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NANDANI KUMARI • asked a question

Following reactions occur at cathode during the electrolysis of aqueous copper (II) chloride solution:

Cu2+(aq) + 2 e-2 ———–> Cu(s) E = + 0.34 V

H+(aq) + e-1 ————-> 1/2H2(g) E = 0.00 V

On the...

SinceECu2+/CuECu2+/Cuhas a greater positive value thanEH+/HEH+/H, the reaction that is feasible at the cathode is

Cu2+(aq)+2eCu(s)

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Shrajesh thapa • asked a question

1.     How many beats can be heard by sounding together two tuning forks of frequencies 250Hz and 256Hz?

Number of beats (n) =f2- f1

= 256 - 250

= 6 beats /sec

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NANDANI KUMARI • asked a question

Answer the following:

 (i) Transition elements form interstitial compounds.

(ii) Mns+(3d4) is strongly oxidising, whereas Cr2+(3d4) is strongly reducing.

(iii) Transition metals have high melting...

II)Cr2+ is reducing agent as its configuration changes from d4 to d3, when it is oxidized to Cr3+ .The d3 configuration have a half-filled t2g level which is very stable. On the other hand, the reduction of Mn3+ to Mn2+ results in the half-filled (d5) configuration which has extra stability hence Mn3+ acts as oxidizing agent.
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LOKESH DAS • almost 2 years ago

Here are some bonny dialogues fromWonder,a wonderful novelby R.J. Palacio. I admire the last one (fav)

Funny how sometimes you worry a lot about something and it turns to be nothing.(page 215)

It was like when you re in a room where one of the lightbulbs on the ceiling isn't working,but you dont realize how dark it is until until someone changes the bulb and then you are like whoa, it s so bright in here.(page -214)

I think there should...

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Bijaya Rajbhandari • asked a question

Why did Aksionov think of killing himself?

Asksionov thought of killing himself because he remembered all those harsh situations that he had faced in his life without committing any crime . Even his wife didn't  believe in him . He got frustrated by thinking all these painful situations that he was ready to kill himself.

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NANDANI KUMARI • asked a question

How would you account for the following:

(i) Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O2

(ii) Transition metals and their compounds show catalytic properties.

ii)Transition metals and their compounds show catalytic activities because of Variable or multiple oxidation states, ability to form complexes, they provide large surface area for adsorption.
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Bijaya Rajbhandari • asked a question

Which symbols are used in the story and what do they indicate?

the symbols used in the story are:

  1. house and shops- it symbolizes Aksionov's family and material possessions
  2. nightmare-it symbolizes a bad omen.
  3. blood-stained knife- it indicates Aksionov's lack of control over his fate.
  4. the prison- Aksionov's pain and subsequent mystical transformation are symbolized by the prison.
  5. the book(the lives of the saints)- gives an impression of religiosity.
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