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Chemistry Thermodynamics

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4K. The ratio of molal elevation constant to molal depression constant (K_b/K_f) is________.

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Vishal Baghel

Contributor-Level 10

$? T_{b} = i K_{b} m$

$? T_{f} = i K_{f} m$

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

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

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Chemistry Class 11th

2.2g of nitrous oxide (N₂O) gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1mL to 167.75mL. The change in thermal energy of the process, $Δ U$ is '-x' J. The value of 'x' is________. [Nearest Integer]

(Given : atomic mass of N = 14 g mol^-1 and of O = 16 g mol^-1.

Molar heat capacity of N₂O is 100 J K^-1 mol^-1)

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Vishal Baghel

Contributor-Level 10

Moles of N₂O $\frac{2.2}{44} = \frac{1}{20}$

$Δ H = n C_{p} Δ T = \frac{1}{20} * 100 (- 40) = - 200 J$

$Δ U = q_{p} + w$

$w = - P_{e x t} . Δ V$

$w = - 1 \frac{(167.75 - 217.1)}{1000} * 101.3 J = + 5 J$

$Δ U = - 200 + 5 = 195 J$

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Chemistry Some Basic Concepts of Chemistry

A box contains 0.90g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0 Torr. When the volume of the box is increased, some of the liquid water evaporates to maintain the equilibrium pressure. If all the liquid water evaporates, then the volume of the box must be________ litre. [Nearest Integer]

(Given : R = 0.082 L atm K^-1 mole^-1)

(Ignore the volume of the liquid water and assume water vapours behave as an ideal gas.)

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Vishal Baghel

Contributor-Level 10

V = $\frac{}{} \frac{}{}$ $\frac{n R T}{P} = \frac{0.90 * 0.0821 * 300}{18 * 32} * 760 = 29.21 ≅ 29$

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Chemistry Class 11th

A white precipitate was formed when BaCl₂ was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

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Vishal Baghel

Contributor-Level 10

$B a C l_{2} + S O_{3}^{2 -} \overset{}{\to} \underset{W h i t e}{B a S O_{3}} ↓ \overset{d i l . H C l}{\to} \underset{\begin{array}{l} b u r n i n g s u l p h u r \\ l i k e s m e l l \end{array}}{S O_{2} ↑}$

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Chemistry Electrochemistry

The mixture of chloroxylenol and terpineol is an example of

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Vishal Baghel

Contributor-Level 10

Antiseptic Dettol is mixture of chloroxylenol and terpineol

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Chemistry Redox Reactions

The structure of protein that is unaffected by heating is

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Vishal Baghel

Contributor-Level 10

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

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Chemistry Class 12th

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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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Chemistry Class 12th

In Friedel-Crafts alkylation of aniline, one gets

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Vishal Baghel

Contributor-Level 10

Aniline show acid-base reaction with AlCl₃

aniline is a Lewis base while AlCl₃ acts as lewis acid.

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Chemistry Biomolecules

Two isomers (A) and (B) with molar mass 184 g/mol and elemental composition C, 52.2%; H. 4.9% and Br 42.9% gave benzoic acid and p-bromobenzoic acid respectively on oxidation with KMnO₄. Isomer 'A' is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO₃. Isomer 'A' and 'B' are respectively