Ask questions which are clear, concise and easy to understand.

Please Wait.. Editor is Loading..
Why phenoxide ion is more stable than phenol?
  • 1 answers

Pragati Gola an hour ago

Phenoxide ion undergoes resonace
Calculate the mass percentage of benzene C6H6 and carbon tetrachloride if 22g of benzene is dissolved in 122g of carbon tetrachloride
  • 2 answers
Mass of solution = 22+122=144 now, to calculate mass % of c6h6=22/144*100%=15.278% and mass % of ccl4=122/144*100%=84.72%

Sia 🤖 11 hours ago

Mass of solution = Mass of benzene (C6H6) + Mass of CCl4
= 22 g + 122 g = 144 g
Mass percentage of {tex}{C_6}{H_6} = \frac{{{\text{Mass of benzene}}}}{{{\text{Mass of solution}}}} \times 100{/tex}
{tex} = \frac{{22g}}{{144g}} \times 100{/tex} = 15.28%
Mass percentage of {tex}CC{l_4} = \frac{{122g}}{{144g}} \times 100{/tex} = 84.72% or 100-15.28 = 84.72%

What is molarity.
  • 6 answers

Ayush Rajpoot 5 hours ago

Molarity is defined as the no. Of moles of solute dissolved in one litre of solution
Number of moles per unit volume

Hritik Kumar 8 hours ago

No of moles of the solute to the volume in litre

Deepak Jindal 11 hours ago


Deepak Jindal 11 hours ago

It is defined as the no. of moles of solute to the volume of solution in 1 litre✌✌🤔🤔

Sia 🤖 12 hours ago

Molarity describes the number of moles of the substance per liter of liquid. In chemistry, a mole is a unit of measurement for a chemical substance. The scientific noun molarity describes the concentration of a substance as measured by the number of moles divided by the volume of the solution it's in.
How to make a model based on electrolysis
  • 1 answers

Sia 🤖 16 hours ago
Write short notes on alltrophes of phosphorus
  • 2 answers

Yogita Ingle 14 hours ago

The main allotropes of phosphorus include the white phosphorus, red phosphorus and black phosphorus. In addition to these, there also exists a violet phosphorus. However, that is not a significant allotrope.

Sia 🤖 16 hours ago

Elemental phosphorus can exist in several allotropes, the most common of which are white and red solids. Solid violet and black allotropes are also known. Gaseous phosphorus exists as diphosphorus and atomic phosphorus.
Why cu2+ is more stable in aqueous solution
  • 1 answers

Sia 🤖 16 hours ago

It is because hydration energy of Cu2+ ion is high compared to Cu+ ion. The high hydration energy of Cu2+ can overcome second ionization energy of Cu2+ .That is why Cu2+ is more stable than Cu+ ion in aqueous solution.

Why mercury cell gives constant potential throughout its life?
  • 1 answers

Deepika Baralu 1 day, 5 hours ago

If you came to know plzz tell me
Calculate Molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene .
  • 2 answers
Molality of ethanoic acid =2.5/60*1000/75=0.5556

Praveen Singh 1 day, 8 hours ago

Mass of solute=2.5g Mass of solvent=75g Molar mass of solute=2C+4H+2O =12*2+4*1+2*16 =24+4+32 =60g Moles of solute=2.5/60 =0.042mol Molality=number of moles of solute/mass of solvent in kg m=0.042*1000/75 =0.56mol/Kg
Carbon tetrachloride and water are immiscible while Ethyl alcohol and water are miscible in all properties. Correlate the above behavior with structural nature of molecules of these compounds
  • 2 answers

Rajveer Kaur 8 hours ago

Thank you

Prashant Tomar 1 day, 7 hours ago

CCl4 is non polar while H2O is polar.polar solvent dissolves polar solute so CCl4 is immiscble in H2O .While C2H5OH is miscible in H2O due to presence of hydrogen bonds between C2H5OH and H2O.
What is lampblack?
  • 3 answers

Deepak Jindal 1 day, 8 hours ago

Black pigment made from the soot

Yogita Ingle 1 day, 13 hours ago

Lamp Black is fabricated when tar and vegetable oils (rich in carbon) are singed in a deficient supply of air and the subsequent residue is deposited on wet blankets in a room.
Lamp Black is a velvety black powder. It is utilized as a part of the preparation of Indian ink, carbon papers, printer's ink, varnishes, and black paint.

Sia 🤖 1 day, 13 hours ago

a black pigment made from soot
Investigatory project topics class 12
  • 1 answers

Sia 🤖 1 day, 16 hours ago

Invisible Ink : Modeling A Molecular Switch
Absorbing Ammonia
Effect of Acid Rain on Limestone Rock
Amount of Casein in Milk
Finding EMF of Electrochemical Cell
That’s Some Smart Metal
Silver is uniformly electroposited on a metallic vessel of surface area of 900 cm² by passing a current of 0.5A for 2 hours. What is the thickness of silver deposited if density of silver 10.5 g/cm³
  • 1 answers

Sia 🤖 1 day, 14 hours ago

We have, mass(m) deposited is
{tex}m = Z \times I \times t{/tex}
{tex}m = \frac{{108}}{{96500}} \times 0.5 \times 2 \times 60 \times 60{/tex}
{tex} = \frac{{108 \times 5}}{{965 \times 10}} \times 2 \times 6 \times 6{/tex}= 4.03 g
{tex}4.03g = V \times d{/tex}
{tex}4.03g = V \times 10.5gc{m^{ - 3}}{/tex}
V = Area {tex} \times {/tex} Thickness
{tex}V = \frac{{4.03}}{{10.5}}{/tex}
{tex}\frac{{4.03}}{{10.5}} = 900c{m^2} \times {/tex} thickness
Thickness {tex} = \frac{{0.338c{m^3}}}{{900c{m^2}}}{/tex}
{tex} = 4.26 \times {10^{ - 4}}cm{/tex}

What js the formula of flux
  • 1 answers

Sia 🤖 1 day, 14 hours ago

{tex}\Phi _ { B } = B \cdot A{/tex}
{tex}\Phi _ { B } = B A \operatorname { Cos } \theta{/tex}
Where, B = magnetic field
 A = surface area and
{tex}\theta{/tex} = angle between the normal to the surface and magnetic field.

What book I will refer for chemistry
  • 8 answers

Deepak Jindal 1 day, 20 hours ago


Jyoti Saroj 2 days, 5 hours ago

morden ABC

Prince Yadav 2 days, 5 hours ago

First finish ncert with numericals because ncert is best book

K@Lp@N@ Singh 2 days, 6 hours ago

First you must complete NCERT and read thoroughly as many time possible. Solve NCERT questions as many times.

Gourav Neemroat 2 days, 7 hours ago

Op tondon

Bhavya Tiwari 2 days, 7 hours ago

Balaji publication

Mahavir Jaat 2 days, 7 hours ago

Pradeep publications

Mithlesh Prajapati 2 days, 7 hours ago

Op tondon
What will be the degree of disoociation of 0.1 M Mg(No3) 2 solution if vant hoff factor is 2.74?
  • 1 answers

Sia 🤖 1 day, 14 hours ago

{tex}M g \left( N O _ { 3 } \right) _ { 2 } \rightarrow M g ^ { 2 + } + 2 N O _ { 3 } {/tex}
{tex}\alpha = \frac { i - 1 } { n - 1 }{/tex}
{tex}= \frac { 2.74 - 1 } { 3 - 1 }{/tex}
{tex}= \frac { 1.74 } { 2 }{/tex}
= 0.87
Degree of Dissociation = 0.87 {tex}\times{/tex}100 = 87%

Write two advantage of H2 O2 fuel cell over ordinary cell
  • 3 answers

Bhavya Tiwari 2 days, 8 hours ago

1st is high efficiency over ordinary cell and 2nd is fuel cell don't escape any exhaust and 3rd one is h2o produced by this ,used by astronauts for drinking purpose.

Bhavya Tiwari 2 days, 8 hours ago

High efficiency over ordinary cell Fuel cell has 2 electrode 1 positive and 1negative (cathode ,anode)

Guri Lubana 2 days, 12 hours ago

Pata nhi
What is formula of heavy water
  • 5 answers

Hritik Kumar 2 days, 9 hours ago


Deepak Jindal 2 days, 12 hours ago


Rajesh Kumar 2 days, 13 hours ago

It is D2O

Bhavya Tiwari 2 days, 16 hours ago

It's D2O

Shashank Mishra 2 days, 16 hours ago


Buy Complete Study Pack

Subscribe complete study pack and get unlimited access to selected subjects. Effective cost is only ₹ 12.5/- per subject per month. Based on the latest CBSE & NCERT syllabus.

CBSE Guide App

Install myCBSEguide mobile app for FREE sample papers, Test Papers, Revision Notes, Previous year question papers, NCERT solutions and MCQ tests

myCBSEguide App

CBSE Test Generator

Create papers in minutes

Print with your name & Logo

Download as PDF

3 Lakhs+ Questions

Solutions Included

Based on CBSE Blueprint

Best fit for Schools & Tutors

Work from Home

  • Work from home with us
  • Create questions or review them from home

No software required, no contract to sign. Simply apply as teacher, take eligibility test and start working with us. Required desktop or laptop with internet connection