Class 12th

For the cell Cu(s) | Cu²⁺ (aq)(0.1M) Ag⁺ (aq)(0.01M) | Ag(s)
The cell potential E₁ = 0.3095V
For the cell Cu(s) | Cu²⁺ (aq)(0.01M) Ag⁺ (aq)(0.001M) | Ag(s)
The cell potential = _____ *10⁻² V. (Round off to the Nearest Integer).
[Use : (2.303RT/F) = 0.059 ]

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E_cell = E? _cell - (0.059/2)log { [Cu²? ]/ [Ag? ]²}
E? = E? _cell - (0.059/2)log [0.1/ (0.01)²] = 0.3095
E? _cell = 0.3095 + 0.0885 V
E? _cell = 0.398

Again, E? = E? _cell - (0.059/2)log [10? ²/ (10? ³)²]
E? = 0.398 - (0.059/2) x 4 V

E? = 0.28 V
E? = 28 x 10? ² V

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9 months ago

Class 12th Biomolecules

The total number of stereoisomers in open-chain aldohexose (such as glucose) is :

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1. The number of chiral carbons in open-chain aldohexose (such as glucose) is four, therefore, the number of stereoisomers? 2? 16.

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9 months ago

Class 12th Physics

2SO₂(g) + O₂(g) → 2SO₃(g)
The above reaction is carried out in a vessel starting with partial pressure Pso₂ = 250 m bar, Po₂ = 750 m bar and Pso₃ = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is _____ m bar. (Round off to the Nearest Integer).

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2SO? (g) + O? (g)? 2SO? (g)
t=0: 250 m bar 750 m bar -
0 625 m bar 2 x 250 = 500
P_total = 625 + 250m bar
= 875mbar

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9 months ago

Class 12th Biomolecules

The oxidation number of phosphorus in ATP (adenosine triphosphate) is :

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ATP has phosphate group, PO? ³?
So x + 4 (-2) = - 3 or x = + 5

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For the first order reaction A → 2B, 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is _____ min. (Round off to the Nearest Integer).
[Use : ln2 = 0.69, ln 10 = 2.3 Properties of logarithms : ln x? = y ln x; ln(x/y) = lnx – lny ]

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A → 2B
t = 0: 1 mole 0
after 100 min: (1 - 0.1) mol 0.2 mol
K = (1/t)ln [a/ (a-n)]
K = (2.303/100)log (1/0.9) min? ¹
0.693/t? /? = (2.303/100) [log10 - log9] = (2.303/100) x 0.046
t? /? = 69.3 / (2.303 x 0.046) = 654.15 min
Ans. = 654 (the nearest integer)

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Class 12th Solutions

In a solvent 50% of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____ *10⁻². (Round off to the Nearest Integer).

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i = total no. of particles after dissociation/association / total no. of particle before dissociation/association
HA? H? + A? (Dissociation)
0.5a
2HA → (HA)? (Association)
0.5a/2
i = (a + 0.25a)/a = 125 x 10? ²
Ans. = 125

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Percentage packing fraction of diamond is x (approximately), and the number of particle per unit cell is y. Then the value of x + y is

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Class 12th Coordination Compounds

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Percentage packing fraction of diamond is 34% and number of particle per unit cell is 8.

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Out of following the number of complexes which are diamagnetic is / are
(i) [Co(H₂O)₆]Cl₃
(ii) [Co(NH₃)₆]Cl₂
(iii) [Fe(CO)₅]
(iv) [Ni(NH₃)₆]²⁺
(v) K₂[NiF₆]
(vi) K₂[PtCl₄]
(vii) Na₂[ZnCl₄]

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[Co (NH? )? ]Cl? and [Ni (NH? )? ]²? are paramagnetic.

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If X metal atoms occupying the corners, Y atom at cube centre and Z atoms at the centres of the edges, then if the co-ordination number of X w.r.t. Z is a and that of Y w.r.t. Z is b, then the value a + b is

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Coordination no.

X 6
Y 12

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Consider the above reaction, and choose the correct statement:

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