters and topics

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