Chemistry

Contributor-Level 10

∴ % of S in the compound
= (32/233) * (mass of BaSO? / mass of compound) * 100 = (32 * 0.35 * 100) / (233 * 0.25) = 19.227 ≈ 19.23

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3 months ago

For a reaction P → Q, the Ea for the forward reaction and backward reaction is 15KJ/mol and 5KJ/mol, respectively, potential energy of P is 8KJ/mol, then the heat of reaction (in kJ) is:

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New answer posted

3 months ago

6.84gm Al₂(SO₄)₃ is needed to coagulate 2.5 L of As₂S₃ sol completely in 2.0 hrs. The coagulation value of Al₂(SO₄)₃ in terms of millimoles per litre is:

[Atomic Mass : Al = 27, S = 32].

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Chemistry Chemistry Chemical Kinetics

Contributor-Level 10

Kindly go through the solution

Ans. (8.00)

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3 months ago

The incorrect statement for lyophilic colloids is

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Contributor-Level 10

Factual on lyophilic colloids
(A) It is easy to prepare
(B) Stable
(C) Revisable
(D) Viscosity is high and surface tension is low for DP. and DM.

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3 months ago

An ionic compound (A⁺B^-) crystallizes in rock salt structure. If the ionic radii of A⁺ and B^- is 200pm and 400pm respectively, then calculate distance between nearest anions in Å.

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Contributor-Level 10

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Ans. (8.40 to 8.57)

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3 months ago

The correct statement is:

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Contributor-Level 10

Factual
(A) Magnalium contain Al and Mg
(B) Bell metal ⇒ Cu and Sn
(C) Gun metal ⇒ Cu, Sn and Zn
(D) Chrome steel ⇒ Fe and Cr.

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3 months ago

Chemistry Class 11th

The Lanthanoid that does not show +2 oxidation states is:

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Chemistry Chemistry Organic Chemistry

Contributor-Level 10

Sm ⇒ +2, +3 (4f? , 6 s²); Gd ⇒ +3 (4f?5 d¹6 s²)
Tm ⇒ +2 + 3 (4f¹³,6 s²); Nd ⇒ +2, +3, +4 (4f? , 6 s²)

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3 months ago

What is the molecular weight of the final product in the following reaction sequence

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Contributor-Level 10

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Ans. (122.00)

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3 months ago

Chemistry Class 11th

Total number of species in which atleast one atom have same hybridization as in central atom of azide ion.

N₂O, C₂H₂, CO₂, C₃O₂, BeF₂, NO₂, PF₃

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Contributor-Level 10

$N_{2} O, C_{2} H_{2}, C O_{2}, C_{3} O_{2}, B e F_{2}$

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3 months ago

In white phosphorous (P₄) if x is total number of triangle y is total number of plane of symmetry z is total number of P-P bond then calculate value of $\frac{(y + z)}{x} .$

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