CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

E=hv, E=3.13×10^-19 power of lamp=60 watt, E=3.313×10^-19 photons emitted in one second=60×10^19/3.313=1.81×10^20" in 10 hours (1.81×10^20×3600×10)=6.5160×10^24 photons emitted

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What is pv/nrt

Posted by Garima Saroj 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Tushar Kharb 8 years, 2 months ago

Pv/nRT or pv=nRT is an ideal gas equation

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What is the main difference in the origin of cathode rays and anode rays

Posted by Navneet Mishra 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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What is chemical reaction?

Posted by Asiya Asiya 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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How many grams of oxygen are required to complete react with 0.2 gram of hydrogen to yield water . Also calculate the amount of water formed

Posted by Prity Kumari 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Rahul Poddar 8 years, 2 months ago

O2 required 1.6g to react with 0.2g of hydrogen and form 1.8g of water

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What is heteronuclear atom

Posted by Divyanshi Mishra 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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Calculate the no. Of molecules present in a spherical drop of water having a radius of 1mm if density of water is 1g/cm^3

Posted by Abhishek Kullar 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Rahul Poddar 8 years, 2 months ago

4.01947×10^19 molecules of H2O

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MnO4- + I- gives MnO2 + I2 (Basic) How to balance this Redox Reaction????

Posted by Sakshi Nimsatkar 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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Name three metals that do not lose hydrogen when react with acid

Posted by Tannu Rajput 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Rahul Poddar 8 years, 2 months ago

Fe, Cu, Ag

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When 100g of ethylene polymerises to polyethylene acc. to eqn- nCH2=CH2 -> -(-CH2-CH2-)n- The weight of polyethylene produced will be ???????.

Posted by Saurav Bhushan 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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Formula of actual weight ?????

Posted by Saurav Bhushan 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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What is heterolysis of Covalent Bond?

Posted by Naziya Shaikh 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Rahul Poddar 8 years, 2 months ago

Heterolysis of covalent bond is the breaking of covalent bond in which the highly electronegative takes the all shared pair of electrons in bonding and become anionic

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what is hybridisation ?

Posted by Srishti Rachna 8 years, 2 months ago

CBSE > Class 11 > Chemistry

2 answers

Deeksha Vohra 8 years, 2 months ago

Mixing of two different orbitals to form new orbital

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Deeksha Vohra 8 years, 2 months ago

Mixing of two orbitals to form new orbit

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Electrovalency

Posted by Deepanshu Jhanjhariya 8 years, 2 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogesh Rupireddy 8 years, 2 months ago

Ionic not ionut

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Yogesh Rupireddy 8 years, 2 months ago

Valency of element having ionut character

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What is kossel concept

Posted by Sachin Sahu 8 years, 2 months ago

CBSE > Class 11 > Chemistry

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Si unit of viscosity

Posted by Sumit Agarwal 8 years, 2 months ago

CBSE > Class 11 > Chemistry

3 answers

Tushar Sandhu 8 years, 2 months ago

Nm s pa s

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Deepti Choudhary 8 years, 2 months ago

Poise or gram per can second

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Deepti Choudhary 8 years, 2 months ago

Poise Gram per cm second

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11. A student forgot to add the reaction mixture to the round bottomed flask at 27 °C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?

Posted by Ayush Bhagat 8 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

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How to solve numerical in short time

Posted by Sneha Pandey 8 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

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How can we separate if we mix powder of sugar and salt

Posted by Hariom Tiwari 8 years, 2 months ago

CBSE > Class 11 > Chemistry

2 answers

Hariom Tiwari 8 years, 2 months ago

How can we know it is sugar or salt

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Rahul Poddar 8 years, 2 months ago

Use fine pores strainer ( छलनी) it is a physical method

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Explain hybridization XEF2

Posted by Yuvraj Pradhan 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Ayush Meena 8 years, 2 months ago

Sp3d hybridisation

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Which one is better for expressing concentration of solution molarity or molality

Posted by Ananya Sharma 8 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Bharti Devnani 8 years, 2 months ago

Molality is better As in this mass of solvent is considered which is temperature Independent so is molality But in molarity volume is considered which changes with temperature so is molarity.

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What is radioactive elements

Posted by Ananya Sharma 8 years, 2 months ago

CBSE > Class 11 > Chemistry