Class 11th
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New answer posted
3 months agoContributor-Level 10
An Atom has three fundamental particles-electron, proton and neutron. The mass of the electron is 9.10939 * 10? ³¹ kg. Neutrons and protons, both are collectively known as nucleons. All the isotopes of a given element show same chemical properties. Dalton's atomic theory, regarded atom as an ultimate particle of matter.
New answer posted
3 months agoContributor-Level 10
20 g of 20% CaCO? = 20 * (20/100) = 4 g CaCO?
CaCO? (100 g) - (1200 K)-> CaO + CO? (44 g)
According to the reaction,
100 g of CaCO? → 44 g of CO?
4 g CaCO? → (4*44)/100 g of CO?
= 1.76 g of CO?
New answer posted
3 months agoContributor-Level 10
ln K = ln A – (E? /R) (1/T)
In ln K v/s 1/T graph
Slope = –E? /R
–5 * 10³ = –E? /8.314
E? = 5 * 10³ * 8.314
= 41500 J mol? ¹ or 41.5 kJ mol? ¹
New answer posted
3 months agoContributor-Level 10
For irreversible expansion of an ideal gas under isothermal condition
ΔU = 0, ΔS (Total) ≠ 0
New answer posted
3 months agoContributor-Level 10
n (B) = 3/2
n (B) = 3, n (O) = 2
n (Total) = 3 + 2 = 5
X (B) = n (B) / n (T) = 3/5
X (O) = n (O) / n (T) = 2/5
P (S) = P° (B)X (B) + P° (O)X (O)
P (S) = 280 * (3/5) + 420 * (2/5)
= 336 mm of Hg
New answer posted
3 months agoContributor-Level 10
Total no. of e?
? Fe → 3d?4s², Fe? ² → 3d? 24
? Mn → 3d?4s², Mn? ² → 3d? 23
New answer posted
3 months ago
Contributor-Level 10
| List-I | | List-II |
| :- | :- | :- |
| (a) 2SO? (g) + O? (g) → 2SO? (g) | (iv) | Tropospheric pollution |
| (b) HOCl (g) - (hν)->? H +? l | (iii) | Ozone depletion |
| (c) CaCO? + H? SO? → | (i) CaSO? + H? O + CO? | Acid rain |
| (d) NO? (g) - (hν)-> NO (g) + O (g) | (ii) | Smog |
New answer posted
3 months agoContributor-Level 10
Dihedral angle (D.A.) of least stable conformer of ethane = 0°
D.A. = 0°
(Eclipsed)
New answer posted
3 months agoContributor-Level 10
Aluminium is more electropositive than Cr, so it displaced chromium from Cr? O?
Cr? O? + Al - (Δ)-> Al? O? + Cr
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