Ncert Solutions Chemistry Class 12th
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2 months agoContributor-Level 10
For the dissociation of K? [Fe (CN)? ]? 4K? + [Fe (CN)? ]? , the number of ions produced (n) is 5.
The degree of dissociation (α) is related to the van't Hoff factor (i) by α = (i-1)/ (n-1).
Given α = 0.4: 0.4 = (i - 1) / (5 - 1) => 1.6 = I - 1 => I = 2.6
Using the depression in freezing point formula (ΔTf = i·Kf·m), and equating the ΔTf for two different solutions:
ΔTf (K? [Fe (CN)? ]) = ΔTf (A)
i? ·Kf·m? = i? ·Kf·m?
(2.6) * [ (18.1 / M) / (100-18.1)/1000] = (1) * [ (w? /M? ) / (W? /1000)]
The problem simplifies to finding the molar mass M of solute A:
2.6 * [18.1 / (M * 81.9)] * 1000 = [w? /M? ] * [1000/W? ]
Assuming the secon
New answer posted
2 months agoContributor-Level 10
3CaO + 2Al → 3Ca + Al? O?
ΔH? = ΣΔH? (Products) - ΣΔH? (Reactants)
ΔH? = [ (0) + (-1675) ] - [ (3 * -635) + (0) ]
ΔH? = -1675 - (-1905) = -1675 + 1905 = 230 kJ
Ans = 230
New answer posted
2 months agoContributor-Level 10
Cr? O? ²? + Fe²? - (H? )-> Cr³? + Fe³?
(n=6) (n=1)
Meq Cr? O? ²? = Meq Fe²?
20 * 0.03 * 6 = 15 * M * 1
M = (20 * 0.03 * 6) / 15 = 0.24 = 24 * 10? ²
Ans = 24
New answer posted
2 months agoContributor-Level 10
P? + 3NaOH + 3H? O → PH? + 3NaH? PO? (A)
Here, NaH? PO? is a reducing agent.
NaH? PO? + AgNO? + H? O → Ag + HNO? + NaH? PO?
Equivalents of NaH? PO? = equivalents of Ag (n-factor of NaH? PO? = 4)
1 mole * 4 = n moles of Ag * 1
So, moles of Ag = 4.
New answer posted
2 months ago
Contributor-Level 10
At the point of intersection in an Ellingham diagram? G for two processes becomes equal, so? G for the reduction becomes zero. A sudden increase in the slope indicates a change in the state of the metal oxide, i.e., from solid to liquid or liquid to vapor.
New answer posted
2 months agoContributor-Level 10
In the ammonolysis process, bond cleavage is carried out in the presence of NH? When a halide compound is treated with NH? , the halide ion (X? ) is substituted by an amino group (NH? ) in a nucleophilic substitution reaction.
New answer posted
2 months ago
Contributor-Level 10
A more reactive carbonyl, i.e., a ketone, is masked with ethylene glycol first in an acidic medium.
New answer posted
2 months agoContributor-Level 10
Allosteric inhibitors are a type of drug-enzyme inhibitor that binds to a site other than the active site of the enzyme, causing a conformational change that affects the active site. The statement in the document incorrectly states they bind at the active site due to steric factors.
New answer posted
2 months agoContributor-Level 10
A divalent metal ion with an atomic number (Z) of 25 is Mn²?
Mn²? (Z=25) has the electronic configuration: 3d? 4s? (n=5, five unpaired electrons).
The magnetic moment (μ) is calculated as: μ = √ [n (n+2)] = √ [5 (5+2)] = √35 = 5.92 BM.
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