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  • 0 answers
Best refrence book for prepration
  • 2 answers

Ashish Choudhary 1 day, 15 hours ago

S chand

Farhat Shaikh Shaikh 1 day, 18 hours ago

For me its Pradeep and schand
No. Of electrons in 2.8 g ethene is
  • 1 answers

Akanksha Thakur 1 day, 16 hours ago

Molar mass of C2H4 (ethene) = 2×12+4×1 = 28 g Moles of ethene = Given mass / Molar mass =2.8g/28g mol^-1 =0.1 mol 1 mole = 6.022 × 10^23 atoms 0.1 mole = (6.022 ×10^23 atoms/1 mole)× 0.1 mole = 6.022 ×10^22 atoms 1 atom of C2H4 has electrons = 10 6.022×10^22 atoms of C2H4 have electrons = 6.022 ×10^22 ×10 = 6.022 ×10^22 electrons
Limiting regent
  • 2 answers

Shweta Dhama...👑 1 day, 15 hours ago

Limiting regent is define as the reactants which consumed first limits the amount of product formed.....

Preeti Rahi 1 day, 22 hours ago

It is the element which is present in lesser amount than required
30.00 how much significant figure are there? 3 or 4?
  • 3 answers

Bhole Nath 1 day, 22 hours ago

There are for significant figure

Aditi Virmani 2 days ago

How 3 why nt 4?

Paulo Dybala 2 days, 1 hour ago

For n=3 , l=2, ml=-1,-2,0,1,2 I'm which orbital it lie
  • 2 answers

Akanksha Thakur 1 day, 16 hours ago

It could be written as - 3d^10

Akanksha Thakur 1 day, 16 hours ago

It lies in d orbital
What is quantum numberd
  • 1 answers

Yogita Ingle 2 days, 20 hours ago

Quantum numbers: Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.
Four quantum numbers are used to define the state of an electron completely, namely principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.

Basic difference between ACCURACY AND PRECISION?
  • 2 answers

Rohit Dabas 2 days, 14 hours ago

Well suppose an experiment is conducted and observations are noted down. Now acuarry means that how correct the observation is to the true value,but precision means how close the observation is to each other.HOPE YOU LIKE THIS BASIC DIFFERENCE.

Yogita Ingle 2 days, 21 hours ago

   Basis          Accuracy        Precision
Definition It could be defined as the level of correctness of a measurement to its true value. It could be defined as the sharp exactness of a measurement.
Measurement Method Has one factor used for measuring. Has multiple factors for measurement.
Mutual  Relationship Accurate items have to be precise in most cases. Precise items may or may not be accurate.
Is quanta same as photon??? Or photons and quanta are equal??
  • 4 answers

Allan Krish 3 days, 11 hours ago

Quanta and photon both are same but when we talk about energy then we use photon for sun light

Nisha Solanki 3 days, 13 hours ago

Yes they are same.. Quanta term was given by Albert Einstein

Kunal Sharma 3 days, 14 hours ago

A quanta is a particle of E.M. Radiation but a photon is a special type of quanta particle which is the small pocket of energy of visible light.

Sia 🤖 3 days, 23 hours ago

One quantum of electromagnetic energy is called a photon. The plural of quantum is quanta. The concept of photons and quanta comes from quantum mechanics and quantum theory.
What is the difference btw 2.0g and 2.00g mass and which is more precise mass
  • 2 answers

Preeti Rahi 1 day, 22 hours ago

2.00 is more precise as it tells mass upto 2 decimal places

Medhya Mittal 4 days, 5 hours ago

2.00 is the more precise mass
Why is there use of spin quantam number ? I am asking this question bcz it doest not tell actual position of electron🤔🤔🤔🤔🤔🤔 Plz help me i cant find its reason🤗🤗🤗
  • 1 answers

Sia 🤖 4 days, 20 hours ago

The Spin Quantum Number (ms) describes the angular momentum of an electron. An electron spins around an axis and has both angular momentum and orbital angular momentum. Therefore the first electron in an orbital will have a spin of +1/2. After all the orbitals are half filled, the electrons start to pair up.

A 5 percent aqueous solution of cane sugar has a freezing point of 271 Kelvin .Calculate the freezing point of 5 percent aqueous solution of glucose. Given that freezing point of water is 273.15 kelvin
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Sia 🤖 4 days, 21 hours ago

Given,5% sugar solution means, {tex}w_B{/tex} = 5g
{tex}{w_A} = 95g,\,{M_B} = 342g\,mo{l^{ - 1}}{/tex}
Similarly, for 5% glucose solution, {tex}{w_B}(glu\cos e) = 5g{/tex}
{tex}{w_A} = 95\,g\,and {M_B}(glu\cos e) = 180\,g\,mo{l^{ - 1}}{/tex}
{tex}\Delta {T_f}(cane\,sugar) = \,273.15K - 271K = 2.15K{/tex}
{tex}\Delta {T_f} = \frac{{{K_f} \times {w_B} \times 1000}}{{{M_B}{w_A}}}{/tex}
{tex}2.15 = \frac{{{K_f} \times 5 \times 1000}}{{342 \times 95}}{/tex}
{tex}{k_f} = \frac{{2.15 \times 342 \times 95}}{{5 \times 1000}} = 13.9707{/tex}
similarly, for glucose
{tex}\Delta {T_f}(glu\cos e) = \frac{{13.9707 \times 5 \times 1000}}{{180 \times 95}}{/tex}
{tex}\Delta {T_f} = 4.085K{/tex}
Freezing point of the solution
= 273.15K - 4.085K = 269.065 K

What is eistein equation?
  • 2 answers

Priya Lvk 5 days, 11 hours ago

Einstein equation is E=mc^2

Yogita Ingle 5 days, 23 hours ago

The Einstein Field Equation (EFE) are also known as Einstein’s equation. There are the set of ten equations extracted from Albert Einstein’s General Theory of Relativity. The EFE describes basic interaction of gravitation. The equations were first published in 1915 by Albert Einstein as a tensor equation.

What is exception of metal,non metal or metalloid?
  • 2 answers

Yogita Ingle 5 days, 21 hours ago


Metals are usually solid but mercury is metal which is a liquid.

According to the properties of metals, metals are hard but sodium and potassium is so soft that it can be cut with a knife.


Graphite is a nonmetal that can conduct electricity. (We generally know that nonmetals are insulators)

how many moles of sulphur will be produced when 2 moles of H2S reacts with 11.2 of SO2 at N.T.P
  • 1 answers

Sia 🤖 3 days, 20 hours ago

This is a simple question of Limiting Reagent.
Here is the balanced Equation : 2H2S +SO2 {tex}\rightarrow{/tex} 2H2O + 3S
Thus if 2 moles of H2S reacts with 1 mol of SO2 then 3 moles of S will be formed
But in the given condition, SO2 is only half mole (11.2 L of gas at STP represents half mole), thus it is limiting Reagent.
Thus if 1 mol of SO2 gives 3 moles of sulfur, then 0.5 Moles of it will give 1.5 moles of sulfur.

What is form chemicals
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How co2 is formed?
  • 1 answers
When combination reaction between C and O2 takes place
Is hydrogen a metal or a non metal or a metalloid
  • 4 answers

Satyam Krishna 6 days, 4 hours ago

Non metal (exception)
Not be cleared till now by chemists but it is determined as non metal now

Anshi Chaudhary 6 days, 19 hours ago

It is non metal

Priya Tanwar 6 days, 20 hours ago

Hydrogen is a gas. So it is non -metal.

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