200 - Chemistry Questions Answers

what is difference between dissociatio and ionisation?

Asked By: ANUJ KUMAR YADAV
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Joshi sir comment

Dissociation is the reaction in which two or more than two product molecules are formed.

ex.                  PCl5   --->     PCl3  +  Cl2

whereas ionisation is the reaction in which ions are formed 

ex.               MgCl2  ---->    Mg++   +  2 Cl-

what is kholarsh law ?

 

Asked By: VIKRANT KUMAR
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Joshi sir comment

According to the law, the total molar conductance of a solution will be the sum of ionic conductance of the anion and cation of the electolyte

for example molar condutance of NaCl solution = λNa+  +   λCl-

Lanthanide contraction
Asked By: MOHD NASEEM
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Joshi sir comment

Lanthanide contraction is based on the poor shilding effect of f orbital electrons. Due to this unexpected contraction in size on moving down in a group occurs 

tricks to solve ques of d block elements
Asked By: MOHD NASEEM
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Joshi sir comment

Periodic properties do not follow the general trend in d block so there is no short cut 

Read the complete lesson carefully in details and make a list for all the exceptions  then try the objective questions with a book having no error. At the end of every 10 days revise these notes

At the next revison you will feel more comfort .

  what will be the value of molar conductance for 0.001M aqueoussolution for NH3 ? giveen  k =1.6*10-5  and  equivalent conductance=0.0238

 

Asked By: SHUBHAM VED
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Joshi sir comment

NH+ H+(aq) = NH4

0.001                   0                                 at start

0.001(1-α)          0.001α                       at eq.

now k = 0.001α / 0.001(1-α)

solve this equation for α and getconcentration of NH4+

then use the formula molar conductance = eq. conductance / concentration of NH4+

What is basicity of oxalic acid ?

Asked By: ASHISH RANA
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Joshi sir comment

oxalic acid is COOH-COOH so basicity will be 2

starting from benzene

1. 1,2,4 tribromo benzene

2. ortho crisol

3. ortho hydroxy toluene

4. ortho carboxyl toluene

5. m-bromo phenol

Asked By: LOKHESH
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Joshi sir comment

1)  First prepare aniline from benzene via nitro track, it is ortho para director so by bromination 2,4 dibromo aniline will be formed then change NH2 to Br via diazonium track.

2)  First prepare toluene from benzene, then place NHin ortho position and change it into OH via diazonium track.

3)  same as 2.

4)  First prepare toluene from benzene, then place Br in ortho position and change it into COOH via grignard track.

5)  First prepare nitro benzene, it is meta director so form m- bromo nitro benzene, then change nitro to amino and amino to OH via diazonium track. 

which  has smaallest bond length 1.[V(CO)6]- 2.[Mn(CO)6]+ 3.[Cr(CO)6] 3. Fe(CO)5

Asked By: SAHILKUMAR
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Joshi sir comment

2.[Mn(CO)6]+

[V(CO)6]- will be longest

[fe{phen}3]+2 is it dia magnetic

 

Asked By: SAHILKUMAR
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Joshi sir comment

since phen is a strong-field, chelating nitrogen heterocycle so it will force Fe (ii) into a low-spin  t2g6  eg0 electronic configuration with no unpaired electrons so it is diamagnetic

The nitrogen oxide(s) that contain(s) N-N bond(s) is (are) -
(A) N2O (B) N2O3
(C) N2O4 (D) N2O5

Asked By: KAMAL
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Joshi sir comment

(A) N2O      (B) N2O3       (C) N2O4   
These 3 contains N-N bond but in    (D) N2O5    There is 1 oxygen atom between 2 NO2 so this does not contain N-N bond

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