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Chemistry Class 11th

If x = Group number of Europium (atomic number 63)

y = Period number of Americium (atomic number 95)

z = Most stable oxidation state shown by Gadolinium (atomic number 64)

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Vishal Baghel

Contributor-Level 10

Kindly go through the answers

(13.00)

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Chemistry Class 12th

Kindly consider the following figure

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Chemistry Thermodynamics

The only INCORRECT information is

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Vishal Baghel

Contributor-Level 10

q = 0, w = 0, U = 0 = f (V, T)

As volume changes, temperature must change to maintain constant internal energy.

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Chemistry Class 12th

Which reagent can not be used to distinguish t-Butyl alcohol and isopropyl alcohol:

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Vishal Baghel

Contributor-Level 10

Ammonical AgNO₃

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Chemistry Class 11th

If Q is a colourless gas with rotten fish smell then select CORRECT statement.

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Vishal Baghel

Contributor-Level 10

Zero acidic hydrogen present in anionic part of (R)

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Chemistry Class 12th

Nylon-66 is obtained by condensation polymerization of-

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Chemistry Class 12th

Which of the following reduction methods is correctly matched against the given metals (commercial process)?

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Vishal Baghel

Contributor-Level 10

(Cr, Mn) -> Thermite reduction

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Chemistry Equilibrium

An equilibrium mixture contains 2.0 moles of A(g) and 4.0 moles of B(g). Now, 2.0 moles of A(g) is added in this equilibrium mixture and the system is allowed to re-achieve equilibrium at constant volume and temperature. Now, the volume of system is doubled at constant temperature. What should be the moles of B(g) at new equilibrium? The reaction involved is

$A (g) \overset{}{?} 2 B (g)$ .

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Vishal Baghel

Contributor-Level 10

$A (g) ? 2 B (g) .$

$E_{m} \frac{2 m o l}{V l} \frac{4 m o l}{V l}$

$N e w {E_{q}}^{m} \frac{4 - x}{V} \frac{4 + 2 x}{V}$

$V * 2 \frac{4 - x}{2 V} \frac{4 - 2 x}{2 V}$

New Eqm $\frac{4 - x - y}{2 V} \frac{4 + 2 x + 2 y}{2 V}$

= $\frac{4 - Z}{2 V} = \frac{4 + 2 Z}{2 V} (Z = x + y)$

Now, KC = $\frac{^{}}{}$ $\frac{{[B]}^{2}}{[A]} =$ constant

$o r, \frac{{(\frac{4}{V})}^{2}}{(\frac{2}{V})} = \frac{(\frac{4 + 2 Z}{2 V})}{(\frac{4 - Z}{2 V})} \Rightarrow Z = 1.29$

mole of B at new Eqm = 4 + 2Z = 6.58

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Chemistry Biomolecules

Hydrolysis of sucrose into (+) glucose and (-) fructose is known as-

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Vishal Baghel

Contributor-Level 10

Sucrose D (+) glucose + D (-) Fructose

$[α] = + 66.5 ° [α] = + 52.5 ° [α] = - 92.8 °$

Thus rotation changes from positive to negative after hydrolysis. Due to this reason hydrolysis of sucrose is known as inversion and mixture after hydrolysis is known as invert sugar.

Therefore option (B) is correct.

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Chemistry Structure of Atom

A sample of hydrogen atoms de-excites from 6th excited state to the ground state in one or more electronic transitions. If no spectral line is obtained in the Paschen and Brackett series, then the maximum number of spectral lines of different photon energies obtained will be-

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