The Unconditional Guru

The Unconditional Guru

exact answers only

  • Home
  • The Organic Chemistry
  • Selective Science Notes
    • Selective notes for class 10th
    • Selective notes for class 9th
  • Free Text book Solutions
    • Class 10
    • Class 9
    • Class 8
    • Class 7
    • Class 6
  • Contact
  • Chemistry
    • Science Blog
    • Chemistry blog
  • Blog
Show search form Menu
Hide search form
February 2, 2022April 26, 2022

Benzene is soluble in toluene but not in water . Why ?

No comments
December 31, 2021

A new beginning… 2022

2 comments
December 31, 2021December 31, 2021

How is it that alcohol and water are miscible in all proportions ?

No comments
December 31, 2021

Which of the 3-d series of the transition metals exhibit the largest number of oxidation states and why ?

No comments
chemistry

Explain the term ‘Mole fraction’ .

By ankushmaster on July 3, 2022

It the ratio of number of moles of a perticular component to the total number of moles of components present in the mixture .

No comments
chemistry

How does the molarity of solution changes with change in temperature ?

By ankushmaster on July 3, 2022

With change in temperature the volume of solvent increases ,due to this the molarity of the solution decreases.

No comments
chemistry

Why is molality is preferred over molarity if the solution ?

By ankushmaster on July 3, 2022

Molarity : It decreases with increase in temperature. Molality : It remains constant . Doesn’t change. In the light of above points it is clear that any change in temperature can bring change in concentration of the solution.

No comments
chemistry

Why does the molality remains unchanged unaffected with change in temperature ?

By ankushmaster on July 3, 2022July 3, 2022

Because the mass do not vary with change in temperature. It remains the same.

No comments
chemistry

Which concentration term remains unaffected by temperature ?

By ankushmaster on July 3, 2022

Molality remains unaffected with any change in temperature. This is due to the fact that it uses the mass of solvent in Kilograms instead of volume in litres.

No comments
chemistry

NaCl is soluble in water but not in benzene . Why ?

By ankushmaster on July 3, 2022

Benzene is a non polar solvent and salt is polar in nature . Thus it is not soluble in benzene , whereas in case of water , water and salt both are polar in nature so it is soluble in water.

No comments
chemistry

How is that alcohol and water are miscible in all proportions ?

By ankushmaster on July 3, 2022

It is because of the fact that the water and alcohol are polar in nature . Moreover they make Hydrogen bonds, which are a type of weak attraction which facilitates their mixing in all proportions. The following diagram depicts that :-

No comments
chemistry

Oil and water don’t mix . why ?

By ankushmaster on July 3, 2022

It can be explained on the basis of simple fact that like dissolves like. Oil is non polar liquid where as water is polar liquid so these do not mix.

No comments
chemistry

Is smoke a homogeneous solution ?

By ankushmaster on July 3, 2022

No , smoke is not a homogeneous solution . as the particle size of dispersed phase is larger it belongs to the colloidal mixture.

No comments
chemistry

What is the formula of DDT and what are its uses ?

By ankushmaster on July 1, 2022

Dichlorodiphenyltrichloroethane is an insecticide. It is banned in various countries . It is useful in killing various insects especially malaria causing mosquito.

No comments
chemistry

Explain why grignard reagents should be prepared under anhydrous conditions ?

By ankushmaster on May 5, 2022

These are prepared under anhydrous conditions as they easily react with water to give following reaction :-

No comments
chemistry

Explain why alkyl halides , though polar , are immiscible with water?

By ankushmaster on May 5, 2022

The alkyl halides are polar in nature , but the molecules in them are strongly held by the hydrogen bonds formed between H and X (halide = F, Cl, Br atoms). these bonds are not easily broken, a lot of energy is required to break this interaction. Even the heat released at the time of

Continue reading
No comments
chemistry

Explain why the dipole moment of chlorobenzene is lower than cyclohexyl chloride ?

By ankushmaster on May 5, 2022

There are two major aspects that can explain this :- The C-Cl bond in case of chlorobenzene is having some double bond like character , which is indicated by its shorter bond length. thus it indicates the back-flow of electrons from the Chlorine to the Carbon. Thus the polarity decreases and it shows non polar

Continue reading
No comments
chemistry

what are ambident nucleophiles ?

By ankushmaster on May 5, 2022

The nucleophiles which can attack from more than one sides (sites) or which have more than one elecron rich sites are called ambident nucleophiles .

No comments
chemistry

Why are pantahalides more covalent than trihalides?

By ankushmaster on April 26, 2022

It can be easily learned by Fazan’s rule that ion with more charge/radius ratio has more polarizing power. Now in case of pentahalides +5 , the charge/radius ratio is higher than +3, thus pentahalides have more polarizing power , thus it shows covalent character.

No comments
chemistry

What is meant by elementary step in a reaction ?

By ankushmaster on April 26, 2022April 26, 2022

There are certain reactions that complete in a series of small steps , each complementary step is called an elementary step . and such reaction is called a complex reaction.

No comments
chemistry

How does the value of rate constant vary with reaction concentration ?

By ankushmaster on April 26, 2022April 26, 2022

the rate constant is a constant term , whose value does not change with change in concentration . thus the value of k doesn’t change.

Posted in: chemistry
No comments
chemistry

How the alkaline medium prevents the rusting of iron ?

By ankushmaster on April 24, 2022April 26, 2022

The Rate of rusting of iron depends upon the availability of H+ ions , more the ions more will be the rusting. But if we provide the alkaline medium  , it will decrease the concentration of H+ ions. Thus the iron will not be oxidized from Fe to Fe2+ .

No comments
chemistry

Why Aluminium metal cannot be produced by the electrolysis of aqueous solution of aluminium salt ?

By ankushmaster on April 24, 2022April 26, 2022

The discharge potential of Al3+  ion is higher than that of H+ , thus if we are using the aqueous solution of aluminium salt the hydronium ions are preferably discharged giving H2 gas at cathode and Al will remain in the solution. Thus we can not get Aluminium metal by electrolysis.

No comments
chemistry

Why rusting of iron is more in saline water than that of normal water ?

By ankushmaster on April 24, 2022April 26, 2022

Rusting of iron is an electrochemical process , the presence of any ion facilitates the formation of rust. In saline water the presence of Na+ and Cl– ions increase the conductivity of the top layer of the iron , forming the Fe2+ ions . Thus the formation of Fe2O3 X H2O takes place quickly.

No comments
chemistry

Arrange the following metals in order in which they displace each other from the solutions of their salts. Al, Cu, Fe, Mg and Zn.

By ankushmaster on April 24, 2022April 26, 2022

A metal with lower electrode potential can easily displace the metal with higher electrode potential from its salt solution . here are the metals arranged in their increasing order :- Mg , Al , Zn , Fe , Cu

No comments
chemistry

What is the potential of S.H.E Standard hydrogen electrode ?

By ankushmaster on April 24, 2022April 26, 2022

Zero Pt , H2 1(atm) / H+  (1M) ; E0 = 0

No comments
chemistry

What do you mean by standard hydrogen electrode (S.H.E) ?

By ankushmaster on April 24, 2022April 26, 2022

Standard hydrogen electrode is the hydrogen electrode whose electrode potential is zero. half cell equation for this is as given below :- Pt , H2 1(atm) / H+  (1M) ; E0 = 0

No comments

Posts navigation

Page 1 Page 2 … Page 24 Next

search here

Top Posts & Pages

  • Why CH3 group is Ortho and para directing in nature in Toulene ?
  • Stobbe reaction and its Mechanism
Advertisements

Translate

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 572 other followers

Follow The Unconditional Guru on WordPress.com
Advertisements
To top
Advertisements
Advertisements
Advertisements
Advertisements
Advertisements
Create a website or blog at WordPress.com
  • Follow Following
    • The Unconditional Guru
    • Join 572 other followers
    • Already have a WordPress.com account? Log in now.
    • The Unconditional Guru
    • Customize
    • Follow Following
    • Sign up
    • Log in
    • Report this content
    • View site in Reader
    • Manage subscriptions
    • Collapse this bar
 

Loading Comments...