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Chemistry Class 12th

Given below are two statements.

Statement I: During electrolytic refining, blister copper deposits precious metals.

Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct answer form the option given below:

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Vishal Baghel

Contributor-Level 10

In electro-refining, impure metal (blister copper) is used as an anode while precious metal like Au, Pt gets deposited as anode mud.

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Chemistry Periodic Table Elements

The correct order of electron gain enthalpies of Cl, F, Te and Po is

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Vishal Baghel

Contributor-Level 10

Element e^- gain enthalpy

F -333

Cl -349

Te -190

Po &nb

...more

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Chemistry Biomolecules

Match List I with List II

List I List II

A. Zymase I. Stomach

B. Diastase

...more

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Vishal Baghel

Contributor-Level 10

Zymase naturally occurs in yeast.

Diastase is found in malt.

Urease is found in soyabean.

Pepsin is found in stomach.

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a year ago

Chemistry Class 12th

The Ksp for bismuth sulphide (Bi₂S₃) is 1.08 * 10^-73. The solubility of Bi₂S₃ in mol L^-1 at 298 K is

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Vishal Baghel

Contributor-Level 10

$B i_{2} S_{3} ? {\underset{2 S}{2 B i}}^{+ 3} + {\underset{3 S}{3 S}}^{- 2}$

$K s p = {(2 S)}^{2} {(3 S)}^{3} = 4 * 27 * {(S)}^{5}$

= 108 (S)5

${(S)}^{5} = \frac{1.08 * 1 0^{- 73}}{108} = 1 0^{- 75}$ $∴ S = 1 0^{- 15} M$

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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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New answer posted

a year ago

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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New answer posted

a year ago

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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