Class 12th

Contributor-Level 10

$Δ T_{b} = i K_{b} m$

$Δ T_{f} = i K_{f} m$

$∴ \frac{4}{4} = \frac{K_{b} * 1.5}{K_{f} * 4.5}$

$\frac{K_{b}}{K_{f}} = 3$

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Class 12th Biomolecules

The number of oxygen's present in a nucleotide formed from a base, that is present only in RNA is_______________.

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Contributor-Level 10

Kindly go through the image

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Compound 'P' on nitration with dil. HNO₃ yields two isomers (A) and (B). These isomers can be separated by steam distillation. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO₃ yields a yellow compound 'C'___________

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Class 12th Chemistry Coordination Compounds

Contributor-Level 10

Intermolecular H- bonding and intra-molecular H- bonding producing compound may be the phenol derivatives.

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The spin only magnetic moment value of an octhahedral complex among CoCl₃.4NH₃, NiCl₂.6H₂O and PtCl₄.2HCl, which upon reaction with excess of AgNO₃ gives 2 moles of AgCl is____________B. M. (Nearest integer)

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Contributor-Level 10

For precipitation of two moles of AgCl

Two Cl^- will produce as a free anion

CoCl₃.4NH₃ -> complex will $[C O {(N H_{3})}_{4} C l_{2}]$ Cl (will not give 2Cl^-)

$P t C l_{4} . 2 H C l \to$ complex will be H₂ [PtCl₆] will not any Cl^-

$N i C l_{2} . 6 H_{2} O \to [N i {(H_{2} O)}_{6}] C l_{2}$ will produce two Cl^- ion.

${[N i {(H_{2} O)}_{6}]}^{+ +} + 2 C l^{-} \to_{A g N O_{3}}^{} 2 A g C l (s)$ precipitate formation

$N i^{2 +} \to [A r] 3 d^{8} 4 s^{0}$

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The mixture of chloroxylenol and terpineol is an example of

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Contributor-Level 10

Antiseptic Dettol is mixture of chloroxylenol and terpineol

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Class 12th Biomolecules

The structure of protein that is unaffected by heating is

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Contributor-Level 10

Primary structure of protein in unaffected by physical or chemical changes.

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The spin- only magnetic moment value of the most basic oxide of vanadium among V₂O₃, V₂O₄ and V₂O₅ is _____________B. M (Nearest integer)

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Class 12th Physics Alternating Current

Contributor-Level 10

Most basic oxide V₂O₃

Here V has +3 O.S. Hence V⁺³ -> $[A r] 3 d^{2}$

two unpaired e^- in d- subshell

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A 110 V, 50Hz, AC source is connected in the circuit (as shown in figure). The current through the resistance $55 Ω,$ at resonance in the circuit, will be__________A.

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Raj Pandey

Contributor-Level 9

At Resonance

X_L = X_C

then l_L = l_C

Now phasor diagram

for L & C

So, Net current = zero

$= (l_{L} + l_{C})$

Therefore current through R circuit at resonance will be zero

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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dacron is an example of polyester polymer.

Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.

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