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Chemistry Solutions

Solute A associate in water. When 0.7g of solute A is dissolved in 42.0g of water it depresses the freezing point by $0.2 ° C$ . The percentage association of solute A in water, is

[Given: Molar mass of A = 93 g mol^-1. Molal depression constant of water is 1.86 K kg mol^-1.]

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Vishal Baghel

Contributor-Level 10

$Δ T_{f} = 0.2 ° C$

$m = \frac{0.7 * 1000}{93 * 42} = \frac{700}{93 * 42} = 0.179 m$

$Δ T_{f} = i K_{f} m$

$i = \frac{Δ T_{f}}{K_{f} * m} = \frac{0.2}{1.86 * 0.179} = 0.6$

$\frac{α}{2} = 1 - 0.6 = 0.4$

$∴ α = 0.4 * 2 = 0.8$

% of = 80%

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Chemistry Thermodynamics

At $25 ° C$ and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are -3268 kJ mol^-1 and -1300 kJ mol^-1, respectively. The change in enthalpy for the reaction 3C₂H₃(g) ® C₆H₆(I), is

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Vishal Baghel

Contributor-Level 10

$Δ H = 3 {(Δ H_{c o m b})}_{C_{2} H_{2} (g)} - {(Δ H_{c o m b})}_{C_{6} H_{6} (l)}$

$= - 1300 * 3 - (- 3268) k J / m o l e$

$= (- 3900 + 3268) k J / m o l e$

$= - 632 k J / m o l e$

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Chemistry Dual Nature of Radiation and Matter

The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is:

[Given: The threshold frequency of platinum is 1.3 * 10¹⁵s^-¹ and h = 6.6 * 10^-³⁴ J s.]

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Vishal Baghel

Contributor-Level 10

$?_{0} = h υ_{0}$

$= 6.6 * 1 0^{- 34} * 1.3 * 1 0^{15} J$

$= 8.58 * 1 0^{- 19} J$

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Chemistry Class 12th

Given below are two statements:

Statement I: On heating with KHSO₄, glycerol is dehydrated and acrolein is formed.

Statement II: Acrolein has fruity odour and can be used to test glycerol's presence.

Choose the correct option.

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Vishal Baghel

Contributor-Level 10

$G l y c e r o l \to_{Δ}^{K H S O_{4}} \underset{(P u n g e s t, s u f f o c a t i n g o d o u r)}{A c r o l e i n}$

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Chemistry Class 12th

Drugs used to bind to receptors inhibiting its natural function and blocking a message are called:

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Vishal Baghel

Contributor-Level 10

Based upon properties of drugs.

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Chemistry Biomolecules

During the denaturation of proteins, which of these structure will remain intact?

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Vishal Baghel

Contributor-Level 10

During denature of protein, 1° structure remains the same, whereas 2° and 3° structure get destroyed.

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Chemistry Class 12th

Melamine polymer is formed by the condensation of:

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Vishal Baghel

Contributor-Level 10

Melamine + formaldehyde -> Melamine formaldehyde polymer

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Chemistry Class 12th

An organic compound 'A' on reaction with NH₃ followed by heating gives compound B. Which on further strong heating gives compound C(C₈H₅NO₂). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is: