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Rosance structure of electrophilic subsitution reaction

Posted by Aashish Mishra 7 years, 7 months ago

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Sodium crystallises in bbc unit cell.what is approximate number of unit cell is 4.6 of sodium?Give that the atomic mass of sodium is 23 g mol-1.

Posted by Amit Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Saloni S 7 years, 7 months ago

what is 4.6.please write the ques.accurately

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Silver crystallises in fcc lattice. If edge length of cell is 4.07multiply by 10 to power -8cm and density is 10.5 gram/cm cube ,calculate the atomic mass of silver.

Posted by Ayush Jaiswal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Saloni S 7 years, 7 months ago

Z=4 a=4.07×10^-8 cm d=10.5g/cm d=Z×M/a^3×N so after putting the values M=106.59g/mol

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Given that the temperature coefficient for saponification of ethyl acetate by NaOH is 1.75. Calculate the activation energy of the reaction ?

Posted by Ashish Hembrom 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Under what condition molarity and molality of a solution remains identical?

Posted by Neha Gupta 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Beck 7 years, 7 months ago

Molality is defined as the no. of moles of solute per kilogram of solvent. Because the density of water at 25°C is around 1kg/litre thus the molality is approximately equal to molarity for dilute aqueous solutions at this temperature.

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Write the chemical rxn involved inthe process of extraction of gold. Explain the role of dilute NaCN and Zn in this process

Posted by Inder Takuli 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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I failed in chem but pass in hindi（additional sub） so i decleared pass. can i give compart for chem in this year ？

Posted by Sujeet Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Saloni S 7 years, 7 months ago

yes

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Define rate of a reaction?

Posted by Suryaday Roy 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Madiha Abbasi 7 years, 7 months ago

It is defined as the change in concentration of reactant (or product) in unit time.

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What is the difference between E° and E in electrochemistry

Posted by Saurav Gupta 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Neetesh Kumar 7 years, 7 months ago

E° is difference in the potential of electrode and its 1 molar electrolyte at STP And E is difference in the potential of electrode and its electrolyte is called electrode potential.

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Previous improvement question

Posted by Ranjan Yadav 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Ncert is sufficient for. Cbse board exam comparison to Nootan or Modern abc

Posted by Virendra Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Sohail Khan 7 years, 7 months ago

Topics of ncert are enough but u need to refer for them in modern bcz a single word from ncert can come i 5 mark in exam . So collect more about every word than ncert

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When a certain conductance cell was filled with 0.1M KCI it has a resistance of 85

Posted by Bajrang Bahadur Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry