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

While hydrogen and oxygen combustion produces a significant amount of heat and sustains the fire , the introduction of water vapor can help in extinguishing the fire by absorbing heat, displacing oxygen and actions a barrier. ☺

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How to find normality

Posted by Srishti Thakur 2 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Anupam Yadav 2 years, 2 months ago

what volume of 10 molar hcl and 3 molar hcl should be mined to obtained lime of 6 hcl solution

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What is matter and what are different type of matter based on this

Posted by Prachi Kharanshu 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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Ratan Patwa 1 year, 11 months ago

Anything which is occupied space and his mass.

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Srishti Thakur 2 years, 2 months ago

Matter anything has mass of occupied and space

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Alok Yadav 2 years, 2 months ago

Matter anything has mass of occupied and space

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A mixture of 24 dm^(3) of hydrogen and 100 dm^(3) of oxygen was ignited and the reaction mixture was cooled to room temperature and pressure. What will be the volume of gases remaining at the end of the reaction?

Posted by Mohit Meena 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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Calculate the mass percent of different elements present in sodium sulphate (Na2so4)

Posted by Salchina Sangma Sangma 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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Abhishek Saini 2 years, 2 months ago

140

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Alok Yadav 2 years, 2 months ago

140

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11.11g of urea is dissolved in 100g of water, calculate the molarity and molality of the solution

Posted by Jeewan Chand 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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A potassium iodide aqueous solution is 40% by mass. If the density of solution is 0.4 gm/ml. Calculate morality , molality , mole fraction of each compound

Posted by Khushi Singh 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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How to balanced redox reaction

Posted by Sandeep Jha 2 years, 2 months ago

CBSE > Class 11 > Chemistry

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Suggest questions related about temperature conversion

Posted by Sulekha Maurya 2 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Sulekha Maurya 2 years, 2 months ago

Hhehdhd

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An organic compound contains C = 40% . H = 6.6%if vapour density of the compound is 15 ,find its molecular formula .

Posted by Ragini Ragini 2 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Ragini Ragini 2 years, 2 months ago

Molecular formula=n×Empirical formula N=mol. Wt /mass of EF VD Molecular weight=2×VD =2×15 Molecular weight=30 Total %= [100 -(40+6.66 )]=%of oxygen 100= 100 - 46.66 = 53.34% Atomic mass percent. C. 12. 40 H. 1. 6.66 O. 10. 53.34 At. Ratio. Simple ratio 40\12 =3.33. 3.33\3.33 6.66\1=6.66. 6.66\3.33 53.34\16=3.33 3.33\3.33 C:H:O =1:2:1 Empirical formula=CH2O Mass = 12+(1+2)+16 = 30 N= mol. Wt\mass of EF = 30\30=1 Then, Molecular formula=1×CH²O CH²O

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What is the mass of one mole of electrons.write briefly

Posted by Aryan Kumar 2 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Ayushi Tripathi 2 years, 2 months ago

Mass of one electron is 9.1×10−28gm So mass of one mole of electronis (6.02×1023)×(9.1×10−28) = 0.55×10−3 gm =0.55mg

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35. The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum to which it belongs, respectively are- (1) Lyman, Ultraviolet (2) Lyman, Visible (3) Balmer, Ultravoilet (4) Balmer, Visible

Posted by Sameer Ahmed 2 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Srishti Thakur 2 years, 2 months ago

1 lyman uv rays

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Discovery of radioactivity..

Posted by Nancy Rana 2 years, 3 months ago

CBSE > Class 11 > Chemistry

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Sandeep Jha 2 years, 2 months ago

This is a very better questions but the discovery of radioactivity in 1 March 1896 Henri bacquerel

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Internal questions

Posted by Aмιт Ꭾ𝙰𝙷𝙰𝙳𝙸 2 years, 3 months ago

CBSE > Class 11 > Chemistry

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Which has a higher energy : a photon of red light with wavelength of 7500 A° or a photon of green light with wavelength 5250 A° ?

Posted by Harshika . 2 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Aмιт Ꭾ𝙰𝙷𝙰𝙳𝙸 2 years, 3 months ago

All other light is also wavelength but they are bend away at angle..

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Aмιт Ꭾ𝙰𝙷𝙰𝙳𝙸 2 years, 3 months ago

Because red light have larger wavelength red light is seen from the far..🥺

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What is photoelectric effect.

Posted by Kishanvir Kishanvir 2 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Harshika . 2 years, 3 months ago

Radiation with greater frequency than Vo (minimum frequency) when strike on a metal surface then electon are ejected out of metal surface. This phenomenon is called photoelectric effect

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Why is atomic mass unit define by carbon 12 isotope?

Posted by Biky Das 2 years, 3 months ago

CBSE > Class 11 > Chemistry